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Senior Full-Stack .NET Developer

Remote in Brazil, & 2 others
.NET& 12 others
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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.

Responsibilities
  • Investigate and remediate application security vulnerabilities across OWASP Top 10 and automated SAST/DAST findings
  • Harden applications against SQL injection, XSS, and dependency-related risks
  • Maintain and modernize legacy .NET Framework applications including ASP.NET Web Forms, ASP.NET MVC, WCF, and ASMX
  • Build and enhance ASP.NET Core Web APIs and modern .NET services using clean architecture practices
  • Implement secure data access with Microsoft SQL Server and ADO.NET
  • Develop and refine frontend features using JavaScript and existing UI patterns
  • Collaborate with DevOps to support secure CI/CD pipelines and production deployments
  • Troubleshoot production issues and deliver timely fixes with minimal risk
  • Review code changes for security, maintainability, and backward compatibility
  • Document remediation decisions and modernization steps for future maintenance
Requirements
  • 3+ years of full-stack .NET development experience
  • Strong leadership and ownership skills to drive remediation and modernization work
  • Daily availability aligned to 5:00 PM CT (Central Time)
  • C# and .NET Framework expertise including ASP.NET MVC and Web Forms
  • Strong application security knowledge covering OWASP Top 10 vulnerabilities
  • REST API development skills with ASP.NET Core and modern .NET (6/8+)
  • Microsoft SQL Server and ADO.NET skills for secure data access
  • WCF experience supporting and maintaining legacy services
  • JavaScript skills for frontend enhancements and integrations
  • Strong troubleshooting skills to diagnose issues in large legacy codebases
  • Clear communication skills to collaborate across engineering and DevOps
  • Upper-Intermediate English skills (B2+)
Nice to have
  • OAuth2 knowledge for secure authorization flows
  • OpenID Connect knowledge for modern identity integration
  • Octopus Deploy experience supporting deployments
  • Strong HTML skills for maintaining legacy views
  • Strong CSS skills for UI fixes and incremental improvements