Senior Backend Engineer (Java / Kotlin / AWS)

Overview

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.

Responsibilities

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

Qualifications

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