Senior Java Developer

Senior Java Developer - AIDA Recruitment | Career Page

Senior Java Developer

Warsaw, Poland

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Job Openings Senior Java Developer

About the job Senior Java Developer

For our client an IT company specializing in new product development and R&D, focused on solving complex challenges in the tech industry we are looking for a Senior Java Developer based in Poland or Lithuania.

Responsibilities

• Feature development — design, implement, and integrate new functionality using Java 17–21 and the Spring ecosystem; participate in architectural discussions and code reviews;
• Application support & maintenance — provide ongoing support, troubleshoot production issues, and fix bugs to ensure high availability and stable performance;
• Cloud deployment — manage deployment, configuration, and hosting of applications on AWS infrastructure; contribute to infrastructure improvements;
• Data persistence — handle database interactions, schema design, and query optimization using MySQL and Hibernate ORM;
• Build management — use Gradle and Maven for dependency management and build automation;
• Technical ownership — contribute to architectural decisions, propose and evaluate technical solutions, and drive continuous improvement of the codebase.

Requirements

• 5+ years of commercial Java development experience;
• Deep knowledge of Java 17–21 (records, sealed classes, virtual threads, pattern matching);
• Strong command of the Spring ecosystem — Spring Boot, Spring MVC, Spring Data, Spring Security;
• Experience with relational databases (MySQL), query optimization, and Hibernate / JPA;
• Solid AWS experience — EC2, S3, RDS, IAM, CloudWatch or equivalent services;
• Proficiency with Gradle and/or Maven;
• Strong understanding of REST API design and microservices architecture;
• Experience writing clean, testable code with unit and integration tests (JUnit, Mockito);
• Confident reading and reviewing others' code; track record of meaningful code reviews;
• Upper-Intermediate English or above — comfortable in written and spoken communication with the team.

Nice to have

• Experience with Docker and container orchestration (Kubernetes / ECS);
• Familiarity with message brokers — Kafka, RabbitMQ;
• Knowledge of CI/CD pipelines (GitHub Actions, Jenkins, GitLab CI);
• Exposure to reactive programming (Project Reactor, WebFlux);
• Experience with monitoring and observability tools (Prometheus, Grafana, ELK);
• Understanding of DDD, CQRS, or event-driven architecture patterns.

Company offers

• Warsaw (Poland) - fully remote work (B2B contract);
• Vilnius (Lithuania) - hybrid/remote (B2B or employment contract).
• Salary range: 54 000$ - 66 000 EUR$ Annually (negotible)

Recruitment Process

• CV Screening: Applications are reviewed within 24 hours.
• Pre-Screening Interview: A brief Q/A session (Automated or with a Recruiter) designed to learn more about your experience related to the required job position.
• Automated Session (Recommended) – You can complete this session on your own at a time that is convenient for you. The questions and follow-ups are well-structured and designed to highlight your experience and provide detailed insights into your background. This option is recommended because it's usually more detailed and allows us to provide feedback from the hiring manager faster.
• Session with a Recruiter – You can also have the session with a recruiter. The questions are the same, but the discussion may be a bit less detailed, and feedback might take a little longer.
• Shortlisting: Qualified candidates are presented to the hiring manager for review.
• Formal Interviews: On-site discussions with the hiring manager or project team, with feedback provided within 1-2 weeks.
• Offer and Onboarding: Successful candidates receive a formal offer and begin a structured onboarding process.

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