Senior Node.js Backend EngineerContract: 12 monthsHours: UK/CETRate: $300 USD per dayLocation: Fully RemoteOverviewWe’re looking for a Senior Backend Engineer to take ownership of core platform services, helping evolve an existing AWS-based system into a more scalable, modular architecture. This is a hands-on product backend role with real responsibility over performance, reliability, and system design.What you’ll doMigrate existing serverless logic into a modular NestJS backendBuild and maintain backend services using Node.js, TypeScript, and NestJSLead MySQL / Aurora performance optimisation (queries, indexing, scaling, reliability)Improve system scalability and stability across AWS infrastructureContribute to observability (Grafana) and infrastructure-as-code (Terraform)Work closely with product and engineering to ship high-quality backend featuresTech StackNode.js, NestJS, TypeScriptMySQL (Aurora), RedisAWS (ECS, Lambda, SQS, API Gateway, S3, CloudFront)Terraform, GrafanaMust have5+ years commercial backend experienceStrong Node.js + NestJSSolid MySQL optimisation experience in production environmentsDeep AWS hands-on experienceComfortable using AI dev tools day-to-day (Copilot / Claude / similar)