Middle+/Senior Java Backend Developer

As part of our continued growth, Neo Group is recruiting on behalf of one of our local partners , leveraging our network of 1,400 talented professionals across 10+ countries. Together, we are committed to delivering innovative, data-driven solutions that empower our clients and foster professional growth within a dynamic and collaborative workplace. We are on the lookout for a Middle+/Senior Java Backend Developer to join our IT Department. Responsibilities : Lead the full development lifecycle: from idea to production rollout Develop and maintain the backend of a high-load application Design and implement APIs, integrate with external and internal services Work with databases, write efficient SQL queries and migrations Optimize performance and scalability of solutions Ensure code compliance with internal standards and best practices Test, debug, and support the code Collaborate with frontend developers, DevOps engineers, and other teams Requirements 3+ years of commercial experience in Java development Understanding of web application fundamentals using Apache Tomcat Understanding of multithreading and concurrency in Java (ExecutorService, CompletableFuture, Virtual Threads, Synchronization, Thread safety) Strong knowledge of Spring Boot, including Spring MVC, Spring Security, Spring Data Experience building RESTful APIs Hands-on experience with Kafka in production/high-load environments Experience working with relational (PostgreSQL, MySQL) and non-relational databases (MongoDB, Redis) Proficient in Git and experience in team-based development Understanding of microservices architecture Solid skills in writing unit and integration tests using JUnit, Mockito or similar tools; commitment to well-tested and reliable code Experience writing cloud-native (Docker, Kubernetes), distributed systems in Java and Spring Boot Experience leveraging AI-powered coding assistants (such as Claude) to enhance productivity, code generation and refactoring Soft Skills : Ability to clearly articulate technical solutions and justify choices Strong teamwork and communication skills Responsible, result-driven collaborator and effective communicator Enthusiastic to learn and grow with the team Benefits Annual salary €51,000–€69,000 gross Kick off your birthday month with a bang! Not only do you get heartfelt birthday wishes from your team, but you also enjoy a fully-paid day off. Celebrate your way! Your dedication deserves more than applause. Depending on your tenure, you can snag up to 1,000€ in gift vouchers and unique souvenirs to mark your milestones with us. Prioritize your health with up to 80€ gross per month for wellness activities. Stay fit, unwind, or both – on us! Enjoy two paid meals per week, facilitated by our very cool office manager. Invest in your growth with 500€ annually for learning. We're investing in your future! When you need time off for health reasons, enjoy 2 fully-paid health days, plus additional…