Senior Backend Developer (Node.js/TypeScript) - London (Hybrid working applies) Are you an experienced Back End developer with a passion for building secure, high-performance systems in the cloud? We''re looking for a Senior Node.js Engineer to help shape the future of Embedded commerce experiences. You''ll be part of a small, high-impact engineering team building cloud-native, serverless infrastructure for Real Time transaction processing. If you''re excited by working on secure payment systems, third-party integrations, and regulated environments, this is a chance to build technology that truly makes an impact. Your role will involve: Expanding and maintaining a serverless payment processing platform built with TypeScript, Node.js, and AWS services like Lambda, API Gateway, and DynamoDB. Ensuring continued PCI DSS compliance across the full development life cycle, including patching, error tracing, and applying secure coding practices. Designing secure, well-documented service interfaces and abstractions over external APIs used by our clients. Participating in Agile ceremonies, collaborating closely with engineering, infrastructure, and external service providers. Practising Test-Driven Development (TDD) and Behaviour-Driven Development (BDD) to maintain a high standard of code quality, resilience, and performance. We are looking for candidates who have: Strong hands-on experience with TypeScript and Node.js for Back End development. Deep understanding of AWS serv