JWT Developer at Sanderson, London Area, £650 per day

JWT / JSON Developer

Location: London - Hybrid / 2 days per week onsite

Contract Length: 6 months

Day Rate: Up to £650 a day (Outside IR35)

We're supporting a leading UK financial services organisation in the search for an experienced JWT / JSON Developer to join a high-performing engineering team on an initial 6-month contract.

This role will focus on authentication, authorisation and secure service-to-service communication across a large-scale digital platform. You'll be working on OAuth 2.0 and OpenID Connect (OIDC) implementations, JWT-based authentication, and integrations with identity providers within a modern cloud-native environment.

Key Responsibilities

• Develop and maintain authentication and authorisation services
• Implement OAuth 2.0 and OIDC integrations with identity providers
• Work with JSON Web Tokens (JWTs), including issuance, validation, signing and key management
• Contribute to CI/CD pipelines and trunk-based delivery practices
• Write and review technical documentation
• Collaborate with engineering, security and platform teams on solution design and delivery

Essential Experience

• Strong experience working with Identity Providers (IdPs)
• Solid understanding of OAuth 2.0 and OpenID Connect (OIDC)
• Hands-on experience with JSON Web Tokens (JWTs)
• Knowledge of asymmetric cryptography and secure authentication principles
• Experience with Git, CI/CD and modern software delivery practices
• Advocate of TDD and collaborative engineering approaches

Desirable Experience

• Ability to read and understand Java
• Kubernetes experience
• AWS cloud exposure