Senior Software Engineer
Analyze and remediate security vulnerabilities identified through penetration testing across legacy and modern .NET applications. Design and maintain applications while supporting identity and authentication solutions and optimizing SQL databases.
- Hybrid
- Toronto, ON
- Posted Aug 13, 2026
- Apply by Sep 12, 2026
- 1 position
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Job summary
Senior Software Engineer (Contract Position) Number of openings: 1, 6months initial contract Location: Toronto, Mississauga, GTA Hybrid role, 3-4d/w onsite mandatory Must be eligible to work in Canada Roles and responsibilities: We are seeking an experienced Software engineer to analyze, remediate, test, and validate security vulnerabilities identified through penetration testing and security assessments across legacy and modern .NET applications. Key Responsibilities Analyze and fix security vulnerabilities identified through penetration testing and vulnerability scans. Design, remediate, and maintain applications using .NET Framework, .NET Core, C#, ASP.NET Web Forms, Web API, and WCF Services. Build and update responsive UI components using JavaScript, jQuery, Angular, React, HTML5, CSS3, and Node.js. Support identity, authentication, and authorization solutions using Entra ID, Auth0, and AD-LDS. Develop and optimize MS SQL Server database objects and T-SQL queries. Manage CI/CD pipelines and source code using GitLab and TFS/Azure DevOps. Deploy and configure applications on IIS and Windows Server environments. Must have skills/experience/ qualifications & Requirements Experience: 5+ years in Microsoft application development with hands-on experience in penetration test remediation. Backend: Strong proficiency in C#, .NET Framework, .NET Core, ASP.NET Web API, and WCF Services. Frontend: Working knowledge of JavaScript, jQuery, HTML5/CSS3, Angular, or React. Database & DevOps: MS SQL Server/T-SQL, GitLab, Azure DevOps/TFS, IIS, and Windows Server. Security Standards: Familiarity with OWASP Top 10 vulnerabilities and secure coding principles. Strong problem-solving skills with the ability to work effectively in a hybrid team environment.
What you’ll do
Analyze and remediate security vulnerabilities identified through penetration testing across legacy and modern .NET applications. Design and maintain applications while supporting identity and authentication solutions and optimizing SQL databases.
Requirements
Requires over 5 years of experience in Microsoft application development with a strong focus on penetration test remediation. Proficiency in .NET technologies, frontend frameworks, and secure coding principles like OWASP Top 10 is essential.
Listed skills
- HTMLPreferred
- Node.jsPreferred
- CSSPreferred
- AngularPreferred
- ReactPreferred
- JavaScriptPreferred
- C++Preferred
Other relevant skills
Identified from the job description. Confirm important requirements above.
- C#
- .NET Framework
- .NET Core
- ASP.NET Web API
- WCF Services
- JavaScript
- jQuery
- Angular
- React
- HTML5
- CSS3
- Node.js
- MS SQL Server
- GitLab
- Azure DevOps
- OWASP Top 10
Job areas
- Software
- Technology
- Engineering
- Consulting
- Security & Safety
Additional details
- Minimum experience
- 5+ years
- Apply by
- Sep 12, 2026
- Posting language
- English
- Working hours
- 40 hours per week
- Office presence
- 4 days per week
- Seniority
- Mid-Senior level
- Application method
- Direct apply is available