Senior Full-Stack .NET Developer

We are seeking a Senior Full-Stack .NET Developer to strengthen security, support legacy applications, and drive modernization across .NET Framework and .NET 6/8+ services. You will remediate vulnerabilities, enhance APIs and data access, and collaborate on reliable releases. Responsibilities Investigate and remediate application security vulnerabilities, including OWASP Top 10 findings Maintain and modernize legacy .NET Framework applications using ASP.NET MVC and WCF Develop and enhance modern .NET services and RESTful APIs on .NET 6/8+ Implement secure data access with SQL Server and ADO.NET Harden applications against SQL injection, XSS, and dependency risks Collaborate with DevOps to support secure CI/CD pipelines and production releases Coordinate work to ensure daily availability until 5:00 PM CT Requirements 3+ years full-stack .NET development experience Proven project delivery experience modernizing and supporting large legacy codebases Advanced C# and .NET Framework skills with ASP.NET MVC and WCF Strong SQL Server and ADO.NET skills with secure data access practices Practical application security knowledge with OWASP Top 10 remediation experience Upper-Intermediate English proficiency (B2) for daily collaboration Nice to have OAuth2 implementation experience OpenID Connect (OIDC) knowledge Octopus Deploy experience Strong HTML skills Strong 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 EPAM is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, sexual orientation, gender identity or expression, disability, protected veteran status, or any other characteristic protected by applicable law.