Java Middle developer

Core Technical Skills

• Strong knowledge of Java 8
   Streams API, Optional, functional interfaces
   Concurrency basics (threads, executors, synchronization)
• Solid experience with Spring Framework
   Spring Boot
   Spring MVC
   Spring Data JPA / Hibernate
• Experience with Spring Security
   Authentication/authorization concepts
   JWT / session-based security
• Database expertise (MySQL)
   Writing complex SQL queries
   Indexing, query optimization
   Transactions and isolation levels
• Experience with NoSQL databases

Backend & Architecture

• Understanding of RESTful API design
• Knowledge of microservices principles
• Experience with API versioning and backward compatibility
• Familiarity with messaging or async processing

Code Quality & Practices

• Clean Code principles
• SOLID principles
• Experience with unit and integration testing (JUnit, Mockito)
• Code review participation
• Basic knowledge of design patterns

DevOps & Tools

• Git
• Build tools (Maven)
• Basic understanding of CI/CD pipelines
• Experience with Docker

Nice to Have

• Experience with Java 21

  Virtual threads

  Records, pattern matching, switch enhancements

  Understanding of modern JVM improvements

• Experience with Redis
• Experience with Cassandra
• Experience with cloud platforms (AWS/Oracle/Azure)
• Knowledge of distributed systems basics
• Experience with Kafka or similar tools
• Understanding of security best practices (OWASP)

Performance & Reliability

• Understanding of caching strategies
• Basic profiling and performance tuning
• Handling errors, logging, and monitoring basics

Soft Skills

• Clear communication
• Ability to estimate tasks and meet deadlines
• Ownership of features from development to delivery
• Ability to work in a team and participate in discussions
• Problem-solving mindset
• Openness to feedback and continuous learning