backend developer for secure APIs
HireHi · Netherlands ·
- Employment
- Contract
- Category
- Backend
- Visa sponsorship
- No
HireHi · Netherlands ·
flutterbe · Sofia, Bulgaria
HCLTech · Toronto, Canada
flutterbe · Tbilisi, Georgia
Fincons Group · Brussels
HireHi is hiring a contract backend developer (36 h/week, start ASAP through 1 June 2027, ZZP allowed) based in the Netherlands to build, harden, and scale secure multi-partner APIs. Day to day: designing REST/JSON endpoints, webhooks, and tenant isolation with TypeScript/Node.js on AWS, plus API security (OAuth/JWT), queue-driven workers, contract testing, observability, and CI/CD.
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
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 Будет плюсом: fintech or other regulated-domain experience, platform/API-gateway team background, independently leading a small delivery
36 Hours per week Start: asap End: 01 June 2027 Possible extension: Yes ZZP is allowed Contract
Enfint · London, United Kingdom