Java Developer at Zenith System Solutions in Belgrade, Serbia (full-time)

Develop, test, deploy and maintain backend services and APIs using Java.

• Participate in designing scalable, maintainable, enterprise-wide applications & systems.
• Ensure application performance, responsiveness and reliability.
• Collaborate with cross-functional teams (QA, DevOps, Product Owners) to deliver features.
• Integrate with internal and external systems via REST APIs, messaging queues or other integration mechanisms.
• Debug, troubleshoot and resolve production issues.
• Write clean, well-documented code; adhere to coding standards and best practices.
• Contribute to code reviews.
• Maintain documentation for the solutions you build (designs, operations, etc.).
• Monitor and improve system performance; identify bottlenecks.

Strong experience with Java SE/EE, plus frameworks like Spring / Spring Boot, Hibernate / JPA.

• Good knowledge of relational databases (e.g. MySQL, PostgreSQL, Oracle).
• Experience with RESTful API development.
• Familiarity with build tools like Maven or Gradle.
• Version control tools (e.g. Git).
• Ability to work in an Agile development environment.

Add on:

• Experience with microservices architecture.
• Exposure to message brokers (e.g. RabbitMQ, Kafka).

Experience with CI/CD pipelines.

• Knowledge of cloud platforms (AWS, Azure, etc.).

Work flexibility

Zenith System Solutions, we are a trusted systems integrator specialising in end-to-end (E2E) technology solutions tailored for telecom and financial services enterprises. With over two decades of hands-on experience, our focus lies in delivering transformative outcomes across development, integration, implementation, testing, and migration services.

Our work spans across critical and fast-evolving technology landscapes—including BSS/OSS, 5G, Data Engineering, Cloud, IoT Deployments, and Digital Transformation. We empower our clients to stay ahead of the curve by blending deep industry knowledge with modern tools and agile methodologies.