Senior Software Engineer

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by diversity and inclusion, talented peers, comprehensive benefits and career development opportunities.

Come make an impact on the communities we serve as you help us advance health equity on a global scale. Join us to start

Caring. Connecting. Growing together.

The Senior Developer designs, builds, and supports scalable internal and external-facing API solutions using the .NET technology stack. This role partners with product owners, users, and engineering peers to deliver secure, reliable, and maintainable software in an Agile environment, with strong focus on architecture, testing, performance, and production support.

You will enjoy the flexibility to telecommute
* from anywhere within the U.S. as you take on some tough challenges.

• Design, develop, and maintain highly scalable internal and external-facing APIs using .NET Core / ASP.NET Web API
• Collaborate with product owners and users to evaluate requirements by analyzing business needs, system workflows, data points, and integration boundaries with other enterprise applications
• Translate requirements into well-structured technical designs, API contracts, and implementation plans with attention to scalability, performance, and maintainability
• Develop and maintain unit and integration tests for new features, and add tests to legacy code where necessary to reduce risk and improve coverage
• Ensure code, configurations, and deployments support scalability, resiliency, and operational readiness in production environments
• Support production users by monitoring services, investigating incidents, and resolving ticketed issues; provide root-cause analysis and preventative fixes
• Perform code reviews and contribute to defining and enforcing coding standards, best practices, and consistent design patterns across the team
• Participate across the full development lifecycle—from concept and design through implementation, testing, deployment, and post-release support
• Actively participate in Agile ceremonies (daily standups, planning, refinement, retrospectives) to communicate progress, risks, and dependencies
• Continuously improve technical skills by staying current with modern development tools, programming techniques, and engineering practices

You'll be rewarded and recognized for your performance in an environment that will challenge you and give you clear directions on what it takes to succeed in your role as well as provide development for other roles you may be interested in.

• 8+ years of professional software development experience with strong backend/API focus
• 5+ years of experience with the .NET technology stack, including C#, ASP.NET MVC, and ASP.NET Web API / .NET Core
• 5+ years of experience with database design and writing complex T‑SQL queries (SQL Server or equivalent)
• 5+ years of experience writing unit tests and integration tests and maintaining testable code
• 5+ years of experience and hands‑on application of SOLID principles and clean coding practices
• 5+ years of experience with modern web application and service design patterns such as Clean Architecture and/or Vertical Slice Architecture, event‑driven design, and asynchronous processing
• 5+ years of experience working in an Agile environment using Scrum or Kanban

• Experience with observability/monitoring tools and production support practices (alerting, dashboards, log analysis
• Experience designing secure APIs (authentication/authorization, OWASP considerations, rate limiting, input validation
• Familiarity with CI/CD pipelines and automated quality gates

• Self‑motivated, able to work in minimal direction, and able to manage multiple priorities effectively
• Strong analytical, problem‑solving, and critical thinking skills
• Excellent communication skills with the ability to explain technical concepts to both…