Senior Full-Stack Software Engineer with OAuth

Endava partners with leading organisations to drive meaningful change by combining AI-native engineering, industry expertise, and a people-centric mindset. They support WTW's Insurance Consulting and Technology Division, a global leader in insurance software and advisory services with over 1,700 colleagues and more than 1,000 insurers worldwide as clients.

• 6+ years of commercial software development experience using C# and modern .NET.
• Strong experience designing and developing REST APIs.
• Experience building scalable enterprise applications or shared platform services.
• Strong knowledge of object-oriented programming and modern software design principles.
• Strong understanding of OAuth 2.0, OpenID Connect (OIDC), and JWT.
• Good understanding of modern authentication and authorization concepts.
• Experience integrating applications with enterprise identity providers.
• Understanding of secure API design and identity-based access control.
• Experience developing cloud-native applications on Microsoft Azure.
• Experience with Azure DevOps, Git, and CI/CD pipelines.
• Experience using Infrastructure as Code with Terraform or OpenTofu.
• Understanding of Azure API Management or similar API Gateway technologies.
• Experience developing Angular applications using TypeScript.
• Experience building administrative or developer-facing web applications.
• Experience writing automated tests (unit, integration, API testing).
• Experience working in Agile Scrum teams.
• Strong communication and collaboration skills.
• Ability to work effectively across multiple product teams.
• Ability to influence technical outcomes, communicate delivery risks, and contribute to decisions.

Preferred Skills and Experience:

• Auth0
• Fine-Grained Authorization (FGA)
• Google Zanzibar authorization model
• Azure API Management (APIM)
• SCIM integrations
• Identity Federation
• Datadog
• Playwright
• Trivy
• GitLeaks
• Invicti
• Experience building reusable developer platforms
• Experience working with enterprise shared services

Identity Platform Development:

• Design, develop, and maintain authentication and authorization services using modern .NET technologies.
• Develop reusable platform services supporting secure authentication and authorization across multiple business applications.
• Build scalable REST APIs and integration services.
• Develop and maintain Angular-based administration portals.
• Contribute to Fine-Grained Authorization (FGA) and centralized access management.

Platform Services & Developer Experience:

• Develop reusable SDKs, libraries, and APIs simplifying integration with the identity platform.
• Build developer tooling to improve onboarding and adoption.
• Produce and maintain technical documentation.
• Design stable platform interfaces to minimize breaking changes.
• Lead technical work packages and guide other engineers.

Cloud & Platform Engineering:

• Develop cloud-native services on Microsoft Azure.
• Build and maintain reverse proxy capabilities using Azure API Management.
• Support Infrastructure as Code with OpenTofu/Terraform.
• Contribute to CI/CD pipelines using Azure DevOps.
• Improve platform scalability, security, and resilience.

Engineering Excellence:

• Write unit, integration, and automated tests.
• Participate in peer reviews and technical design sessions.
• Promote best practices including Clean Code and secure software development.
• Collaborate with cross-functional teams.
• Mentor less experienced engineers.

Operations & Collaboration:

• Participate in third-line production support and on-call rotation.
• Investigate production issues.
• Collaborate with multiple product teams.
• Support long-term platform ownership.