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We are seeking experienced Full-Stack / API Developers to join our client’s team. The successful candidates have profficient level of German language strong background in REST API development and JavaScript , along with proficiency in engaging within agile software environments. The role requires collaboration in a remote setup, addressing both frontend and backend development tasks with an emphasis on integrating advisory solutions into an established system. Main Responsibilities: Develop and integrate REST API interfaces into existing systems. Implement technical requirements within a large-scale integration and brokerage project. Engage in full-stack development in the Java and JavaScript ecosystem. Collaborate with internal and external developers in a distributed agile setup. Analyze and evaluate existing codebase, contributing to architectural decisions. Convert business requirements into technical solutions & maintain documentation. Work closely with team leads, business units, and stakeholders. Support onboarding-related topics with guidance from FI. Key Requirements: Strong experience in REST API development & API design . Excellent experience with Java (backend) AND JavaScript (frontend or full-stack). Proven experience as a Full-Stack Developer . Background in agile software development . Ability to analyze, structure and optimize existing code. Proactive communicator & team player. Fluent German (B2/C1) - essential for documentation & daily communication. Nice to Have: Experience in regulated industries (banking, insurance, energy). IT security / firewall / networking knowledge. Experience with document management systems. Background in integration-heavy or interface-driven projects. Experience in the German financial sector. Other Details: This role involves a one-week onboarding on-site in Hanover, followed by remote work. The engagement is long-term with an annual on-site workshop and potential additional visits based on demand. Travel costs will be calculated separately.