Software engineer TS/Node.js / AWS

For a client based in Amsterdam, We are looking for a freelance software engineer that can join a Bulk Operations Module team. This role is only suitable for freelance candidates (ZZP) that are based in the Netherlands. No relocation or sponsorship is provided.

Must-have skills

Techstack:

TypeScript/Node.js and API development, AWS services, AWS Lambda, queues, workers, orchestration, idempotency, retries, and scaling, S3, DynamoDB, security, observability, testing, CI/CD, and operations

Independent end-to-end delivery:

Owns the design, implementation, testing, deployment, and production operation of software solutions with limited supervision.

Strong programming fundamentals : Writes readable, maintainable, and reusable code in the team's primary programming language. Experience developing with coding agents.

Testing and quality:

Independently applies unit, integration, and contract testing; writes testable code and maintains appropriate test coverage.

Production ownership : Deploys and monitors services independently, investigates production issues, and uses logs, metrics, and traces effectively.

Reliability and failure handling:

Designs for failure using mechanisms such as timeouts, retries, circuit breakers, dead-letter handling, and graceful degradation.

Observability : Defines and uses meaningful Service Level Indicators (SLIs), Service Level Objectives (SLOs), key performance indicators, and alerts.

Collaboration and communication:

Clarifies requirements, identifies edge cases, communicates technical decisions, and collaborates effectively with product and partner.

Good-to-have skills

AWS Durable Lambdas for orchestration and execution

Experience evolving APIs and schemas while maintaining backward compatibility.

Familiarity with experimentation, continuous delivery, feature flags, and safe rollout strategies.

Agent programming using a spec driven development framework like openspec.

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