Senior Backend Engineer (Java / Kotlin / AWS)

Routescanner is the world's leading container logistics intelligence platform, helping shippers, freight forwarders, and cargo owners discover, compare, and optimize intermodal container routes based on transit times, carrier reliability, and CO₂ emissions. Our platform connects thousands of logistics professionals with actionable, real-time routing data – making global supply chains more efficient, resilient, and sustainable. We're growing fast, and we're looking for a senior backend engineer who doesn't need hand-holding to thrive.

The Role You'll be a core member of a small, high-ownership engineering team building and evolving the distributed microservices backend that powers Routescanner. You'll work across a complex domain – route optimization, schedule ingestion, geo-routing, and carrier data – at real scale, on AWS. This is not a role for someone who waits for specs to land in their inbox. You'll take full ownership of services from design through production, make architectural decisions, and proactively identify and fix problems before they become incidents.  What You'll Work On Design, build, and maintain JVM-based microservices (Java / Kotlin) running on AWS ECS, App Runner, and Lambda

Work with a rich data layer: PostgreSQL, DynamoDB, RedShift, Redis, and S3

Build and consume event-driven integrations via RabbitMQ and SNS

Collaborate on API design across REST (API Gateway) and BFF patterns

Instrument services with OpenTelemetry, Tempo, Prometheus, and Grafana

Ship via GitHub Actions CI/CD pipelines with Docker and ECR

Work with external integrations including Auth0, GraphHopper, PostHog, and Sentry

Leverage AI-assisted development tools (Claude) as part of your daily workflow

Participate in architecture decisions and technical direction – your opinion will carry weight

What We're Looking For Must-haves: 5+ years of professional backend development in Java and/or Kotlin

Fluent in Polish and English

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)

Familiarity with AI-assisted development tools

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

AI tooling as a first-class part of the workflow – not an afterthought

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 )