Senior Node.js Backend Engineer

Senior Node.js Backend Engineer **Contract:** 12 months **Hours:** UK/ **CET** **Rate:** $300 USD per day **Location:** Fully Remote Overview We’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 do * Migrate existing serverless logic into a modular **NestJS** backend * Build and maintain backend services using **Node.js, TypeScript, and NestJS** * Lead **MySQL / Aurora performance optimisation** (queries, indexing, scaling, reliability) * Improve system scalability and stability across AWS infrastructure * Contribute to observability (Grafana) and infrastructure\-as\-code (Terraform) * Work closely with product and engineering to ship high\-quality backend features Tech Stack * Node.js, NestJS, TypeScript * MySQL (Aurora), Redis * AWS (ECS, Lambda, SQS, API Gateway, S3, CloudFront) * Terraform, Grafana Must have * 5\+ years commercial backend experience * Strong Node.js \+ NestJS * Solid MySQL optimisation experience in production environments * Deep AWS hands\-on experience * Comfortable using AI dev tools day\-to\-day (Copilot / Claude / similar)