Freelance Kotlin Developer (Fulltime)
Must-haves:
- Work permit for Poland
- 5+ years of professional backend development in Java and/or Kotlin
- Solid understanding of distributed systems design, microservice patterns, and event-driven architecture
- Hands-on production experience with AWS (ECS, Lambda, S3, RDS or DynamoDB)
- Experience with relational databases (PostgreSQL) and NoSQL (DynamoDB or similar)
- Strong command of Docker and containerized deployments
- Experience with CI/CD pipelines – we use GitHub Actions
- Clean code as a practice, not a talking point – you write code that your colleagues can confidently extend
- Genuine ability to self-direct: you can take a loosely defined problem, break it down, make decisions, and deliver
Strong plus: - Kotlin specifically (greenfield services are Kotlin-first)
- Experience with message brokers (RabbitMQ, SQS/SNS)
- Familiarity with observability tooling (OpenTelemetry, Prometheus/Grafana stacks)
- Background in logistics, routing, geospatial, or supply chain domains
- Experience integrating third-party APIs (auth providers, mapping/routing engines, analytics)
How we work
- Small team, high trust – no micromanagement, no approval chains for every decision
- GitHub-centric workflow – PRs, reviews, and automated pipelines keep quality high without bureaucracy
- Observability-first – we monitor, alert, and fix things before users notice
- Clean code culture – we refactor, we review, we don't let tech debt compound silently
- AWS-native – we use managed services where they make sense and containers everywhere else
What we offer
- Competitive salary benchmarked to your market
- Remote-friendly setup (we care about output, not location)
- Direct impact on a product used by global logistics professionals every day
- Work in a genuinely interesting domain – intermodal routing is hard, and the problems are real
- A lean, senior team where your architecture decisions actually ship
Are you the perfect match?
Send your portfolio, CV, and a short message about why you’re the perfect match to us
Want to know more?
Do you have any questions about this position? Feel free to contact our technical lead Sylwester Wieczorkowski
( s.wieczorkowski@dirkzwager.com)