Full Stack .NET Application Engineer

UST is searching for a Full Stack .NET Application Engineer responsible for designing, developing, modernizing, and supporting enterprise applications built on Microsoft technologies. The role collaborates with business stakeholders, architects, infrastructure teams, and support organizations to deliver scalable, secure, and high-performing solutions while supporting application modernization and migration initiatives.

What You’ll Do

• Application Development

• Design, develop, and maintain applications using C#, ASP.NET, .NET Framework 4.x, .NET 8/10, and Angular.

• Develop APIs, integrations, and reusable application components.

• Translate business requirements into scalable technical solutions.

• Application Modernization & Migration

• Assess and modernize legacy applications.

• Support application migration, platform upgrades, and cloud readiness initiatives.

• Testing & Quality

• Develop and execute unit and integration tests.

• Support SIT, UAT, deployment validation, and defect resolution.

• Production Support

• Provide Level 3 support for critical business applications.

• Troubleshoot application, integration, and performance issues.

• DevOps & Automation

• Contribute to CI/CD pipeline implementation and deployment automation.

• Implement monitoring, logging, and observability solutions.

• Documentation & Knowledge Management

• Maintain technical documentation, deployment guides, and support runbooks.

• Support knowledge transfer and adherence to development standards.

This position description identifies the responsibilities and tasks typically associated with the performance of the position. Other relevant essential functions may be required.

• ASP.NET MVC / ASP.NET Core

• .NET Framework 4.x

• .NET 8/10

• Angular

• HTML5, CSS3, JavaScript, TypeScript

• REST API Development

• Microsoft SQL Server and T-SQL

• Git and Azure DevOps

• IIS and Windows Server

• PowerShell

• CI/CD and DevOps Practices

• Application Performance Tuning

• Strong Problem Solving and Communication Skills

• Experience with application modernization and migration programs.

• Experience with cloud services.

• Knowledge of ServiceNow, PowerShell, and automation tools.

• Experience supporting healthcare, insurance, or benefits administration platforms.

• Bachelor’s degree in computer science, Engineering, or a related field.

• 5+ years of enterprise application development experience.

• Full Stack Development

• Application Modernization

• Technical Leadership

• Incident Resolution & Root Cause Analysis

• Stakeholder Collaboration

• Agile Delivery & Continuous Improvement

Compensation can differ depending on factors including but not limited to the specific office location, role, skill set, education, and level of experience. UST provides a reasonable range of compensation for roles that may be hired in various U.S. markets as set forth below., Full-time, regular employees accrue a minimum of 10 days of paid vacation per year, receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year), 10 paid holidays, and are eligible for paid bereavement leave and jury duty. They are eligible to participate in the Company’s 401(k) Retirement Plan with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance, as well as the following Company-paid Employee Only benefits: basic life insurance, accidental death and disability insurance, and short- and long-term disability benefits. Regular employees may purchase additional voluntary short-term disability benefits, and participate in a Health Savings Account (HSA) as well as a Flexible Spending Account (FSA) for healthcare, dependent child care, and/or commuting expenses as allowable under IRS guidelines. Benefits offerings vary in Puerto Rico.

Part-time employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company’s 401(k) Retirement Plan with employer matching.

Full-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company’s 401(k) program with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance.

Part-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year).

All US employees who work in a state or locality with more generous paid sick leave benefits than specified here will receive the benefit of those sick leave laws.

Since 1999, UST has worked side by side with the world’s best companies to make a powerful impact through transformation. Headquartered in the United States, UST is powered by technology, driven by AI, inspired by people, and led by our purpose, we partner with our clients from design to operation. Our AI-driven digital solutions, proprietary platforms, engineering, R&D, products, and innovation ecosystem turn core challenges into impactful, disruptive business outcomes. With deep industry knowledge and a future-ready mindset, we infuse expertise, innovation, and agility into our clients’ organizations-delivering measurable value and positive lasting change for them, their customers, and communities around the world. Together, with 30,000+ employees in 30+ countries, we build for boundless impact-touching billions of lives in the process. Visit us at .