We are looking for a Senior Full-Stack .NET Developer to remediate security vulnerabilities, support legacy applications, and modernize services across .NET Framework and .NET 6/8+. You will work across backend, data, and frontend while partnering on secure delivery.ResponsibilitiesInvestigate and remediate application security vulnerabilities across OWASP Top 10 and automated SAST/DAST findingsHarden applications against SQL injection, XSS, and dependency-related risksMaintain and modernize legacy .NET Framework applications including ASP.NET Web Forms, ASP.NET MVC, WCF, and ASMXBuild and enhance ASP.NET Core Web APIs and modern .NET services using clean architecture practicesImplement secure data access with Microsoft SQL Server and ADO.NETDevelop and refine frontend features using JavaScript and existing UI patternsCollaborate with DevOps to support secure CI/CD pipelines and production deploymentsTroubleshoot production issues and deliver timely fixes with minimal riskReview code changes for security, maintainability, and backward compatibilityDocument remediation decisions and modernization steps for future maintenanceRequirements3+ years of full-stack .NET development experienceStrong leadership and ownership skills to drive remediation and modernization workDaily availability aligned to 5:00 PM CT (Central Time)C# and .NET Framework expertise including ASP.NET MVC and Web FormsStrong application security knowledge covering OWASP Top 10 vulnerabilitiesREST API development skills with ASP.NET Core and modern .NET (6/8+)Microsoft SQL Server and ADO.NET skills for secure data accessWCF experience supporting and maintaining legacy servicesJavaScript skills for frontend enhancements and integrationsStrong troubleshooting skills to diagnose issues in large legacy codebasesClear communication skills to collaborate across engineering and DevOpsUpper-Intermediate English skills (B2+)Nice to haveOAuth2 knowledge for secure authorization flowsOpenID Connect knowledge for modern identity integrationOctopus Deploy experience supporting deploymentsStrong HTML skills for maintaining legacy viewsStrong CSS skills for UI fixes and incremental improvementsWe offerInternational projects with top brandsWork with integral teams of highly skilled, diverse peersHealthcare benefitsEmployee financial programsPaid time off and sick leaveUpskilling, reskilling and certification coursesUnlimited access to the LinkedIn Learning library and 22,000+ coursesGlobal career opportunitiesVolunteer and community involvement opportunitiesEPAM Employee GroupsAward-winning culture recognized by Glassdoor, Newsweek and LinkedInEPAM 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.
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📌 Senior Full-Stack .NET Developer (Colombia)
🏢 EPAM Systems
📍 Colombia