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Phase 1. Where to start
Why this course exists and who it fits: the problem it solves, how phases, tests and trainers work, and how to go through it without dropping off.
- Зачем этот курс required
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Phase 2. Language basics: Java · 100 questions
Syntax and types, OOP, collections, generics, exceptions, lambdas and Stream API, modern Java, tooling — language foundations before frameworks.
- Java Syntax and Types: Where the Code Begins required
- OOP in Java: classes, inheritance, interfaces, record and enum required
- Java Collections: Lists, Sets and Maps required
- How HashMap Works Inside required
- Generics in Java: type safety without casting required
- Exceptions in Java: hierarchy, checked/unchecked, try-with-resources required
- Lambdas and the Stream API in Java required
- Records, Optional, and modern Java required hands-on code
- Загрузка классов
- Garbage Collection in Java required
- Java Tooling: JDK, javac, jar, Maven and Gradle
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 3. Algorithms and data structures · 118 questions
Arrays and Big-O, sorting, stacks and queues, lists, recursion, trees, hash tables, heaps and graphs — the foundation under collections, indexes and stores.
- Why data structures and algorithms matter
- Math behind big O: logarithms, powers and growth rates required
- Arrays and binary search: big-O notation, ArrayList and Arrays.binarySearch required
- Simple sorting: bubble, selection, insertion
- Stacks and queues: LIFO, FIFO, circular queue and ArrayDeque
- Linked Lists: Nodes, References and Why LinkedList Loses to ArrayList
- Recursion: base case, call stack and divide and conquer required
- Advanced sorting: Shell sort, quicksort and radix sort
- Binary search trees: the rule, traversal, deletion and TreeMap required
- Red-black trees: rotations, recoloring and TreeMap
- 2-3-4 trees and B-trees: multi-key nodes and database indexes
- Hash tables: hash function, collisions and load factor required
- Heaps: weak ordering, sift up and sift down, PriorityQueue
- Graphs: vertices, edges, DFS and BFS
- Weighted graphs: minimum spanning tree and shortest path
- Two pointers and the sliding window required
- Prefix sums: a range sum as the difference of two numbers
- Binary search on the answer: monotonicity, bounds and the loop invariant
- Monotonic stack: next greater element in a single pass
- Dynamic programming: overlapping subproblems, memoisation and tables
- Backtracking: the search tree, undoing state, pruning dead branches
- Choosing a data structure: array, list, tree or hash table required
- Хвостовая латентность
- Горячий путь
- Order book
- Маркет-дата
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 4. Git and branching models · 46 questions
Snapshots and commits, branches and merging, push/pull, pull requests and code review, rebase and reflog, branching models from Git Flow to trunk-based.
- What Git is and why everyone needs it required
- Commits and history: add, commit, log, and .gitignore
- Branches and merging: merge and conflicts required
- Remote repositories: push, pull, and fetch required
- Pull requests and code review required
- Rebase and cherry-pick: rewriting history
- Undo and recovery: reset, revert, reflog
- Branching models: Git Flow, GitHub Flow, trunk-based
- Phase test in the cabinet
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Phase 5. Foundation: Spring core · 55 questions
DI/IoC, bean lifecycle, Boot, MVC, Data JPA, transactions, events, AOP, scheduler.
- Spring DI/IoC, bean lifecycle, and scopes required
- Spring Bean Lifecycle with Examples required
- Spring Boot auto-configuration, properties, profiles required
- Spring MVC: Controllers, REST, Validation and Error Handling required
- @Transactional in Spring: transactions, propagation, pitfalls required hands-on code
- Spring Data JPA: repositories, query methods, projections, N+1 required hands-on code
- Spring Events: @EventListener, @TransactionalEventListener, asynchronous events required
- Spring AOP: aspects, proxies and why @Transactional sometimes stays silent required
- Spring WebFlux: when to use it, Mono/Flux, R2DBC
- Spring Scheduled, Async, virtual threads
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 6. Multithreading and concurrency · 71 questions
Threads and the Java memory model (JMM, happens-before, volatile), race conditions, synchronized and explicit locks, atomics and CAS, thread-safe collections, thread pools, CompletableFuture, Java 21 virtual threads, and common bugs — deadlock, livelock, starvation.
- Threads and Processes in Java required
- Java Memory Model (JMM): Visibility and happens-before required
- Races in multithreaded programs: race condition and data race required hands-on code
- synchronized and monitors: mutual exclusion in Java required
- Explicit Locks: Lock and ReentrantLock required
- Atomic Variables and CAS in Java required
- Thread-Safe Collections in Java required
- Thread Pools: ExecutorService required
- CompletableFuture: Asynchronous Tasks in Java required
- Virtual Threads in Java 21 required
- Structured Concurrency: StructuredTaskScope
- Deadlock, livelock, and starvation: when threads get in each other's way required
- Concurrency in practice: Spring
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 7. Design principles and patterns · 27 questions
SOLID, GRASP, GoF patterns, DRY/KISS/YAGNI.
- SOLID: five principles of design required
- GoF Patterns: All 23 in Plain Words required
- GRASP: Assigning Responsibilities
- DRY, KISS, YAGNI and other engineering principles required
- Clean Code: names, functions, comments
- Low level design interview: solving design-in-code tasks
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 8. SQL from scratch · 67 questions
The query language before any particular database: tables and keys, SELECT and WHERE, joins, aggregates, NULL, subqueries, window functions, dates and strings, modifying data, creating tables and why a query suddenly got slow.
- What a Database and Tables Are
- SELECT: Pick, Filter, Sort required
- JOIN: Combine Data from Several Tables required
- Aggregates: COUNT, GROUP BY and HAVING required
- NULL and Data Types: Where Everyone Stumbles required
- Subqueries and CTEs: A Query Inside a Query required
- Window Functions: Counting Without Collapsing Rows required
- Даты и время
- Строки
- INSERT, UPDATE, DELETE and Transactions
- Database Schema: Tables, Keys and Views required
- Why a Query Is Slow: Indexes on Your Fingers required
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 9. PostgreSQL: model and queries · 99 questions
Transactions and isolation, locking, data types, indexes and EXPLAIN.
- ACID and Transaction Isolation Levels in PostgreSQL required hands-on code
- Transaction Isolation Levels in PostgreSQL required
- Spring @Transactional: how transactions work and where they break required
- Locks in PostgreSQL: SELECT FOR UPDATE, SKIP LOCKED and advisory locks required hands-on code
- Naming Objects in PostgreSQL — snake_case, Singular, Prefixes
- Numbers in PostgreSQL: bigint, numeric, boolean and how not to lose money
- String types in PostgreSQL: text, varchar, and char
- Time and Time Zones in PostgreSQL — Why timestamptz and How to Work With It
- UUID in PostgreSQL: the uuid type, v7 vs v4, bigint vs UUID
- Enumerations in PostgreSQL: ENUM, lookup table, or CHECK
- JSONB in PostgreSQL — what it is, how it works, and when to use it
- Arrays and range types in PostgreSQL: tags, bookings, EXCLUDE
- PostgreSQL Index Types — B-tree, GIN, GiST, BRIN required hands-on code
- PostgreSQL Composite Indexes and the Leftmost Prefix Rule required
- Covering Index in PostgreSQL: why you need INCLUDE required
- How to Choose an Index and Estimate Selectivity in PostgreSQL required
- Weights in PostgreSQL full-text search
- EXPLAIN ANALYZE — how to read a PostgreSQL query plan required
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 10. PostgreSQL: operations and scale · 92 questions
Migrations, connection pool, vacuum/WAL, replication, backup, partitioning, FTS and geo.
- PostgreSQL migrations with zero downtime required
- Connection pooling in PostgreSQL — HikariCP, PgBouncer and the Wooldridge formula required
- VACUUM, autovacuum and bloat in PostgreSQL required
- WAL in PostgreSQL: what it is and how to control the journal size required
- PostgreSQL replication: read-replica and query routing required
- PostgreSQL Backups: pg_dump, pg_basebackup and PITR
- Partitioning in PostgreSQL: when you need it and how it works required
- Partitioning and Sharding in PostgreSQL
- Multi-tenancy in PostgreSQL: row, schema, db per tenant
- Materialized views in PostgreSQL: how they work and when to use them
- PostgreSQL Triggers and Stored Procedures
- PostgreSQL Extensions: pg_trgm, pgcrypto, pg_stat_statements and Others
- Full-text search in PostgreSQL — tsvector, GIN, russian
- PostGIS: geodata in PostgreSQL — points, polygons, radius search
- Anonymizing a PostgreSQL Dump for a Developer
- Common Mistakes When Choosing Types in PostgreSQL
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 11. Hibernate and ORM · 59 questions
Object-relational mapping: mapping entities and associations, persistence context, lazy loading and N+1, JPQL and Criteria, caching, transactions and locking, inheritance and common pitfalls.
- What ORM and Hibernate Are: From JDBC to Object-Relational Mapping required
- Entity Mapping in Hibernate and JPA required
- Entity Associations in Hibernate: @OneToMany, @ManyToOne, @ManyToMany required
- Persistence context and entity states in Hibernate required
- Lazy and Eager Loading in Hibernate required
- The N+1 Query Problem in Hibernate required
- JPQL, Criteria API, and Native Queries in Hibernate
- Caching in Hibernate: first-level, second-level and query cache
- Transactions, flush, and locking in Hibernate required hands-on code
- Entity Inheritance in Hibernate: SINGLE_TABLE, JOINED, TABLE_PER_CLASS
- Common Hibernate mistakes: what goes wrong and how to fix it required
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 12. Other stores: documents, search, files, analytics · 227 questions
First the foundations — storage engines, replication, sharding, streams. Then the stores themselves: MongoDB, Elasticsearch, object storage (S3) and ClickHouse.
- B-trees and LSM-trees in plain words: how a database stores data required
- OLTP and OLAP in plain words: two different worlds of working with data required
- Schema evolution in plain words: changing data formats without breaking anything
- Replication models in plain words: why a replica lags, multi-leader, and quorums required
- Partitioning (sharding) in plain words: slicing data across nodes without a hot spot required
- System of record and derived data in plain words: why a cache, an index, and a read model are the same thing
- Stream processing in plain words: change data capture (CDC) and time in streams
- ACID, read and write concerns, transactions in MongoDB required
- Document modeling in MongoDB: embed vs reference, indexes
- Replication and Sharding in MongoDB
- Elasticsearch: how a search engine works required
- How Queries Work in Elasticsearch and Why Documents Are Ranked the Way They Are
- Spring Data Elasticsearch: how to connect and use search in a Java application
- How Elasticsearch works in production: ILM, snapshots, sizing, monitoring
- What object storage is: bucket, object, key, storage classes and presigned URL hands-on code
- Spring + AWS SDK v2 for S3: integration, patterns, MinIO hands-on code
- S3 in production: backups, replication, cost, and monitoring
- What is Redis: an in-memory store for backend developers required
- Redis data structures: String, Hash, List, Set, Sorted Set and more required
- Caching Patterns in Redis required hands-on code
- Redis Is Not Just for Caching: Locks, Rate Limiting, Queues and Pub/Sub required
- Redis in Spring Boot: RedisTemplate, @Cacheable and Spring Session
- Operating Redis: persistence, memory, replication required
- How ClickHouse Works: Columnar Storage, MergeTree, and OLAP
- ClickHouse: schema modeling, queries, materialized views
- ClickHouse from Java and Spring Boot: connecting, writing, and reading
- ClickHouse in production: replication, TTL, backups and monitoring
- Cassandra Architecture: a Ring With No Leader Node
- Cassandra Data Model: Partition Key and Clustering Columns
- Consistency and Replication in Cassandra: Tunable per Request
- How Neo4j Works: the Property Graph, Nodes, Relationships and Index-Free Traversal
- Cypher: a Graph Query Language in Plain Words
- Neo4j graph modeling: indexes, supernodes and operations
- PostgreSQL or MongoDB: how to choose a database
- Oracle or PostgreSQL: differences and migration
- Cassandra, PostgreSQL or MongoDB: when to reach for a wide-column NoSQL
- Graph data in plain words: recursive SQL or a graph database
- Neo4j: применение
- PostgreSQL or ClickHouse: when to add a second database
- Search: PostgreSQL FTS or Elasticsearch
- Files: in the database or in object storage
- Как выбрать базу данных
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 13. Networking fundamentals · 83 questions
OSI and TCP/IP models, IP and ports, TCP/UDP, DNS, HTTP and HTTPS, HTTP versions, connections and reliability.
- How Networking Works: The OSI and TCP/IP Models required
- IP Addresses, Ports, and NAT
- TCP and UDP: Reliability vs Speed required
- DNS: How a Domain Name Turns Into an Address required
- HTTP: Methods, Status Codes, Headers required
- HTTPS and TLS: Encryption and the Handshake required
- HTTP/1.1, HTTP/2, and HTTP/3: What Changed
- Connections: Keep-Alive, Pools, and Timeouts
- Два пула: БД и HTTP
- Load Balancers and Reverse Proxies required
- Networking and Reliability: Timeouts, Retries, Idempotency
- Диагностика сети
- Linux for Backend Developers: Processes, Signals, Files and Memory
- WebSocket, SSE and long polling required
- WebSocket: много подов
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 14. API: REST and contracts · 115 questions
URLs and resources, query parameters, responses and errors, versioning, OpenAPI.
- REST URLs and resources: how to name paths and pick HTTP methods required
- Query Parameters and Pagination in a REST API hands-on code
- JSON and Response Format in REST API
- Errors in REST API — the Problem Details format required hands-on code
- HTTP Headers in REST API: Content-Type, Authorization, Idempotency-Key, and Tracing required
- REST API versioning — how to change an API without breaking clients required
- Alias segments and action endpoints in REST API
- API-first and contract-first: design the contract before the code required
- OpenAPI: metadata and common mistakes in REST
- Rate limiting, file upload and deprecation in REST API
- Batch operations, async, and localization in REST API
- gRPC: Fast Calls Between Services required
- GraphQL: The Client Asks for Exactly What It Needs required
- HATEOAS: REST Maturity and Hyperlinks
- Where to Validate Data required hands-on code
- Bean Validation in Spring: @NotNull, @Valid and MethodArgumentNotValidException
- Custom Constraints and Error Messages
- Application error model required hands-on code
- A single error handler
- Common Pitfalls in Exception Handling
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 15. Security and authorization · 161 questions
Spring Security, Keycloak/OAuth2/OIDC and authorization patterns.
- Spring Security: filters, AuthN, AuthZ, OAuth2 required
- What Keycloak Is and Why You Need It
- OAuth2 and OIDC in plain words required
- Realm, client, roles and users in Keycloak
- Authorization Code Flow and PKCE Step by Step required
- Keycloak and Spring Security: validating tokens required hands-on code
- Roles and Access: RBAC and ABAC with Keycloak required
- Three Keycloak tokens: access, id, refresh — which goes where required
- Kerberos and LDAP: Enterprise Authentication
- Authentication and authorization patterns
- Where Each Check Belongs — Gateway, BFF, and Domain Service required
- ABAC and resource ownership checks in Spring
- Service-to-service authentication: mTLS and Client Credentials
- PII and secrets — how not to leak them into logs, responses, and messages required
- Auditing administrator actions
- PCI DSS for developers
- GDPR for Developers
- Backend vulnerabilities
- Инъекции
- SSRF
- IDOR и BOLA
- Mass assignment и лишние поля
- Обход пути и загрузки
- XXE и десериализация
- Подбор паролей и лимиты
- Редирект, CSRF и CORS
- Гонки и двойное списание
- Ошибки с JWT
- Как искать уязвимости
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 16. Brokers and distributed systems · 68 questions
AMQP/RabbitMQ, Kafka and distributed patterns: saga, outbox, idempotency.
- The AMQP protocol: exchange, queue, binding, ack required
- RabbitMQ in production: clustering, queue types and monitoring
- Spring AMQP: sending and receiving messages through RabbitMQ
- Messaging Patterns with AMQP
- NATS messaging: subjects, queue groups and JetStream explained
- NATS vs RabbitMQ vs Kafka: choosing a message broker
- Apache Kafka: topics, partitions, ordering and guarantees required hands-on code
- Kafka in production: Spring Kafka, DLQ, Schema Registry, tuning, security required hands-on code
- Kafka Streams: stream processing
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 17. Microservices: architecture and pitfalls · 54 questions
Whether you need microservices, how a service is structured and how they communicate; what breaks in a distributed system and how to fix it — saga, outbox, idempotency, resilience.
- Choosing your starting architecture: monolith, modular monolith, microservices required hands-on code
- Structural Patterns for Microservices required hands-on code
- Between services: synchronous call or events required
- The trouble with distributed systems in plain words: partial failures, unreliable clocks, truth by quorum required
- Consistency and consensus in plain words: linearizability, CAP, and one shared problem required
- Correctness in a distributed system in plain words: the end-to-end argument, exactly-once, integrity versus timeliness required
- Distributed patterns: data consistency across services required hands-on code
- Resilience Patterns: Retry, Circuit Breaker, Bulkhead, DLQ required hands-on code
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 18. Containers: Docker · 62 questions
Containers and images, Dockerfile for Spring Boot, multi-stage builds, running containers, volumes and data, networking, Docker Compose, the JVM in a container, secure images and registries.
- What Docker and Containers Are required
- Images, layers and the Dockerfile: how Docker packages an application required
- Dockerfile for Spring Boot: building the image the right way required hands-on code
- Docker Multi-Stage Builds and Layer Caching required
- Running containers: docker run and the lifecycle
- Volumes and data in Docker: how not to lose your database when a container restarts
- Docker Networking: How Containers Talk to Each Other
- Docker Compose: bring up your whole environment with one command required
- JVM in a container: memory and cores required
- Small and Secure Docker Images
- Image Registries and Building in CI
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 19. Kubernetes and graceful shutdown · 95 questions
Cluster, networking, Spring Boot on Kubernetes, deployment and graceful shutdown.
- Kubernetes: pod, deployment, service — where to start required
- Networking in Kubernetes: Service, DNS, Ingress, NetworkPolicy required
- Spring Boot on Kubernetes: probes, resources and the JVM, graceful shutdown required hands-on code
- Конфигурация на лету
- Deploying to Kubernetes: manifests, Helm, rolling update, GitOps required
- Kubernetes in practice: debugging pods and kubectl commands required
- OpenShift: How It Differs from Vanilla Kubernetes
- Helm
- Argo CD
- Graceful shutdown in Spring Boot: server.shutdown, timeouts, and health probes
- HTTP drain — preStop sleep and long-running endpoints required
- Database and persistence during Spring Boot shutdown
- Scheduled, @Async, and outbox: how to stop background tasks correctly
- Kafka shutdown — how to stop the consumer and producer correctly
- Idempotency during service shutdown
- Kubernetes and graceful shutdown: terminationGracePeriodSeconds, probes, maxSurge required
- Shutdown budgets and graceful shutdown observability
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 20. Clouds · 298 questions
Cloud principles and three providers — AWS, Azure and GCP: networking, IAM, compute, scaling, serverless, data, storage and IaC. One model, knowledge transfers between clouds.
- Что такое облако required
- Регионы и зоны
- Учётные записи и права
- Сеть
- Вычисления required
- Управляемые данные required
- Наблюдаемость и секреты
- Деньги
- Отказоустойчивость
- AWS Fundamentals: Accounts, IAM, Regions, and VPC
- Networking in AWS: VPC, subnets, NAT and security groups
- IAM in AWS: Users, Roles, and Policies
- Where to run a service in AWS: EC2, ECS, EKS or Lambda
- Scaling and Availability in AWS
- Serverless on AWS: Lambda, events, cold start, API Gateway
- Managed Data in AWS: RDS, ElastiCache, SQS, MSK
- DynamoDB: keys, indexes, and when to pick it over SQL
- AWS from Spring Boot: SDK v2, the credentials chain and LocalStack
- Security and observability in AWS: Secrets Manager, SSM, KMS, CloudWatch
- Resilience and Disaster Recovery in AWS
- AWS cost optimization: where to start
- AWS Well-Architected Framework: six pillars and how to use them
- Infrastructure as Code: the basics
- Terraform: HCL, Providers, State, and Modules
- CloudFormation: Templates and Stacks
- AWS CDK: infrastructure as a program
- IaC in Practice: State, Secrets, Delivery
- Основы
- Сеть
- Entra ID и RBAC
- Где запускать сервис
- Масштабирование и доступность
- Serverless
- Управляемые данные
- Cosmos DB
- Blob Storage
- Из приложения
- Безопасность и наблюдаемость
- Оптимизация затрат
- Отказоустойчивость и DR
- Инфраструктура как код
- Основы
- Сеть
- Cloud IAM
- Где запускать сервис
- Масштабирование и доступность
- Serverless
- Управляемые данные
- Firestore и NoSQL
- Cloud Storage
- Из приложения
- Безопасность и наблюдаемость
- Оптимизация затрат
- Отказоустойчивость и DR
- Terraform
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 21. CI/CD: the delivery pipeline · 30 questions
Pipeline principles, CI for Java, release strategies and branching.
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Phase 22. Quality: test strategy · 34 questions
The test pyramid, slices and integration tests, mocks and external services, load testing.
- Spring Testing: @SpringBootTest, slices, TestContainers required hands-on code
- The test pyramid: what goes where required
- Integration Tests with Testcontainers required
- Mocks and External Systems in Tests required
- Load testing: k6, Gatling, JMeter
- Phase test in the cabinet
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Phase 23. Observability and diagnostics · 83 questions
How to see what a running system is doing: logs, metrics, tracing, context propagation, health checks, SLOs and alerts — plus database diagnostics and the incident review afterwards.
- Spring Actuator, Micrometer, tracing hands-on code
- Logging in Java and Spring Boot: JSON, MDC and Log Levels required
- Metrics in Spring Boot: Micrometer and Prometheus required
- Distributed tracing in Java: OpenTelemetry, spans, and how to link logs with traces required
- Context propagation and MDC in Spring Boot
- Health checks in Spring Boot: liveness, readiness and custom HealthIndicator
- SLO and Alerts in Java/Spring Boot
- Observability configuration in Spring Boot hands-on code
- Профилирование и утечки required
- Thread dump и heap dump required
- От алерта до строки лога required
- PostgreSQL monitoring: slow queries, activity, and key metrics required
- Отчёт нагрузки (pg_profile)
- Запросы для отчёта нагрузки
- Постмортем и дежурства required
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 24. Working with AI agents · 65 questions
How a language model works and how to write code productively with an AI agent: tokens and hallucinations, context, tool calling, agents, the working loop, reviewing and accepting AI code.
- How AI Models Work: Predicting the Next Token
- AI Hallucinations: Why the Model Confidently Makes Things Up
- Tokens and Cost: What You Pay For When Working With AI
- Context: What the Model Holds in Mind at Once
- Tool Calling: How the Model Reaches Beyond Text hands-on code
- Agents: A Model in a Loop with Tools and a Goal hands-on code
- Working with Agents: The Basic Loop of a Productive Session
- Команды Claude Code
- Spec-driven development
- Reviewing and Testing Code with an Agent
- Accepting AI output: acceptance criteria and tests from the spec
- AI PDLC и MCP
- Phase test in the cabinet
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Phase 25. Building LLM applications · 67 questions
How to embed AI into a backend product: what an LLM feature is made of, orchestration with LangChain, RAG and embeddings, vector databases, and agent applications.
- What an LLM feature is made of hands-on code
- LangChain: orchestrating LLM applications
- RAG and embeddings: giving the model your data hands-on code
- Vector databases hands-on code
- Agent applications: tools and autonomous loops hands-on code
- Multi-agent systems: six agent orchestration patterns
- Evaluating AI agents: trajectory tests, rubrics and regressions
- AI agent memory: session state, long-term memory and what to store
- AI agent security: permissions, identity and trust levels
- Инъекция в промпт
- Вывод модели как недоверенный ввод
- Безопасность RAG
- Утечки через модель
- Расход и полномочия модели
- Agents in production: MCP and A2A protocols, deployment and tracing
- Phase test in the cabinet
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Phase 26. System design and architectural choices · 94 questions
The design method, building blocks, storage and notation choices, C4.
- Reliability, scalability, maintainability — in plain words required
- The system design method: from requirements to architecture required
- Building Blocks of System Design required
- How a Notification System Works: Architecture From Scratch
- How to write and defend a system design: design doc, C4, review
- Spring MVC, WebFlux and virtual threads: which to choose
- ADR: how to record architecture decisions required
- The Architect's Role in a Development Team
- C4 model
- Spring Cloud or Kubernetes
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 27. Domain-Driven Design · 42 questions
Strategic and tactical DDD patterns, aggregates, domain events.
- What DDD Is and Why You Need It required hands-on code
- Strategic DDD Patterns required
- DDD Tactical Patterns required
- DDD Integration Patterns required
- Design Principles in DDD
- Ontology and the domain model: a system of concepts before aggregates
- Event Storming: extracting the domain model from the business
- Phase test in the cabinet
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Phase 28. Service architecture patterns · 118 questions
Service and microservice structure, Onion and Hexagonal, CQRS, resilience and batch processing.
- Onion Architecture required
- CQRS
- When to use CQRS: from simple markers to separate databases required
- The command side in CQRS — how writes work required
- Query side in CQRS: reading data without write tools
- Read model in CQRS — a denormalized projection for fast reads
- Syncing the read-model through events: outbox, Kafka, and the idempotent consumer
- CQRS Maturity Level and Evolution — From Simple Split to Event-Driven Read Model
- Hexagonal architecture hands-on code
- When to Use Hexagonal Architecture required
- The Core Layer in Hexagonal Architecture required
- Ports in Hexagonal Architecture — interfaces in core/ required
- Inbound Adapters in Hexagonal Architecture — REST, Kafka, CLI
- Outbound Adapters in Hexagonal Architecture — How a Service Talks to the Outside World
- Module Structure in Hexagonal Architecture
- Bootstrap / Composition Root in Hexagonal
- Architecture Tests in a Hexagonal Project with ArchUnit
- Batch Data Processing: How Not to Break Your Background Worker
- Event Sourcing: Store Events, Not State
- Что это и когда нужны hands-on code
- Реализация в Java hands-on code
- BPM и Camunda
- Mock interview in the cabinet
- Phase test in the cabinet
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Phase 29. Development methodologies and process · 41 questions
Waterfall, Agile, Scrum, Kanban, XP, estimation and scaling — how a team organizes work from idea to release.
- Development Models: From Waterfall to Agile
- Scrum: Roles, Events, and Artifacts required
- Kanban: Flow, WIP Limits, and Pull required
- Extreme Programming: the Engineering Practices of Agile
- Estimation and planning: story points and velocity
- Scaling Agile: SAFe and LeSS
- A Methodology for AI: Use Case Pattern and Other Ways
- Phase test in the cabinet
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Phase 30. Kotlin for the Java developer · 39 questions
A second JVM language: syntax and idioms, null-safety, data and sealed classes, extension functions, coroutines vs virtual threads, and Spring Boot with Kotlin. Optional phase.
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Phase 31. The product engineer: role and practice · 81 questions
The whole role: start from the user problem, outcome metrics and end-to-end ownership — plus working with an AI agent, the domain model and the path from slice to contract.
- Who a Product Engineer Is: The Role and the Work Cycle
- The Problem, Not the Solution
- Contact with the User
- Outcome Metrics, Not Output Metrics
- Prioritization: the smallest valuable slice
- Ownership from idea to user
- Shipping and the Metrics Loop, Solo hands-on code
- AI as the product engineer's leverage
- Configuring an agent for your project: rules, memory, tools
- Which Programming Language to Choose for AI Coding
- Daily work with an agent: understand, build, fix
- How to Review Code Written by AI
- Executable agent rules vs SonarQube vs ESLint vs tech lead review
- The language of the domain: concepts, glossary, knowledge graph
- From a conceptual model to a contract an agent executes
- Phase test in the cabinet
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Phase 32. Use Case Pattern and the end-to-end case · 66 questions
The culmination: the Use Case Pattern methodology — designing a service from the business task, the Use Case spec, maturity levels 0–3 — and the end-to-end marketplace case that ties the whole path together.
- Use Case Pattern
- Use Case Pattern: a step-by-step guide
- Use Case specification: the format
- Maturity level 0: a snapshot of existing code
- Maturity Level 1: Layered
- Maturity Level 2: UseCase + Handler hands-on code
- Maturity Level 3: DDD + Hexagonal
- Case study: a marketplace — how I understood the task
- How to Split a System into Services: A Marketplace Map
- AI writes the code. So why bother with a methodology?
- The AI-native company: a small team plus agents, and why it still needs a methodology
- Executable engineering standard: an AI agent is your ESLint for architecture
- Phase test in the cabinet
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Phase 33. JavaScript
Language and runtime foundations: values and references, scope, closures, prototypes, promises, async/await and the event loop.
- JavaScript Essentials required
- Async and the Event Loop in JavaScript required hands-on code
- Types in JavaScript: primitives, objects, and typeof required
- Type coercion: ==, === and truthy/falsy required
- Scope: var, let, const and hoisting required
- Closures: how they work and why you need them required
- Prototypes: delegation and classes as sugar required
- Objects: references, copying, and immutability required
- Promises from the inside: chains, errors, and async/await required
- Iterators and generators
- Mock interview in the cabinet
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Phase 34. TypeScript
Types and narrowing, generics, classes and decorators, modules, npm and TypeScript tooling.
- TypeScript Basic Types: Annotations, Inference, Union and Any required
- Type Narrowing and Guards in TypeScript required
- Generics in TypeScript: Reusable Type-Safe Code required
- Classes and Decorators in TypeScript required hands-on code
- Modules and npm: how code is assembled from parts
- TypeScript and Node Tooling: Getting Started
- Mock interview in the cabinet
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Phase 35. The browser and practical CSS
Platform and styling: this, the event loop, DOM, security, critical rendering, errors, animations, bundling and practical CSS.
- this: call context required
- Event loop: how it works and where it bites required
- DOM events: bubbling, capturing, delegation required
- The browser and the network: where a page comes from, CORS, cookies and storage, XSS and CSRF required
- Critical Rendering Path required
- Error Handling in JavaScript and the Browser
- Animations: CSS and Optimizations
- Frontend Build: Bundlers and Approaches
- CSS Basics: Syntax, Linking Styles, and First Properties
- Cascade, specificity, and inheritance required
- Selectors: combinators, pseudo-classes, and pseudo-elements required
- The box model: sizes, box-sizing, and margin collapse required
- Document flow: display, visibility, and the float legacy required
- Positioning: from static to sticky and z-index required
- Flexbox: axes, alignment, and space distribution required
- Grid: two-dimensional layout required
- Units and responsiveness: rem, percentages, vw, and clamp required
- Styling: gradients, shadows, filters, and transforms
- Mock interview in the cabinet
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Phase 36. React
Components, typing, the rendering model and hooks.
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Phase 37. Frontend architecture
Project structure and architectural trade-offs: feature-based and layer-based design, FSD, module boundaries, Atomic Design and microfrontends.
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Phase 38. Data and state
State, data fetching, errors, forms.
- State: Local and Server required
- MobX and Redux Toolkit: State Managers in React
- Data fetching in React: TanStack Query required
- Клиент из OpenAPI
- Frontend error handling: error boundaries, error states, and Suspense required
- Forms in React: react-hook-form and zod required
- Состояние в адресе
- Mock interview in the cabinet
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Phase 39. Routing and delivery
Routing, styling and page delivery: SPA, SSR and SSG.
- Routing in React: React Router required
- Next.js и серверный рендер required
- Статические сайты и MDX
- Styling and design tokens required
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Phase 40. Quality and performance
Accessibility, performance, testing.
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Phase 41. Mobile app from the web
Web-first instead of native: PWA and Capacitor, native APIs through a bridge, iOS (WKWebView) and Android (TWA) specifics, push and offline — and the line where native starts.
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Phase 42. What testing is
Why software is tested, the QA role, manual vs automated, the software and testing lifecycle.
- What Testing Is and Why It's Needed required
- Who a Tester Is and Their Role on the Team
- Testing Myths and What You Actually Need to Start
- Manual and Automated Testing: What's the Difference required
- The Software Lifecycle and Where Testing Fits (SDLC and STLC) required
- Software Development Models: Waterfall, V-Model, and Iterations
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Phase 43. Types and levels
Test levels, functional and non-functional, black/white box, smoke and regression.
- Test Levels: Unit, Integration, System, and Acceptance required
- Types of Testing: Functional and Non-Functional required
- Non-Functional Testing Types in Practice required
- Black Box, White Box, and Grey Box; Smoke, Regression, and Sanity required
- Exploratory Testing and Degrees of Formalization required
- Localization Testing
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Phase 44. Test-case design
Writing test cases, the test plan and suites, reporting and metrics, effort estimation, test-design techniques, decision tables, checklists and data.
- How to write a test case: steps and expected result required
- Test Case Quality: Balances, Fault-Finding Power, and Typical Mistakes
- Test plan and test suites: how to organize your checks required
- Test Result Reporting and Metrics required
- Effort Estimation in Testing
- Test design techniques: equivalence classes and boundary values required
- Decision tables and pairwise testing required
- Checklists and test data required
- User Scenarios, Personas, and Test Case Suites
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Phase 45. Bugs
What a bug is, severity and priority, writing a bug report and making it high-quality, the bug lifecycle and trackers.
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Phase 46. Tools and practice
Test management, web basics (HTML/CSS/JS), client-server and HTTP, DevTools, API in Postman, SQL, cross-browser testing and Linux commands.
- Test Management: TestRail, Qase, Zephyr
- Web Basics: HTML, CSS, JavaScript, and the DOM
- Client-Server and HTTP: How a Page Talks to a Server required
- Browser DevTools for Testers required
- API Testing Basics in Postman required
- API styles for testers: REST, SOAP and GraphQL required
- Networking basics: how a request finds the server required
- Logging in: authentication, authorization and tokens required
- SQL for Testers required
- Cross-Browser and Mobile Testing
- Mobile app testing
- Linux Commands and the Terminal for Testers
- Logs and monitoring for testers required
- Data formats for testers: JSON, XML, YAML and CSV required
- Microservices, brokers and queues through a tester's eyes required
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Phase 47. Python for autotests
Python from scratch to autotests: variables and strings, conditions, lists and dicts, loops, functions, assert, working with data, pytest and API autotests. Every article comes with trainer tasks.
- Why a Tester Needs Python and How to Run the First Line
- Variables, Strings and Numbers required
- Comparisons and Conditions: How a Program Decides
- Lists and Dicts: JSON Is a Dict required
- Loops: Go Through Everything and Miss Nothing required
- Functions: Keep a Check in One Place required
- assert and Errors: How a Check Reports a Break
- Working with Data: Count, Compare, Find the Difference
- pytest: Your First Real Test required
- API Autotests in Python: Putting It Together required
- Mock interview in the cabinet
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Phase 48. UI end-to-end tests
Playwright: when an end-to-end test is worth it, setup, test structure and page objects, resilient locators, waiting instead of sleeps, data and login without the form, network interception, flakiness and CI runs.
- Когда нужен e2e required
- Настройка
- Структура тестов required
- Локаторы required
- Утверждения и ожидание required
- Данные и аутентификация
- Сеть
- Нестабильные тесты required
- E2E в CI required
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Phase 49. On a team and beyond
QA in Agile and Scrum, testing against requirements, automation basics and where to grow next.
- QA in Agile and Scrum: your role in a sprint required
- Testing against requirements required
- Requirement Levels and the Properties of Good Requirements
- Requirements Review: Techniques and Good Questions
- How Automation Works: Approaches and Economics required
- Git for testers: branches, commits and merges required
- CI/CD: The Pipeline, Tests and Artifacts
- Where to grow as a tester
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Phase 50. The role and stepping into it
What changes after the promotion and how to step into a team.
- Из инженера в лида required
- Первые 90 дней тимлида required
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Phase 51. The team: structure, ownership, people
System ownership, delegation, growing engineers, difficult conversations and leading several teams.
- Структура и владение required
- Делегирование и рост required
- Трудные разговоры required
- Почему уходят инженеры required
- Руководство направлением required
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Phase 52. Hiring and onboarding
The profile before the search, evaluation stages and a new hire's first thirty days.
- Найм и ввод в работу required
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Phase 53. Commitments: deadlines, flow, stakeholders
Estimates and commitments, inbound requests and choosing portfolio initiatives by money.
- Оценки и сроки required
- Стейкхолдеры и ожидания required
- Портфель и ROI required
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Phase 54. Engineering norms and quality
Review norms, technical debt, requirements, security and regulation.
- Нормы код-ревью required
- Технический долг required
- Артефакты и требования required
- ИБ и регуляторика required
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Phase 55. Reliability and operations
Metrics, logs and traces for diagnosing a running system.
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Phase 56. Decisions and recording them
The architecture committee, decisions by criteria, technology through a manager's eyes and vendors.
- Архитектурный комитет required
- Architecture choice
- Технологии для менеджера required
- Вендоры и импортозамещение required
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Phase 57. Measurement and the business conversation
Team metrics, the IT budget and technical risk in terms of money.
- Метрики команды required
- Бюджет ИТ: CAPEX и OPEX required
- Руководство и бизнес-риски required
Программа обучения v17.3.55
Product engineer · Java
The complete product engineer program on Java: Spring, backend, frontend and QA foundations, AI agents and LLM applications, then the full product cycle from problem to business metric and the management layer - team, hiring, commitments, quality, reliability, decisions and business communication.
The program has 2657 self-check questions in total.