DevTrainer: тесты Java

Preparing for a Java developer interview?
Afraid you'll forget your theory during a technical interview or want to refresh your knowledge before looking for a new job?

DevTrainer is a hardcore pocket-sized training tool for backend developers: 84 tests and nearly 3,000 questions actually asked in technical interviews.

No fluff or "learning programming from scratch." Just a specialized knowledge assessment for those who want to confidently pass the technical screening and get an offer. Cover your gaps before the interview, not right during it!

⚙️ 9 TOPICS — JUST LIKE IN REAL INTERVIEWS
• Java Core: OOP, String pool, equals/hashCode, exceptions, generics, Stream API
• Collections: HashMap internals, ArrayList vs. LinkedList, fail-fast iterators
• Multithreading: threads, synchronized/volatile, JMM, Executors, CompletableFuture
• JVM and memory: Garbage Collector, Heap/Stack, memory leaks
• Spring: DI/IoC, beans, Spring Boot, Data JPA/Hibernate, transactions, N+1 problem
• SQL and databases: indexes, transaction isolation levels, JOINs
• Testing: JUnit 5, Mockito, Testcontainers, TDD
• System Design: scaling, caching, rebalancing, microservices
• Patterns: SOLID, GoF, MVC/MVVM, CQRS, Saga

🎯 CHOOSE YOUR GRADE
Each test has its own difficulty level: Junior, Middle, or Senior.
Aiming for a middle level? Don't waste time on basic tests – test yourself right away with complex questions on architecture and frameworks' internals.

📊 ERROR REVIEW
After each test, you'll receive a detailed analysis: what you answered incorrectly and why, with an explanation of the correct answer. An error in the simulator means one less question to fail in a real interview.

The app is free. Install it, choose your grade, and see if you're ready for an offer today.