Freelance Kotlin Developer (Fulltime)

Job description

Company Description You'll be a core member of a small, high-ownership engineering team building and evolving the distributed microservices backend that powers our app. 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 - Participate in architecture decisions and technical direction – your opinion wil...