Backend API Engineer (TypeScript/Node.js) – AWS

Levy Professionals; Amsterdam; On-site; EUR 90,000 - 130,000; Full time

Job summary

Levy Professionals is seeking a Backend Engineer to own and evolve a secure API platform in a fintech environment. You will design, implement, and deploy partner-facing services using TypeScript/Node.js on AWS, focusing on API quality, security, and scalability.

You will drive API design, contribute to OpenAPI specifications, and work with a senior team to ensure robust, production-ready delivery and strong observability across the system.

Qualifications

• Hands-on backend development with TypeScript/Node.js.
• Strong REST/JSON API design and OpenAPI mindset.
• Hands-on AWS experience with containers, queues, managed databases, secrets, and load balancing.
• Test-forward approach with unit/integration/contract tests.
• Knowledge of API security (OAuth/JWT) and tenancy isolation.

Responsibilities

• Grow API surface with new endpoints, webhooks, and richer querying options for partners.
• Improve partner integration with OpenAPI specs, docs, and sandbox environments.
• Harden the platform with rate limiting, secret rotation, contract testing, and pen-test remediation.
• Build for scale with multi-partner onboarding, tenant isolation, load testing, and caching.
• Establish SLOs, alerts, and strong observability patterns.

Skills

TypeScript

Node.js

REST API design

OpenAPI

AWS

Tools

OpenAPI

AWS

Job description

Levy Professionals is seeking a Backend Engineer to own and evolve a secure API platform in a fintech environment. You will design, implement, and deploy partner-facing services using TypeScript/Node.js on AWS, focusing on API quality, security, and scalability.

You will drive API design, contribute to OpenAPI specifications, and work with a senior team to ensure robust, production-ready delivery and strong observability across the system.