Full-Stack .NET Developer

EPAM Systems Inc; United States; Remote; USD 80,000 - 120,000; Full time

Job summary

EPAM Systems Inc. is seeking a Full-Stack .NET Developer to strengthen application security, support legacy systems, and help modernize services across .NET Framework and modern .NET. You will work across backend, database, and frontend tasks.

The role focuses on securing applications, updating legacy ASP.NET MVC and WCF services, and delivering robust Web APIs. Strong English communication and collaboration with DevOps are essential.

Qualifications

• 2+ years of full-stack .NET development in production apps.
• Experience remediating OWASP Top 10 security findings.
• Legacy app experience with ASP.NET MVC and WCF.
• Experience with .NET Web APIs and service-oriented design.
• Strong SQL Server data access skills.
• Frontend development with JavaScript.
• Strong troubleshooting with root-cause analysis.
• Excellent written and spoken English (B2).

Responsibilities

• Investigate and remediate application security vulnerabilities including OWASP Top 10 findings.
• Analyze SAST/DAST results and implement secure code fixes for SQL injection and XSS risks.
• Support and modernize legacy .NET applications using ASP.NET MVC and WCF services.
• Build and enhance .NET Web APIs and backend services with secure patterns.
• Implement secure database interactions using ADO.NET with Microsoft SQL Server.
• Update frontend features and fixes using JavaScript alongside existing UI code.
• Coordinate with DevOps to enable secure CI/CD and reliable production deployments.
• Document remediation work, modernization changes, and security best practices.

Skills

JavaScript

HTML/CSS

jQuery

Root-cause analysis

Clear communication

Tools

OpenID Connect

OAuth2

Octopus Deploy

ASP.NET MVC

WCF

Web API

SQL Server

Job description

We are seeking a Full-Stack .NET Developer to strengthen application security, support legacy systems, and help modernize services across .NET Framework and modern .NET. You will work across backend, database, and frontend tasks.

Responsibilities

• Investigate and remediate application security vulnerabilities including OWASP Top 10 findings
• Analyze SAST/DAST results and implement secure code fixes for SQL injection and XSS risks
• Support and modernize legacy .NET applications using ASP.NET MVC and WCF services
• Build and enhance .NET Web APIs and backend services with secure patterns
• Implement secure database interactions using ADO.NET with Microsoft SQL Server
• Update frontend features and fixes using JavaScript alongside existing UI code
• Coordinate with DevOps to enable secure CI/CD and reliable production deployments
• Document remediation work, modernization changes, and security best practices

Requirements

• Full-stack .NET experience (2+ years) with production applications
• Security remediation experience addressing OWASP Top 10 risks
• Legacy application experience with ASP.NET MVC, WCF, and large codebases
• Modern .NET experience with Web APIs and service-oriented design
• Strong database skills with Microsoft SQL Server and secure data access
• Solid programming skills in JavaScript for frontend integration
• Strong troubleshooting skills with root-cause analysis and debugging
• Clear communication skills for coordinating fixes and priorities
• Upper-Intermediate English proficiency (B2, Upper-Intermediate)
• Nice to have OAuth2 implementation experience
• OpenID Connect (OIDC) and token-based auth knowledge
• Octopus Deploy experience
• Strong HTML and CSS skills
• jQuery maintenance experience