We are looking for a Full-Stack .NET Developer with experience in both legacy .NET Framework and modern .NET (.NET 6/8+).

You will contribute to security vulnerability remediation, legacy application support, and modernization efforts under the guidance of senior team members.

Responsibilities

Assist in investigating and remediating application security vulnerabilities, including OWASP Top 10, SAST/DAST findings, SQL injection, XSS, and dependency risks

Support and help modernize legacy ASP.NET Web Forms, MVC, WCF, and ASMX applications

Participate in the development and enhancement of ASP.NET Core Web APIs and modern .NET services

Work with SQL Server, ADO.NET, EF Core/Dapper, following secure data access practices

Contribute to frontend development using HTML, CSS, Java

Script/Type

Script, jQuery, and modern SPA frameworks

Collaborate with Dev

Ops engineers on CI/CD processes and production deployments

Requirements2+ years of full-stack .NET development experience

Solid knowledge of C#, .NET Framework, and SQL Server

Working experience with ASP.NET Web Forms and MVCFamiliarity with .NET 6/8+, ASP.NET Core, and REST APIsUnderstanding of dependency injection





Basic application security awareness and familiarity with OWASP Top 10Experience with at least one of the following: React, Angular, or Vue.js

Good troubleshooting skills and willingness to work with legacy codebases

English proficiency at an Intermediate level or higher (B1+)Nice to have

Exposure to Team

City, Octopus Deploy, or IISBasic understanding of OAuth2, OIDC, and JWTSkills in HTML, CSS, and jQuery

We offer

International projects with top brands

Work with general 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

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