Senior Lead Full Stack Developer (Entra ID/API)

At Sparq , we help companies solve the right problems—not just build more technology.

We’re a modern product engineering partner blending strategy, craftsmanship, and speed to help organizations modernize confidently in the age of AI. From data ecosystems to digital products and AI acceleration, we turn complexity into clarity and ideas into impact.

If you’re driven to build what’s next, lead with empathy, and deliver excellence without ego, you’ll feel right at home at Sparq .

Why you will enjoy Mondays again:

- Opportunity to work alongside a talented, diverse team in a collaborative and creative environment

- Ongoing investment in your growth through training, mentorship, and industry certifications

- Hands-on exposure to cutting-edge technologies across multiple industries

- Recognition programs and employee awards within an inclusive culture that celebrates great work, including our AI Innovators Program

- Remote or hybrid work options

A Day in the Life:

- Design, build, and maintain secure backend APIs using C#, .NET Core/.NET 6+, and ASP.NET Core, with a focus on authentication, authorization, and secure service communication.

- Implement and support Entra ID/Azure AD authentication flows, including OAuth, JWT, managed identities, and token-based access patterns across backend services and web applications.

- Help modernize existing systems by supporting migration efforts to Entra ID and Azure-based identity solutions, while identifying opportunities to improve API security and application architecture.

- Partner closely with senior architects and engineering teams to align development work with established security standards, cloud architecture patterns, and Azure best practices.

- Actively use AI tools, including Claude through our Anthropic partnership, to streamline tasks, improve the quality of your work, and share best practices with teammates while continuously seeking new ways to integrate AI into your everyday workflows

- Collaborate with front-end developers using Vue.js, React, or Angular to support authentication flow design and ensure backend identity patterns integrate effectively with the user experience.

- Develop and enhance secure service-to-service integrations within a distributed or microservices-based environment, ensuring APIs are reliable, scalable, and protected.

- Troubleshoot authentication issues across backend services and front-end applications, helping ensure login, access, token handling, and authorization flows work smoothly for end users.

- Contribute to technical design discussions, code reviews, and system improvements with an emphasis on clean code, secure development practices, and long-term maintainability.

What it takes:

- Availability to work within US Mountain Time hours

- Consultative approach and problem solving skills to successfully align digital solutions with long-term business goals of the client

- Hands-on experience using AI tools to enhance daily work, or a strong desire to do so, including a willingness to experiment, learn, and champion AI adoption within your role

- Claude Certified Developer or Architect highly preferred; possible opportunity to obtain as a Sparq colleague

- Commitment to understanding and exceeding client expectations

- Ability to perform project oversight and execution of deliverables

- Flexibility to adapt within a high-growth organization

- Ability to lead, mentor and motivate those around them

- Hunger for continuous learning and professional development

- Intellectual curiosity to provide creative solutions

- Full understanding of the software development life cycle

- Ability to positively impact fellow colleagues through effective leadership, presentations, coaching, etc.

- Desire to work in a team environment

- Good interpersonal, written and verbal communication skills

Regardless of your specific role, we seek individuals who are excited to explore, adopt, and evangelize AI tools and methodologies.