Senior Full-Stack.NET Developer

About the Position

We are seeking a Senior Full-Stack.NET Developer to strengthen and modernize enterprise applications by remediating security vulnerabilities and supporting legacy systems while building modern.NET services. You will work across backend, data, and frontend layers and partner with DevOps to deliver secure releases.

Responsibilities

• Investigate and remediate security vulnerabilities, including OWASP Top 10 findings
• Harden applications against SQL injection, XSS, and dependency risks
• Maintain and modernize legacy .NET applications using ASP.NET MVC and WCF
• Build and enhance ASP.NET Core Web APIs and modern.NET services
• Implement secure data access with Microsoft SQL Server and ADO.NET
• Develop and refine frontend features using JavaScript and related web technologies
• Collaborate with DevOps to support secure CI/CD and production deployments
• Coordinate work to ensure daily availability until 5:00 PM CT

Requirements

• 3+ years full-stack.NET development experience
• Strong.NET security remediation experience with OWASP Top 10
• Advanced troubleshooting skills for large legacy codebases
• Proven project ownership across maintenance and modernization efforts
• Solid C# skills with.NET Framework and modern.NET (6/8+)
• Hands-on ASP.NET MVC, WCF, and ADO.NET experience
• Strong SQL Server skills with secure data access practices
• Practical JavaScript skills for frontend integration
• Upper-Intermediate English proficiency (B2)

Nice to Have

• OAuth2 knowledge
• OpenID Connect knowledge
• Octopus Deploy experience
• HTML skills
• CSS skills

We Offer

• 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