HubMub
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MUK

Senior Java Developer

MUK
Ukraine · Full-time · Not Applicable
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.

Key Skills

Ranked by relevance

java spring boot devops gitlab redis maven jvm
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Posted
Mar 13, 2026
Type
Full-time
Level
Not Applicable
Location
Ukraine
Company
MUK

Industries

IT Services IT Consulting

Categories

Engineering Information Technology

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