Senior .NET Full Stack Developer (Auth0 & CIAM Focus)

• The client is a leading multi-brand technology solutions provider to business, government, education and healthcare customers in the United States, the United Kingdom and Canada. A Fortune 500 company and member of the S&P 500 Index, the company was founded in 1984 and employs approximately 14,900 coworkers.
• You will be joining a cross-functional team focused on modernizing our customer identity and access management (CIAM) capabilities using Auth0. The project involves building secure, scalable web applications that integrate with Auth0 for authentication, authorization, and user lifecycle management. You'll work on implementing SSO, OAuth2, and federated identity protocols like OIDC and SAML2, while ensuring seamless user experiences and compliance with security best practices. This is a high-impact initiative involving migration of our existing authentication APIs to the new Auth0 based CIAM system; deep understanding and previous working experience working with Auth0 is one of the key requirements.

Requirements:

• Required Skills & Experience:
• 5-8 years of experience as a Full Stack .NET Developer.
• Strong proficiency in .NET 6/8, C#, ASP.NET Core, and React.
• Hands-on experience with Auth0 for CIAM implementation.
• Solid understanding of JWT, OIDC, and SAML2 protocols.
• Experience with Azure cloud services and DevOps pipelines.
• Familiarity with microservices architecture and enterprise-grade application development.
• Strong problem-solving skills and ability to work independently in a fast-paced environment.
• Working hours: 11 am – 8 pm CET

Preferred Qualifications:

• Experience integrating Auth0 with third-party identity providers (e.g., Azure AD, Google, Okta).
• Background in eCommerce or customer-facing platforms.
• Knowledge of secure coding practices and compliance standards.

Responsibilities:

• Design, develop, and maintain full-stack web applications using .NET 6/8, C#, and React/JavaScript.
• Implement and manage CIAM features using Auth0, including Single Sign-On (SSO), OAuth2, and user lifecycle management.
• Integrate JWT, OpenID Connect (OIDC), and SAML2 protocols into application authentication flows.
• Develop and secure RESTful APIs, ensuring robust identity and access control.
• Collaborate with cross-functional teams to translate business requirements into secure and scalable technical solutions.
• Participate in code reviews, unit testing, and deployment processes in Azure environments.
• Optimize application performance and ensure adherence to security best practices.
• Maintain comprehensive documentation for development processes, Auth0 configurations, and CIAM architecture.