Senior IAM Engineer (Full Stack) - OAuth2, AWS IAM, React, Node.js, C#

Senior IAM Engineer (Full Stack) - OAuth2, AWS IAM, React, Node.js, C#

Join a global B2B SaaS leader as a Senior Full Stack IAM Engineer, driving secure, scalable identity and access management across multiple products. This permanent role offers the chance to shape authentication and authorization services in a cutting-edge, AI-driven environment.

About the Role:

• Own the IAM platform, designing and operating OIDC-compliant IDPs (Auth0, Okta, Cognito)
• Build full-stack features in TypeScript, Node.js, React, and C#/.NET
• Deliver secure login, SSO, MFA, RBAC/ABAC, and tenant isolation at scale, leveraging AWS services (Lambda, IAM, CloudFront, API Gateway, CDK)
• Collaborate across Product, Security, and Engineering teams, embed identity into new features, and uphold engineering excellence through CI/CD, testing, and incident response

Required experience:

• Strong full-stack skills (TypeScript/Node.js, React, C#/.NET)
• Proven experience with OIDC-compliant IDPs (Auth0, Okta, Cognito)
• Deep knowledge of auth standards (OAuth2, OIDC, SAML, JWTs)
• Solid AWS expertise (IAM, Lambda, API Gateway, CDK)
• Security-first mindset with experience in secure coding, threat modelling, and protecting PII
• Ability to mentor, collaborate, and lead with hands-on problem-solving

£Market + bonus + benefits. 95% remote & London