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 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, Java

Script/Type

Script, jQuery, and modern SPA frameworks

Collaborate with Dev

Ops to support secure CI/CD and production deployments

Requirements3+ years of full-stack .NET development experience

Expertise in C#, .NET Framework, and SQL Server

Proficiency in ASP.NET Web Forms and MVCBackground in .NET 6/8+, ASP.NET Core, and REST APIsUnderstanding of dependency injection

Practical application security experience and knowledge of OWASP Top 10Experience 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 Team

City, Octopus Deploy, and IISKnowledge of OAuth2, OIDC, and JWTSkills in HTML, CSS, and jQuery

We offer

International projects with top brands

Work with integral 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 Linked

In Learning library and 22,000+ courses

Global career opportunities

Volunteer and community involvement opportunitiesEPAM Employee Groups

Award-winning culture recognized by Glassdoor, Newsweek and Linked

InEPAM 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. #J-18808-Ljbffr

📌 Senior Full-Stack .NET Developer (Security & Modernization) (Colombia)
🏢 EPAM Systems
📍 Colombia