Backend Java Developer

Join an internal development team supporting a US-based FinTech client in the cryptocurrency sector. You will work on a mix of new features and maintenance of an existing legacy system. This role requires a "detective" mindset—often, the business and technical logic must be extracted directly from the code, as documentation may be sparse. Details • Client Location: USA  • Rate:110-130 PLN/h net + VAT (B2B) • Start Date: ASAP (within 1 month). • Duration: Long-term (no defined end date). • Working Hours: Availability until 17:00–17:30 CET (ensuring a 2-hour overlap with the US). • Equipment: Dedicated laptop provided (includes an activity tracker, currently inactive but present). Responsibilities • Full-Cycle Development: Developing new functionalities and maintaining the existing crypto platform. • Legacy Management: Working with "spaghetti code" and legacy architectures to ensure stability and growth. • Technical Research: Independently discovering business and technical logic within areas where the client lacks documentation. • Collaboration: Participating in weekly cross-team "Grand Dailies" and ad-hoc meetings with the Product Owner. • Communication: Direct, fluent communication with the US-based client. Requirements Technical Requirements • Core: Strong proficiency in Java and Spring framework. • Architecture: Hands-on experience with Microservices and gRPC. • Data & Messaging: Solid knowledge of MySQL and Kafka. • Problem Solving: Ability to navigate and refactor complex, undocumented legacy systems. Soft Skills • Proactivity: High level of independence in seeking information and solving technical debt. • English: Excellent verbal and written communication (Fluent/B2+). • Teamwork: Maturity in working within a self-managed team structure.