As a Senior Full-Stack Engineer on our new UK-based team, you will help us build a financial B2B SaaS platform using TypeScript, React, and Node.js. Youll tackle our unique challenge: ensuring high performance on an application that handles complex financial calculations and large datasets. With a 60/40 backend-to-frontend focus, this role is perfect for a proactive engineer who is passionate about building high-performance software throughout the stack and thrives in a multicultural environment. This is a fantastic opportunity to grow your skills while shaping up a new team and a cutting-edge platform. This is a hybrid position - working 3 days a week from our Winnersh office. Key Responsibilities • Take full ownership of the feature development lifecycle, from concept and design to testing and deployment. • Collaborate with product managers, designers, and other SW Engineers to translate requirements into well-architected, user-friendly features. • Write clean, scalable, and high-performance code for both the backend (Node.js) and the frontend (React/TypeScript) • Collaborate with field teams to support our customers, debug issues, and offer prompt solutions. • Participate in code reviews and contribute to the continuous improvement of our development processes. • Improve the performance, scalability and security of the platform. • Develop and maintain comprehensive tests to ensure software quality and reliability • Contribute to our Node.js and AWS backend services. • Stay up-to-date with the latest trends in web development and cloud-based SaaS technologies. Required Qualifications: • 5 years of professional experience in software development for scalable, web-based applications. • Experience in building large-scale, maintainable applications, with proficiency in TypeScript/JavaScript. • Proven experience building and maintaining backend services with Node.js and a common framework (e.g., Fastfy, Express, NestJS). • JavaScript performance optimization. You know how to profile, debug, and refactor code to make it faster. • Experience in modern frontend frameworks (e.g., React, Vue, Svelte). • Experience with AWS infrastructure. • Experience with CI/CD pipelines. • Bachelor’s degree in Computer Science, Software Engineering, or a related field from a university or a leading college. Bonus Points: • Experience with Browser DB (IndexedDB) and Sync Engine pattern. • Experience with data-intensive applications or financial modeling. Soft Skills: • Strong problem-solving abilities and an eagerness to learn. • Excellent communication skills and the ability to work well in a multicultural environment. • High attention to detail and a commitment to delivering high-quality work.