Senior Java Developer
MUKUkraine2 days ago
Full-timeEngineering, Information Technology
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Requirements
- Higher technical education;
- Work experience: 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.
- 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.
Key Skills
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