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.