Full-Stack API Developer
Summary
B2B contract role, 100% remote from Poland, integrating Hypoport's advisory engine into existing systems. Day to day is full-stack development (JavaScript plus Java) building REST API interfaces in a distributed agile team, with fluent German required and occasional on-site visits to Hanover.
Remote work: 100% remote.
Project language: German + English.
Start: ASAP/2 weeks.
Assignment type: B2B – up to 45 EUR/h.
Project length: first contract until the end of the year, then regular extensions 6-12 months.
Onboarding: 1 week on-site in Hanover.
Additional visits: once every 2-3 months for 3 days on demand.
Workload: full time (40 hours per week).
Industry: Finance.
Summary: The Full-Stack API Developer is responsible for integrating Hypoport’s advisory engine. This role aims to enhance existing systems and support clients with technical integration, fostering collaboration within a distributed agile team.
Main Responsibilities:
Develop and integrate REST API interfaces into existing systems.
Implement technical requirements within a large-scale integration and brokerage project.
Full-stack development in the JavaScript ecosystem (frontend & backend).
Collaborate with internal and external developers in a distributed agile setup.
Analyze and evaluate existing codebase, contribute to architectural decisions.
Convert business requirements into technical solutions & maintain documentation.
Close collaboration with team leads, business units, and stakeholders.
Support onboarding-related topics (firewall, whitelisting, internal processes – client will guide this).
Key Requirements:
Strong experience in Java, REST API development & API design.
Excellent JavaScript skills (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) – mandatory 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.
