Full-Stack API Developer

• 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.