Senior Full-Stack .NET Developer

We are looking for a Senior Full-Stack .NET Developer to remediate security vulnerabilities, support legacy applications, and modernize services across .NET Framework and .NET 6/8+. You will work across backend, data, and frontend while partnering on secure delivery.

Responsibilities

• Investigate and remediate application security vulnerabilities across OWASP Top 10 and automated SAST/DAST findings
• Harden applications against SQL injection, XSS, and dependency-related risks
• Maintain and modernize legacy .NET Framework applications including ASP.NET Web Forms, ASP.NET MVC, WCF, and ASMX
• Build and enhance ASP.NET Core Web APIs and modern .NET services using clean architecture practices
• Implement secure data access with Microsoft SQL Server and ADO.NET
• Develop and refine frontend features using JavaScript and existing UI patterns
• Collaborate with DevOps to support secure CI/CD pipelines and production deployments
• Troubleshoot production issues and deliver timely fixes with minimal risk
• Review code changes for security, maintainability, and backward compatibility
• Document remediation decisions and modernization steps for future maintenance

Requirements

• 3+ years of full-stack .NET development experience
• Strong leadership and ownership skills to drive remediation and modernization work
• Daily availability aligned to 5:00 PM CT (Central Time)
• C# and .NET Framework expertise including ASP.NET MVC and Web Forms
• Strong application security knowledge covering OWASP Top 10 vulnerabilities
• REST API development skills with ASP.NET Core and modern .NET (6/8+)
• Microsoft SQL Server and ADO.NET skills for secure data access
• WCF experience supporting and maintaining legacy services
• JavaScript skills for frontend enhancements and integrations
• Strong troubleshooting skills to diagnose issues in large legacy codebases
• Clear communication skills to collaborate across engineering and DevOps
• Upper-Intermediate English skills (B2+)

Nice to have

• OAuth2 knowledge for secure authorization flows
• OpenID Connect knowledge for modern identity integration
• Octopus Deploy experience supporting deployments
• Strong HTML skills for maintaining legacy views
• Strong CSS skills for UI fixes and incremental improvements

Benefits

• International projects with top brands
• Work with global teams of highly skilled, diverse peers
• Healthcare benefits
• Employee financial programs
• Paid time off and sick leave
• Upskilling, reskilling and certification courses
• Unlimited access to the LinkedIn Learning library and 22,000+ courses
• Global career opportunities
• Volunteer and community involvement opportunities
• EPAM Employee Groups
• Award-winning culture recognized by Glassdoor, Newsweek and LinkedIn