Senior Full-Stack/Platform Engineer with AWS Cloud

• Strong commercial experience with TypeScript and Node.js development
• Proven experience building and maintaining backend services using NestJS
• Hands-on expertise with PostgreSQL, Redis, and modern API architectures
• Solid AWS experience, including ECS Fargate, RDS, ElastiCache, S3, and load balancers
• Experience with Infrastructure as Code, preferably AWS CDK in TypeScript
• Strong CI/CD knowledge, including GitHub Actions and multi-environment deployment pipelines
• Experience with cloud authentication mechanisms such as OIDC role assumption
• Production-focused mindset with attention to scalability, monitoring, security, and reliability
• Experience implementing observability solutions and monitoring tools
• Strong understanding of distributed systems and real-time communication technologies
• Experience writing automated tests and maintaining high-quality CI pipelines
• Good communication skills and ability to work across backend, infrastructure, and frontend domains
• Fluent English - C1 level

Nice to have:

• Experienced in using AI tools in day-to-day workflow
• Experience with Playwright or similar end-to-end testing frameworks
• Knowledge of browser automation and CI stability improvements
• Experience with WebRTC data channels and peer-to-peer architectures
• Familiarity with OAuth2, JWT authentication, refresh token rotation, and reuse detection
• Experience with C++ and Qt/QML
• Knowledge of WebAssembly and Emscripten build environments
• Experience maintaining complex build and deployment pipelines

This is a technically strong freelance opportunity that combines backend ownership with modern AWS infrastructure and real-time communication technologies. I've structured it according to your preferred recruitment template.

Project description:

Our client is developing an innovative design-to-code platform that converts Figma designs into production-ready QML code for Qt Desktop and Qt for MCUs. The solution includes a Figma plugin, a React-based live preview application, backend services, and a WebRTC signaling layer enabling fully peer-to-peer preview sessions.

Tech stack:

• TypeScript, Node.js 24, NestJS (Fastify), React 18
• Vite
• Prisma
• Redis
• Socket.IO
• WebRTC
• AWS (ECS Fargate, ALB, RDS, ElastiCache, S3, Amplify), AWS CDK
• GitHub Actions, Docker
• Sentry
• Tailwind CSS
• C++17
• Qt 6 / QML
• WebAssembly (Emscripten)

,[Design, develop, and maintain backend services built with NestJS, Fastify, PostgreSQL, Prisma, Redis, and S3, Develop and enhance the WebRTC signaling server using NestJS, Socket.IO, and Redis, Own and evolve AWS infrastructure using CDK, including ECS Fargate, ALBs, RDS, ElastiCache, S3, and Amplify, Manage and improve CI/CD pipelines using GitHub Actions across development, staging, and production environments, Ensure platform reliability through monitoring, health checks, rate limiting, security controls, and observability practices, Implement and maintain distributed coordination mechanisms such as Redis-based locking, Improve WebRTC communication reliability, including connection handling, backpressure management, and chunked file transfers, Contribute to frontend development in React and collaborate on cross-functional product features, Build and maintain automated unit, integration, and end-to-end test suites, Optimize deployment workflows and support release automation processes, Collaborate with product and engineering teams to deliver scalable and high-quality solutions, Continuously improve platform performance, maintainability, and operational excellence] Requirements: TypeScript, Node.js, PostgreSQL, Redis, API, AWS, ECS, AWS ECS, AWS Fargate, Amazon RDS, ElastiCache, AWS S3, Infrastructure as Code, GitHub Actions, Cloud, Security, CD, AWS CDK, AI, Playwright, Testing, WebRTC, C++, Qt, WebAssembly, Emscripten