Senior Software Engineer​/Architect

Our client, a leading fintech innovator serving banks and credit unions nationwide, is seeking a Senior Software Engineer / Architect to provide technical leadership across a modern, Microsoft-centric technology ecosystem. This is a high-impact opportunity to design and deliver secure, scalable identity and integration solutions that power digital banking experiences across the U.S.

Our client is looking for a highly experienced Senior Software Engineer / Architect to lead the design and implementation of secure identity, authentication, and integration solutions across a growing platform ecosystem.

This is a hands-on engineering role with architectural ownership. The ideal candidate will drive Single Sign-On (SSO) integrations with digital banking platforms and third-party benefit providers while actively contributing to application development and delivery. This role requires deep expertise in modern .NET development, Azure cloud architecture, and enterprise identity frameworks within regulated environments.

• Lead architecture and hands-on development of secure, scalable, cloud-based software solutions
• Design and implement Single Sign-On (SSO) integrations with digital banking systems and third-party platforms
• Architect and support identity management solutions using OAuth 2.0, OpenID Connect, and SAML
• Design, implement, and maintain Identity Provider (IdP) capabilities
• Develop and manage authentication and token services leveraging Azure AD B2C and Duende Identity Server
• Collaborate with product, engineering, and external integration partners to define secure integration patterns
• Guide architectural strategy for APIs, microservices, and new feature development
• Write clean, maintainable, production-ready code within a modern Microsoft technology stack
• Mentor engineering team members and elevate development best practices
• Ensure all solutions meet security, compliance, scalability, and performance requirements—particularly within financial services environments

• 7+ years of software engineering experience with demonstrated architectural leadership
• Strong hands-on experience with:
• .NET Core / ASP.NET Core
• React
• Microsoft SQL Server
• Deep expertise in:
  
  Auth 2.0
• OpenID Connect
• SAML
• Single Sign-On (SSO) integrations
• Identity Provider (IdP) design and implementation
• Duende Identity Server (successor to Identity
  
  Server4)
• Experience building and securing APIs and microservices architectures
• Strong understanding of authentication flows, token issuance, claims-based identity, and federation
• Experience in financial services, fintech, or other regulated industries strongly preferred

• A senior-level engineer who combines architectural thinking with a passion for hands-on coding
• A leader comfortable owning identity strategy, security design, and execution
• A collaborative partner who can work effectively with banking platforms and fintech integration partners
• Strong communicator capable of explaining complex authentication and integration concepts clearly
• A pragmatic problem solver focused on security, performance, scalability, and maintainability

• Make a meaningful impact in the financial services and fintech industry
• Lead mission-critical identity and SSO integration initiatives
• Work within a modern Microsoft and Azure-based technology stack
• Collaborate with a forward-thinking team focused on innovation and growth
• Competitive compensation and comprehensive benefits package