https://jobs.co.uk/job/senior-engineer-identity-amp-token-security-opus-recruitment-solutions--7f1d2074-1f97-4917-ad4d-5ebc57c7e883 RSS feed for Senior engineer - Identity & Token Security at Opus Recruitment Solutions. en-gb Tue, 28 Jul 2026 21:07:28 GMT https://jobs.co.uk/job/senior-engineer-identity-amp-token-security-opus-recruitment-solutions--7f1d2074-1f97-4917-ad4d-5ebc57c7e883 https://jobs.co.uk/job/senior-engineer-identity-amp-token-security-opus-recruitment-solutions--7f1d2074-1f97-4917-ad4d-5ebc57c7e883 Mon, 27 Jul 2026 23:00:00 GMT Location: London | Salary: £550 - £600/day Remote - Once or twice a month onsite | Type: Contract | Senior Engineer - Identity & Token Security Rate: -550 day Outside IR35 Start Date: ASAP End Date: 18/12/2026 Active SC Clearance Location: Remote/Hybrid (UK-based) Responsibilities Design and implement OAuth 2.0 Token Exchange (RFC 8693) capabilities. Develop secure identity delegation and propagation patterns across distributed services. Implement token down-scoping and audience restriction mechanisms aligned to least-privilege principles. Design secure service-to-service authentication frameworks within zero-trust environments. Build and maintain robust JWT validation and cryptographic trust chains. Integrate applications and services using OpenID Connect (OIDC) standards Essential: OAuth 2.0 & Identity Standards Proven hands-on implementation experience with OAuth 2.0 Token Exchange (RFC 8693). Strong understanding of OpenID Connect (OIDC) core specifications. Expert-level understanding of JWT (RFC 7519). Experience signing, validating and encrypting tokens using JWS and JWE. Strong knowledge of JWKS endpoints and automated key rotation strategies. Understanding of secure alternatives to shared-secret authentication mechanisms. Experience securing service-to-service communica... Contract