Software Engineer – React and Dot Net

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 inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health optimization on a global scale. Join us to start Caring. Connecting. Growing together.

The Sr Software Engineer will be responsible for designing, implementing, and maintaining efficient APIs, building responsive and dynamic user interfaces, and managing databases. This role requires a solid understanding of .Net API development, front-end development using React, object-oriented programming principles, database management, and version control systems.

Build, ship, and maintain React front‑ends and .NET (C#) APIs that power Defensive AI capabilities (fraud/anomaly workflows, SME review tools, and platform integrations). Collaborate with Data Engineering and Data Science to turn detection insights into secure, scalable, user‑friendly applications used by supervisors and SMEs in the Defensive AI workflow

Primary Responsibilities:

• .Net API Development: Design, implement, and maintain efficient APIs using .Net technologies.
• Front-End Development using React: Build responsive and dynamic user interfaces using React.
• Object-Oriented Programming (OOP): Apply solid understanding of OOP principles and design patterns in software development.
• Database Management: Manage and query databases effectively using SQL Server or other relational databases.
• Version Control Systems: Use version control systems like Git for code management and collaboration.
• Comply with the terms and conditions of the employment contract, company policies and procedures, and any and all directives (such as, but not limited to, transfer and/or re-assignment to different work locations, change in teams and/or work shifts, policies in regards to flexibility of work benefits and/or work environment, alternative work arrangements, and other decisions that may arise due to the changing business environment). The Company may adopt, vary or rescind these policies and directives in its absolute discretion and without any limitation (implied or otherwise) on its ability to do so

Required Qualifications:

• Hands‑on experience with .NET API development (C#, ASP.NET Core), with strong OOP and design‑pattern fluency
• Experience with database management, particularly SQL Server or other relational databases
• Experience with Copilot to improve efficiency and effectiveness in development tasks
• Experience with cloud solutions and services
• Experience with Git and CI practices 
• Solid knowledge of .Net API development
• Familiarity with both front-end and back-end development tools and techniques
• Knowledge of software development life cycle (SDLC) and agile methodologies
• Solid understanding of object-oriented programming principles and design patterns
• React proficiency (hooks, component composition, state management, testing)
• Proficiency in front-end development using React
• Proficiency in using version control systems like Git
• Demonstrated ability to consume/produce RESTful APIs and integrate with internal platforms or services
• Proven SQL skills for querying and integrating with application data stores; comfort wiring APIs to downstream data services owned by Data Engineering
• Proven solid problem-solving skills and attention to detail
• Proven excellent written and verbal communication skills

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes – an enterprise priority reflected in our mission.