Senior Full-Stack/Platform Engineer (with AWS Cloud)

Senior Full-Stack/Platform Engineer (with AWS Cloud) Own backend and AWS infrastructure for an innovative design-to-code platform, building secure real-time WebRTC services with TypeScript, NestJS, and modern cloud tools. 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. The platform features a unique architecture where design data never passes through company servers, making privacy, security, and distributed communication critical components of the product. The environment combines modern cloud infrastructure, real-time technologies, and advanced frontend and backend development. As a Full-Stack Engineer focused on Backend and Cloud Infrastructure, you will take ownership of the platform's backend services and AWS environment, while contributing across the product stack whenever features span multiple components. 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) Requirements: 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 Main responsibilities: 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 Department Software Delivery Role Software Engineer Locations Poland (PL) Remote status Fully Remote Hourly salary PLN140 - PLN175 Employment type Full-time Skills HMI, JavaScript, NodeJS, C++, AWS Experience Senior About Spyrosoft Spyrosoft is an authentic, cutting-edge software engineering company, established in 2016. In 2021 and 2022, we were among the fastest growing technology companies in Europe, according to the Financial Times. We were founded by a group of tech experts with established backgrounds in software engineering, who created an ‘engineer-to-engineer’ workplace, powered by enthusiasm, fairness and authentic relationships. Having a unique offering, which bridge the gap between technology and business, we specialise in technology solutions for industry 4.0, automotive, geospatial, healthcare & life sciences, employee experience & education and financial services industries.