Senior Full-Stack.NET Developer

About the Position

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

Locations

• Mexico
• Brazil
• Colombia

Employment Type

• Full-time