Senior Java Developer

Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!

We are looking for an experienced Senior Java Developer to join a team building advanced digital solutions that support the diagnosis and treatment of oncology patients. Our mission is to improve patient outcomes by combining modern technologies with the healthcare domain.

You will work on a suite of products designed to streamline medical case coordination, enable efficient data ingestion and management, provide a holistic view of the patient journey, and deliver analytics and reporting capabilities that help make treatment more effective.

What you will do

• Design, develop, and maintain full‑stack features across a complex ecosystem of healthcare‑focused applications.

• Collaborate with cross‑functional teams to deliver scalable, secure, and high‑quality solutions.

• Contribute to architectural decisions and technical strategy.

• Ensure code quality through testing, reviews, and adherence to engineering best practices.

• Work with cloud‑native infrastructure and modern DevOps tooling.

• Support continuous improvement of development processes and system reliability.

What we are looking for

• 5+ years of hands-on software development experience with a proven track record of delivering scalable systems

• Degree in an Engineering discipline, B2+ English, and a collaborative spirit for mentoring and team-building

• Expert knowledge of Java (latest versions), Spring Boot, Hibernate/JPA, and RESTful API design

• AI-First Mindset: proficiency in using AI coding assistants and LLMs for software development

• Deep understanding of microservices, event-driven patterns (Async), and distributed systems

• Excellent knowledge of SQL databases

• Strong experience with AWS (EKS, S3, DynamoDB, ElastiCache, Lambda) and modern Docker/K8s workflows

• Experience developing reusable architectural components for multiple projects

Perks and benefits (our offer)

• Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers.

• Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location.

• Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more.

• Global collaboration - work with a diverse, international team.

• Innovative environment - be part of a forward-thinking and growth-oriented workplace.

• Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work.

• Team-building events including our company tradition (annual company event in Mazury).

• A pleasant surprise to start your journey with us in the form of a welcome pack.

Recruitment process:

• HR call

• Technical Interview

• Interview with the dedicated Client

• Final decision/ Feedback

Sounds interesting? Click "Apply" and have a chance to hear more!