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Senior Full-Stack .NET Developer

Remote in Mexico, & 2 others
.NET& 12 others
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We are seeking a Senior Full-Stack .NET Developer to strengthen security, support legacy applications, and drive modernization across .NET Framework and .NET 6/8+ services. You will remediate vulnerabilities, enhance APIs and data access, and collaborate on reliable releases.

Responsibilities
  • Investigate and remediate application security vulnerabilities, including OWASP Top 10 findings
  • Maintain and modernize legacy .NET Framework applications using ASP.NET MVC and WCF
  • Develop and enhance modern .NET services and RESTful APIs on .NET 6/8+
  • Implement secure data access with SQL Server and ADO.NET
  • Harden applications against SQL injection, XSS, and dependency risks
  • Collaborate with DevOps to support secure CI/CD pipelines and production releases
  • Coordinate work to ensure daily availability until 5:00 PM CT
Requirements
  • 3+ years full-stack .NET development experience
  • Proven project delivery experience modernizing and supporting large legacy codebases
  • Advanced C# and .NET Framework skills with ASP.NET MVC and WCF
  • Strong SQL Server and ADO.NET skills with secure data access practices
  • Practical application security knowledge with OWASP Top 10 remediation experience
  • Upper-Intermediate English proficiency (B2) for daily collaboration
Nice to have
  • OAuth2 implementation experience
  • OpenID Connect (OIDC) knowledge
  • Octopus Deploy experience
  • Strong HTML skills
  • Strong CSS skills