Senior Full Stack .NET Developer – Security Remediation - 0505 Sr. Full Stack .NET Developer – Security Remediation - 0505 Duration: 6 Months Location: Toronto, Hybrid (3x/week) Overview: Responsible for analyzing, remediating, testing and validating security vulnerabilities identified through penetration testing and security assessments across legacy and contemporary .NET applications.

Key Responsibilities

- Analyze and remediate vulnerabilities identified through penetration testing, vulnerability scans, and security assessments.
- Design, develop, and maintain applications using .NET Framework, .NET Core/.NET, ASP.NET Web Forms, ASP.NET Web API, and WCF Services.
- Build and maintain responsive user interfaces using ASP.NET Web Forms, Angular, React, JavaScript, jQuery, HTML5, CSS3, and Node.js.
- Support authentication and authorization solutions using Entra ID, Auth0, and AD-LDS.




- Develop and optimize Microsoft SQL Server database objects and queries.
- Manage source code and CI/CD pipelines using GitLab and TFS/Azure DevOps.
- Configure and deploy applications on IIS and Windows Server environments.
- Perform unit testing, code reviews, and regression testing.

Must Haves

- Microsoft SQL Server and T-SQL - OWASP Top 10 and secure coding practices - Experience supporting penetration test remediation initiatives - .NET Framework, .NET Core/.NET, C# - ASP.NET Web Forms, ASP.NET Web API, WCF Services - Angular, React, JavaScript, jQuery, HTML5, CSS3, Node.js - GitLab, TFS/Azure DevOps, CI/CD - IIS, Windows Server, Entra ID, Auth0, AD-LDS Disclaimer: AI may be used in evaluating candidates. This posting is for an existing vacancy.

📌 Senior Full Stack .NET Developer – Security Remediation - 0505 (Toronto)
🏢 S.i. Systems
📍 Toronto