Full Stack Engineer

Lorien's leading banking client is looking for an experienced Full Stack Developer to join a major greenfield technology programme within Financial Services. You will be part of a team building a brand-new Asset Servicing platform, replacing both an existing legacy internal system and a US-based vendor solution. This is a long-term transformation programme offering the opportunity to work across modern front-end, BFF and microservices-based backend technologies. The role requires genuine full-stack development experience, although candidates can be stronger on either the front-end or backend. The ideal candidate will be a hands-on Full Stack Developer who is comfortable working across Angular/React, TypeScript/Node.js, Java microservices and SQL. You may naturally lean towards either front-end or backend engineering, but you will have sufficient experience across the stack to contribute to the end-to-end solution. Previous experience building platforms within Financial Services and particularly Asset Servicing or settlement environments would be a significant advantage. This role is based in London. This role will be Via Umbrella. Working in a Hybrid Model of 50% a week on site. Key Responsibilities Design, develop and deliver functionality across the full technology stack.Build modern user interfaces using Angular, with React experience also considered.Work within a Micro Front End (MFE) architecture.Develop Backend for Frontend (BFF) services using TypeScript and Node.js.Design and develop backend services using Java and microservices architecture.Support the migration from Java 8/11 towards Java 21/23.Develop and integrate solutions using MS SQL Server.Work closely with engineering, architecture, product and business teams to translate requirements into scalable technical solutions.Contribute to technical design, architecture decisions and engineering best practices.Support the replacement and migration away from existing legacy and vendor platforms.Technical Experience Strong commercial Full Stack Development experience.Angular development experience preferred; strong React candidates will also be considered.Experience working with Micro Front End architectures.TypeScript / Node.js, ideally within a BFF architecture.Strong Java development experience, ideally Java 8/11 and exposure to newer versions.Experience developing microservices-based applications.Strong relational database experience, ideally MS SQL Server.Experience working on complex enterprise-scale applications. Highly Desirable: Architecture and solution design experience.Experience modernising or replacing legacy technology platforms.Financial Services experience.Experience within Asset Servicing, Asset Management, Securities or Investment Banking environments.Domain Knowledge Knowledge of the asset and settlement lifecycle would be particularly beneficial, including:Asset servicing and securities processing.Settlement operations.Trade corrections and correction lifecycles.Clearing and execution.Trade booking and downstream processing.Understanding of how transactions flow across front, middle and back-office systems.