Senior Full-Stack .NET Developer (Security & Modernization)

We are looking for a Senior Full-Stack .NET Developer experienced with both legacy .NET Framework and modern .NET (.NET 6/8+). The primary focus is security vulnerability remediation, legacy application support, and modernization.

Responsibilities

• Investigate and remediate application security vulnerabilities, including OWASP Top 10, SAST/DAST findings, SQL injection, XSS, and dependency risks
• Maintain and modernize legacy ASP.NET Web Forms, MVC, WCF, and ASMX applications
• Develop and enhance ASP.NET Core Web APIs and modern .NET services
• Work with SQL Server, ADO.NET, EF Core/Dapper, ensuring secure data access
• Support frontend development using HTML, CSS, JavaScript/TypeScript, jQuery, and modern SPA frameworks
• Collaborate with DevOps to support secure CI/CD and production deployments

Requirements

• 3+ years of full-stack .NET development experience
• Expertise in C#, .NET Framework, and SQL Server
• Proficiency in ASP.NET Web Forms and MVC
• Background in .NET 6/8+, ASP.NET Core, and REST APIs
• Understanding of dependency injection
• Practical application security experience and knowledge of OWASP Top 10
• Experience with React, Angular, or Vue.js
• Strong troubleshooting skills and ability to work with large legacy codebases
• English proficiency at an Upper-Intermediate level (B2) or higher

Nice to have

• Experience with TeamCity, Octopus Deploy, and IIS
• Knowledge of OAuth2, OIDC, and JWT
• Skills in HTML, CSS, and jQuery

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