Senior Backend Developer

100% remote Budget: up to 160 PLN net/hour (B2B) This is a product that makes a real difference. It is used by hospitals and laboratories to generate reports that help oncologists select personalised cancer treatments. The code you write can have a tangible impact on clinical decisions and patients’ well-being. Responsibilities Developing and maintaining the application’s backend in Java and Spring as part of a mature, commercial clinical product used by hospitals and laboratories. Designing, implementing and optimising services and APIs supporting the interpretation of NGS sequencing data and the generation of clinical reports. Working with a PostgreSQL database — designing schemas, writing and optimising queries, and ensuring data integrity and performance. Developing and maintaining applications in the AWS cloud environment, using containerisation with Docker. Working with an existing codebase that has been under development for several years — analysing, refactoring and safely introducing changes to the legacy system. Collaborating within an Agile/Scrum team — participating in planning, reviews and daily stand-ups, and managing code using Git/GitHub. Ensuring the quality, reliability and security of solutions in accordance with the requirements for software used in the medical sector. Must-have Java Spring AWS Docker Git/GitHub PostgreSQL Knowledge of Agile methodologies, particularly Scrum