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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - Client Identity (Backend) - **Company:** Vanguard - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Amazon Web Services, Amazon Cloudfront, Amazon S3, User Authentication, Authentication Protocols, Automation of Tests, Cloud Computing, Code Coverage, Continuous Integration, DevOps, Amazon DynamoDB, Github, Identity and Access Management, PostgreSQL, Node.Js, OAuth, TypeScript, Datadog, Grafana, Backend, Git, Cloudformation, Database Migration, Integration Tests, Functional Programming, Api Gateway, NestJS, Restful APIs, Terraform, Web Api, Microservices - **Published:** July 30, 2026 - **Apply:** http://www.vanguardjobs.com/job/23445800/senior-software-engineer-client-identity-backend-london-gb/?utm_medium=%22mcloud%2Djobads%22&utm_campaign=Default%20Campaign&utm_content=Senior%20Software%20Engineer%20%96%A0Client%20Identity%A0%28Backend%29%A0&utm_term=178611 ## About the Role * Expertise in TypeScript * Strong backend engineering fundamentals with Node.js and NestJS or Express * Experience designing and building REST APIs * Understanding of authentication protocols: OAuth 2.0, JWT * Hands-on experience with AWS (ECS, Lambda, CloudFront, S3, Secrets Manager) * Familiarity with Infrastructure as Code (CloudFormation or CDK/Terraform) * Strong Git practices and CI/CD experience (GitHub Actions or similar) * Experience writing unit and integration tests (Jest) Nice to Have * Experience with identity, authentication, or MFA systems * Familiarity with Kong API Gateway or similar * Exposure to Aurora PostgreSQL or DynamoDB * Knowledge of microservices architectures * Exposure to security concepts (IAM, encryption, networking) * Experience with observability tooling (OpenTelemetry, Honeycomb, Grafana) ## Description 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 mainly contribute across backend APIs, Cloud Infrastructure, and DevOps. 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 backend fundamentals, cloud experience, and a responsible, methodical engineering mindset. In this role you will * Build and evolve backend services that support client authentication and MFA * Design and implement REST APIs using NestJS / TypeScript * Integrate with identity and MFA platforms (e.g. Transmit Security, Auth0) * Deploy and operate services on AWS, using CloudFormation/CloudBlocks * 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 ## Related Videos - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Git for Code Reviews](https://www.wearedevelopers.com/videos/429-git-for-code-reviews) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)