Introduction
- 36 hours per week
- Start: 07 September 2026
- End: 01 June 2027
- Possible extension: Yes
- ZZP is allowed
- Hybrid way of work
- Candidates MUST live in the Netherlands at this moment
Function
Your new company
We are New10, a financial service scale-up initiated by ABN AMRO Bank. At New10 we believe that business financing should be easy and accessible.
We are on a quest to transform the financing ecosystem by using the speed and innovative strength of a fintech with the expertise and funding of a bank to deliver a fast, simple, and clear financing experience to SME businesses.
Backend Engineer – API Development
The role in one line:
An independent backend engineer to help build, harden, and scale our secure APIs – strong on API craft, security, and testing, and able to help drive delivery, not just execute tickets.
Context:
Work across our API surface, held to real financial-institution standards for security, reliability, and testing. It’s a deliberately simple, well-structured codebase. No internal/domain business knowledge required, that’s owned in-house. We need backend and API strength.
Where they add the most value:
Since internal logic is covered, their leverage is on the partner-facing platform and developer experience:
– Growing the API surface cleanly (new endpoints, webhooks/callbacks, richer querying)
– Developer experience – clear contracts, published API specs, integration docs, sandbox environments
– Hardening – rate limiting, secret rotation, contract testing, pen-test remediation
– Scaling – repeatable multi-partner onboarding, tenant isolation, load/performance testing, caching
– Platform quality – SLOs, alerting, resilience patterns
Ways of working:
– Independent and self-directing – takes a capability from spec → design → tested delivery without hand-holding
– Helps manage the work – can break down a body of work, sequence it, and drive it to a clear “done”
– Spec- and documentation-driven – at home working from and writing specs, acceptance criteria, and decision records; a clear, concise writer
– Comfortable with AI-assisted / agentic development – this project is built heavily with agentic tooling; someone who can direct and review that output well is a real multiplier
– Quality-first and pragmatic – treats security, testing, and observability as ship-blocking, while favoring simple solutions over over-engineering
Requirements
Core skills:
– Modern backend development in TypeScript / Node.js – server-side HTTP services, networking fundamentals, clean typed code
– REST/JSON API design – versioning, consistent error contracts, idempotency, pagination, and an API-as-contract mindset (OpenAPI)
– Relational data – schema design, migrations, and a data-integrity mindset
– Asynchronous & queue-driven systems – background workers, job lifecycles, retries, idempotent processing
– API security – token-based auth (OAuth/JWT), authorization and tenancy isolation, secure secret handling, “fail-closed” defaults, and awareness of industry baselines (e.g. OWASP API Security Top 10)
– Test-forward development – comfortable driving work through unit, integration, and contract tests as a first-class part of building, not an afterthought
– Hands-on AWS experience (mandatory) – must know the specifics of core AWS services (containers/compute, queuing, managed databases, secrets, load balancing). Given the short timeline and MVP nature, we prefer they not need to onboard onto a new cloud;
– Cloud-native delivery – building and shipping containerized services, infrastructure-as-code (Terraform ideal), CI/CD pipelines
– Observability – structured logging, metrics, tracing, and audit trails; can debug production from telemetry
Nice-to-haves:
fintech or other regulated-domain experience · platform / API-gateway team background · leading a small delivery independently.
Information
Jobs A2Z-CM +31(0)20-3337629
Application
Jobs A2Z-CM +31(0)20-3337629