Senior Fullstack Engineer | Tax Technology and Operations | Stockholm

The opportunity We are looking for a great colleague to join our EY Tech People team as a Senior Fullstack Engineer, where you will play a pivotal role in building innovative tax automation tools and AI-integrated platforms across several business-critical products. Our mission is to enhance efficiency, quality, and satisfaction in tax and compliance workflows, serving thousands of clients with accurate and compliant tax filings. As part of a dynamic organization operating across the Nordics (DK, FI, SE, NO), you will collaborate with a talented group of engineers, designers, researchers and product managers in a flat, informal structure. While experience in tax law is beneficial, a passion for technology and collaboration is what we truly value. Your key responsibilities Building end-to-end tax automation features from React frontends to Node.js backends Developing AI-integrated platforms with seamless user experiences and robust data processing Close collaboration with designers, product managers, and fellow developers as well as sparring with users and researchers to understand tax workflows in detail Contributing to internal tooling and developer experience, including AI-assisted development workflows, MCP server implementations, and prompt libraries Working across a range of products and problem spaces in the fullstack domain Skills and attributes for success Frontend Expertise (Required): React/TypeScript: Extensive experience with modern hooks, state management, and performance optimization Modern Tooling: Experience with build tools (Vite/webpack), testing frameworks (Cypress/Playwright), and Kubernetes deployments Complex UI Development: Building multi-step workflows, sophisticated form validation, and responsive interfaces Backend Proficiency (Required): Node.js: Extensive experience with Express, async programming, and RESTful API development MongoDB: Strong experience with document design, aggregation pipelines, and performance