➡️ Apply here: Senior Java Developer
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**Requirements:**
* Higher technical education
* 5+ years of commercial experience in Java development
* Experience in supporting and developing large monolithic production systems
* Willingness to take responsibility for architectural and technical decisions within the monolith
* Java 17+ — deep understanding of JVM, memory, GC, threads, profiling
* Excellent knowledge of Java Core, collections, multithreading, streams
* Experience in performance optimization and troubleshooting in long-running applications
* Deep knowledge of relational databases
* Understanding of HTTP, CORS, WebSockets
**Responsibilities:**
* Spring Boot / Spring Framework — designing and developing monolithic applications
* Spring Security — complex authentication and authorization schemes (OAuth2, JWT, SSO)
* Spring MVC — controllers, filters, interceptors, error handling
* Spring Data JPA / Hibernate — deep understanding of ORM, entity lifecycle, N+1, batching, 2nd-level cache
* Designing a modular monolith (package-by-feature, bounded contexts)
* Understanding and applying SOLID, DRY, KISS, design patterns
* Separation of layers: controller / service / domain / persistence
* Designing schemas, indexes, complex transactions
* Optimization of heavy queries and batch operations
* Redis — data caching, sessions, synchronization within a monolith
* Development and support of REST API for external and internal systems
* Working with synchronous integrations and asynchronous tasks within the application
* Managing the database schema using Liquibase
* Backward compatibility of changes
* Supporting API versioning
* Monolith testing architecture: unit / integration / e2e
* Support for high coverage and stability of regression tests
* DevOps Maven, Gitlab, basic understanding of CI/CD
* Mentoring developers
* Conducting code reviews
* Working with technical debt
* Ability to plan refactoring and explain its business value