Senior Full-Stack Software Engineer with OAuth

About the Position

We are looking for a Senior Full-Stack Software Engineer with OAuth to join our team at Endava, working in partnership with WTW. This role is pivotal in building secure, reusable authentication and authorization services for WTW's Insurance Consulting and Technology Division.

Responsibilities

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 used throughout the organization.
• Develop and maintain Angular-based administration portals supporting user, group, and permission management.
• Contribute to the evolution of Fine-Grained Authorization (FGA) capabilities and centralized access management services.

Platform Services & Developer Experience

• Develop reusable SDKs, libraries, and APIs that simplify integration with the enterprise identity platform.
• Build developer tooling that improves onboarding and adoption of shared authentication services.
• Improve developer experience by simplifying authentication, authorization, and platform integration.
• Produce and maintain technical documentation supporting engineering teams consuming the platform.
• Take ownership of technical designs and implementation approaches for assigned capabilities, identifying dependencies, risks, and trade-offs and following work through to a production-ready outcome.
• Lead focused technical work packages and provide practical guidance to other engineers contributing to the same capability.

Cloud & Platform Engineering

• Develop cloud-native services running on Microsoft Azure.
• Build and maintain reverse proxy capabilities using Azure API Management.
• Support Infrastructure as Code implementation using OpenTofu/Terraform.
• Contribute to CI/CD pipelines and deployment automation using Azure DevOps.
• Support continuous improvements in platform scalability, security, and operational resilience.

Engineering Excellence

• Write unit, integration, and automated tests ensuring platform quality and reliability.
• Participate in peer reviews, architecture discussions, and technical design sessions.
• Promote engineering best practices including Clean Code, automated testing, and secure software development.
• Collaborate with Product Owners, Architects, QA Engineers, and Platform Engineers to deliver high-quality platform capabilities.
• Support less experienced engineers through constructive reviews, knowledge sharing, and technical mentoring.

Operations & Collaboration

• Participate in third-line production support and on-call rotation.
• Investigate production issues and contribute to platform reliability improvements.
• Work closely with multiple product teams integrating with the platform.
• Share knowledge and contribute to establishing long-term Endava ownership of the Authentication & Authorization capability.

Requirements

Software Engineering

• 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.

Identity & Security

• 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.

Cloud & Platform Engineering

• 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.

Front-End Development

• Experience developing Angular applications using TypeScript.
• Experience building administrative or developer-facing web applications.

Engineering Practices

• Experience writing automated tests (unit, integration, and 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 across team boundaries, communicate delivery risks, and contribute to decisions affecting shared platform consumers.

Nice to Have

• 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

We Offer

• Gross base salary starting from PLN 19,267 PLN Gross per month (full-time employment contract).
• Benefits including private medical insurance, dental plan, and glasses reimbursement.
• An inclusive and respectful work environment.
• Opportunities for professional growth and development.

About the Company

At Endava, we harness technology to drive meaningful change. By combining AI-native engineering, deep industry expertise, and a people-centric mindset, we partner with leading organizations to solve complex business challenges and create digital products and platforms that make a lasting impact.

From strategy and design to engineering and operations, we help our customers accelerate innovation and transform their businesses. Join us and be part of a global team delivering work that matters.