We are looking for a Full-Stack .NET Developer to remediate security vulnerabilities, support legacy applications, and help modernize services across .NET technologies. You will work across the backend, database, and UI while collaborating on secure delivery practices.

Responsibilities

- Investigate and remediate security vulnerabilities, including OWASP Top 10 issues and common injection risks
- Support and modernize legacy .NET applications built with ASP.NET MVC and related technologies
- Develop and enhance .NET services and APIs to improve stability and security
- Implement secure data access patterns using ADO.NET with Microsoft SQL Server
- Fix and improve front-end behavior using JavaScript in server-rendered web applications
- Coordinate with DevOps partners to support secure CI/CD and production deployments
- Maintain daily availability until 5:00 PM CT to support collaboration and delivery needs

Requirements

- 2+ years of .NET development experience with legacy and modern .NET
- Hands-on application security experience with OWASP Top 10 and vulnerability remediation
- Strong ASP.NET MVC skills for maintaining and enhancing web applications
- Solid ADO.NET skills for secure and efficient data access
- Strong Microsoft SQL Server skills including secure query design
- Practical JavaScript skills for front-end feature development and fixes
- Working WCF knowledge for supporting and updating service integrations




- Strong troubleshooting skills for analyzing issues in large legacy codebases
- Clear communication skills for collaborating with engineering and DevOps peers
- English proficiency Upper-Intermediate (B2) for daily written and spoken communication

Nice to have

- OAuth2 knowledge for secure authorization flows
- OpenID Connect knowledge for authentication integration
- Octopus Deploy experience for deployment automation
- HTML skills for maintaining and improving UI pages
- CSS skills for styling fixes and incremental UI improvements

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 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

EPAM 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.

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