Senior .NET Security Engineer (Remote)

Cognizant; Halifax; Remote; CAD 70,000 - 93,000; Full time

Job summary

Cognizant is seeking a Senior .NET Developer in Canada to strengthen the security posture of enterprise apps. You will analyze SAST/DAST/SCA results, fix vulnerabilities, and write secure .NET code.

You will collaborate across engineering, architecture, DevOps and security teams while applying OWASP standards and secure SDLC practices. The role emphasizes practical remediation, code reviews with security in mind, and CI/CD security integration, with opportunities to leverage AI tools to

Qualifications

• 6+ years of strong .NET development background with proven experience in identifying and fixing application vulnerabilities.
• Must have strong hands-on experience in vulnerability remediation and security fixes for internet-facing applications.
• Hands-on experience with DAST, SAST, and SCA tools such as AppScan, Checkmarx, SonarQube, or equivalent.
• Demonstrated experience remediating OWASP Top 10 vulnerabilities, security findings, and secure coding issues in production applications.
• Experience supporting and securing internet-facing web applications, APIs, and cloud-hosted services.
• Ability to independently analyze scan reports, perform root-cause analysis, and implement remediation with minimal ramp-up.
• Familiarity with CI/CD security integration and DevSecOps practices.
• Experience leveraging AI-assisted development and security tools (GitHub Copilot, Claude similar) to accelerate vulnerability analysis, code remediation, secure code reviews, and developer productivity.
• Strong communication skills and ability to work directly with client stakeholders.

Responsibilities

• Analyze and remediate application security vulnerabilities identified through SAST, DAST, SCA, and penetration testing assessments.
• Implement secure coding practices across .NET applications in alignment with OWASP standards and industry best practices.
• Review, investigate, and resolve security findings generated by tools such as Checkmarx, Fortify, AppScan, SonarQube, and similar platforms to evaluate risk and validate security patches.
• Perform root cause analysis of security issues and implement sustainable remediation strategies to prevent recurrence.
• Collaborate with development, architecture, DevOps, and security teams to ensure timely resolution of identified vulnerabilities.
• Support Secure SDLC initiatives and ensure compliance with organizational and client application security requirements.
• Conduct code reviews with a strong focus on security, maintainability, and application performance.
• Integrate automated security gates into CI/CD pipelines and utilize AI-driven tools (GitHub Copilot, Claude) to accelerate code reviews, threat analysis, and remediation workflows.
• Provide technical guidance and mentorship on secure development practices and vulnerability prevention.

Skills

NET development

Vulnerability remediation

DevSecOps

OWASP standards

CI/CD security

AI-assisted development

Client communication

Tools

AppScan

Checkmarx

SonarQube

GitHub Copilot

Claude

Job description

Cognizant is seeking a Senior .NET Developer in Canada to strengthen the security posture of enterprise apps. You will analyze SAST/DAST/SCA results, fix vulnerabilities, and write secure .NET code.

You will collaborate across engineering, architecture, DevOps and security teams while applying OWASP standards and secure SDLC practices. The role emphasizes practical remediation, code reviews with security in mind, and CI/CD security integration, with opportunities to leverage AI tools to