Description
No description provided.
Responsibilities
•Build, harden, and scale secure APIs
•Grow the API surface with new endpoints, webhooks/callbacks, and richer querying
•Improve developer experience through clear contracts, published API specs, integration documentation, and sandbox environments
•Harden APIs through rate limiting, secret rotation, contract testing, and pen-test remediation
•Scale repeatable multi-partner onboarding, tenant isolation, load/performance testing, and caching
•Improve platform quality through SLOs, alerting, and resilience patterns
•Take capabilities from specification and design through tested delivery independently
•Break down and sequence work, and drive it to completion
•Write and work from specifications, acceptance criteria, and decision records
•Direct and review AI-assisted development output
•Prioritize security, testing, and observability while favoring simple solutions
Requirements
•Modern backend development in TypeScript/Node.js, including server-side HTTP services, networking fundamentals, and clean typed code
•REST/JSON API design, including versioning, consistent error contracts, idempotency, pagination, OpenAPI, and an API-as-contract mindset
•Relational data schema design, migrations, and data integrity
•Asynchronous and queue-driven systems, including background workers, job lifecycles, retries, and idempotent processing
•API security, including token-based authentication (OAuth/JWT), authorization, tenancy isolation, secure secret handling, fail-closed defaults, and awareness of OWASP API Security Top 10
•Test-forward development using unit, integration, and contract tests
•Hands-on AWS experience is mandatory, including containers/compute, queuing, managed databases, secrets, and load balancing
•Cloud-native delivery with containerized services, infrastructure as code, and CI/CD pipelines
•Observability through structured logging, metrics, tracing, and audit trails; ability to debug production using telemetry
•Must currently live in the Netherlands
Nice to have
•Fintech or other regulated-domain experience
•Platform/API-gateway team background
•Independently leading a small delivery
Conditions
•36 hours per week
•Start: ASAP
•End: 1 June 2027
•Possible extension: Yes
•ZZP (freelance) contract allowed
•Contract position
