SeniorSoftwareEngineer-Identity&Authentication

Project Contractor **About the Role** In the European Client Identity team, we are building and operating Vanguard's authentication and MFA platform used by hundreds of thousands of clients across the UK and Europe. This is a hands-on senior full-stack role focused on designing, building, deploying, and operating cloud-based identity services. You will contribute across backend APIs, cloud infrastructure, and frontend experiences — with React as the preferred frontend framework for new UI work. You will work in a highly regulated environment where security, reliability, and operational discipline matter. You don't need to be an identity expert on day one — but you do need strong full-stack fundamentals, cloud experience, and a responsible, methodical engineering mindset. **What You’ll Do** • Build and evolve backend services that support login, MFA, and client authentication • Design and implement REST APIs using NestJS / TypeScript • Build frontend experiences using React where new UI development is required • Integrate with identity and MFA platforms (e.g. Transmit Security, Auth0) • Deploy and operate services on AWS, using Infrastructure as Code • Run and maintain services in production, including: ○ Database migrations and updates ○ Manage vendor-specific software services running in AWS • Write automated tests and contribute to improving test coverage and quality • Participate in CI/CD pipelines, deployments, and operational procedures • Work closely with product and security stakeholders to translate requirements into technical solutions • Continuously improve engineering standards, tooling, and reliability **What We’re Looking For (Must-Have)** • Strong backend engineering fundamentals with Node.js and NestJS or Express • TypeScript across frontend and backend • Experience designing and building REST APIs • Understanding of authentication protocols: OAuth 2.0, JWT, MFA flows • Hands-on experience with AWS (ECS, Lambda, CloudFront, S3, Secrets Manager) • Fami