Senior Backend Engineer

This is a hands-on engineering role for someone who still writes production code every day and enjoys taking full ownership of backend services from design through to operation. What you'll be working on Building the next generation of AI-powered learning platformDesigning and operating backend services in a serverless AWS environmentWorking primarily with TypeScript, Node.js, AWS Lambda, API Gateway and DynamoDBDesigning scalable APIs and data modelsOwning services in production, including monitoring, incident handling and continuous improvementLeveraging AI coding agents as part of the daily development workflow What we're looking for Strong hands-on experience with TypeScript and Node.js backend developmentDeep practical experience with AWS serverless architecturesExperience designing APIs and data contractsProven ownership of production systemsDaily use of AI coding agents and validation of their outputFamiliarity with Terraform and CI/CD pipelinesPython experience is a plusProject Details If this sounds like you: Senior freelance backend engineer who still codes every dayStrong hands-on TypeScript, Node.js and AWS experienceBuilt and operated production services using Lambda, API Gateway and DynamoDBUses AI coding agents daily and reviews their outputComfortable owning services end-to-end Not the right fit if: Primarily a Frontend (React/Angular) developer Mainly Engineering Manager, Team Lead or Architect Primarily Python, Java or .NET without recent TypeScript/Node.js focus Mostly consulting, coordinating or designing instead of building software every day Start: ASAP Location: Remote / on site in Berlin 1-2x a week preferred Type: Freelance / Contract Project length: at least 6 months with option to stay on longer