Senior Back-End Developer

About us

Customers who call us usually reach someone who wrote the code they are asking about. Profitable, no outside investors, and no plans to take any. We grow when customers pay us. Most engineers work remotely and come into the office one week a quarter for planning.

The role

We are backfilling a position after an internal move. We want someone who writes boring, reliable code and leaves good logs behind. The operations team owns services that process several million requests a day. We need another engineer who is comfortable owning them in production. Remote, open to candidates across the Netherlands. We keep meetings to a minimum and work mostly async.

What you'll work on

• Secure endpoints with OAuth 2.0, JWT validation and proper input checks.
• Implement background jobs and event consumers using Kafka, SQS or RabbitMQ.
• Add caching with Redis where it actually helps, and remove it where it doesn't.
• Write integration and contract tests so API changes don't break consumers.
• Tune slow queries, add indexes and read query plans.
• Design and build REST and gRPC APIs in Go, Java or Python.
• Review code for correctness, performance and failure handling.

What we're looking for

• Strong SQL and relational data modelling skills.
• Working knowledge of message queues or streaming platforms.
• Hands-on experience with AWS, GCP or Azure services.
• Clear written communication, including design docs.
• Understanding of concurrency, transactions, idempotency and retries.

What you get

• Home office allowance.
• 8% holiday allowance.
• Travel allowance.
• Pension scheme.
• Laptop and phone.
• Bike plan.

Start: Immediately.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Winchdale Labs B.V..