*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.
*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.

Senior Java Developer

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