Senior Full Stack Engineer – Typescript, C#, AWS, IAM, SecurityOutstanding opportunity to join this global B2B SaaS leader as a Senior Full Stack Engineer with some security and IAM exposure required to develop APIs to connect their IAM solution to their core applications. This permanent role offers the chance to shape how full stack applications embrace Zero Trust authentication and authorization services in a cutting-edge, AI-driven environment.About the RoleBuild full-stack APIs and integrations in TypeScript, C#, AWS IAMDeliver 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 responseRequired experienceStrong full-stack development skills (TypeScript, C#, AWS)An in-depth security mindset with an understanding of Zero Trust & OAuth2Proven experience with OIDC-compliant IDPs (Auth0, Okta, Cognito)Solid AWS expertise (IAM, Lambda, API Gateway, CDK)A proven background in building RESTful APIs that interact with IDPsSecurity-first mindset with experience in secure coding, threat modelling, and protecting PIIAbility to mentor, collaborate, and lead with hands-on problem-solving£85k-£90k + bonus + benefits. 95% remote & London #J-18808-Ljbffr