More about usBillennium 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!About the ClientWe are looking for an experienced Java Developer who will join a long-term project for our client from the communication technology industry.What will you do: Design and build systems which add features to our fraud prevention platform Work with the Product team to define requirements, then iterate based on customer feedback Write efficient and scalable code, in well-tested systems, running on public cloud infrastructure End-to-end ownership of what you ship, from architecture discussions through implementation to monitoring in production What we are looking for: 5+ years of experience in Java An excellent practical understanding of high performance distributed computing A strong focus on testing, with a customer-first mindset Experience of multi-threaded, 3-tier architectures, web services and caching Experience dealing with event-driven pipelines Experience in LLM (Large Language Model) Experience with AWS Good communication skills in English Nice to have: Experience integrating with Machine Learning systems to deliver product features Experience with Redis and Kafka Perks and benefits: 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!