Senior Fullstack Engineer (Node.js/AWS/AI-Native) - Portugal Full Remote

Senior Fullstack Engineer (Node.js/AWS/AI-Native) - Portugal Full Remote ABOUT THE OPPORTUNITY Are you an engineer who already builds with AI coding agents every day? We’re looking for an AI-native Senior Fullstack Engineer to own the design, build and scaling of production-grade software for a well-established UK digital retail and financial services company. AI tools are a core part of this role, not an occasional extra. You’ll use Claude Code, Cursor and similar agents to plan, build, test, debug and ship high-quality software quickly, and you’ll stay fully accountable for every line that goes to production. PROJECT & CONTEXT Our client is a recognised UK player in retail, payments, credit, fraud and financial services. The business is in the middle of a major technology transformation and is investing heavily in modern cloud platforms and AI-driven development. You’ll work mainly with Node.js, TypeScript and AWS, building backend services and integrations across commercial platforms, payments, fraud, originations and financial infrastructure. Your work will cover: Designing and maintaining scalable, secure backend services and REST APIs Integrating third-party platforms and SaaS solutions Deploying, monitoring and scaling applications on AWS Reviewing and validating AI-generated code for security, performance and maintainability Refactoring and modernising existing services Building automated testing, CI/CD pipelines and observability Troubleshooting production issues