Senior .NET Developer – Application Security Senior .NET Developer , you will make an impact by strengthening the security posture of enterprise applications through vulnerability analysis, remediation, and secure software development practices. You will be a valued member of the application development and security team, collaborating with architects, DevOps engineers, developers, and cybersecurity stakeholders to deliver secure, resilient, and compliant solutions. 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. 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. Contribute to CI/CD pipeline improvements by integrating automated security scanning and remediation processes.

Provide technical guidance and mentorship on secure development practices and vulnerability prevention.



Based on this role’s business requirements, this is a hybrid position requiring 3 days a week in a client or Cognizant office. Bachelor's degree in Computer Science, Information Technology, Software Engineering, or a related field.

NET and C#. Proven experience identifying, analyzing, and remediating application security vulnerabilities. Deep understanding of OWASP Top 10 vulnerabilities, secure coding principles, and application security best practices.

Experience working with SAST, DAST, SCA, and penetration testing reports. Hands-on experience with security scanning tools such as Checkmarx, Fortify, AppScan, SonarQube, or equivalent.

Experience performing root cause analysis and implementing long-term security fixes. Familiarity with CI/CD pipelines and integrating automated security controls within software delivery processes. Ability to work independently and begin reviewing and remediating security findings with minimal onboarding support. These will help you stand out Security-related certifications such as CSSLP, GWAPT, GSEC, Security+, or similar.

Experience securing applications hosted in cloud environments such as Azure or AWS.

Experience with threat modeling, secure architecture reviews, and security risk assessments. Solid communication skills with the ability to influence technical and non-technical stakeholders. This role is also eligible for Cognizant’s discretionary annual incentive program, subject to performance and applicable plan terms.

📌 Senior .NET Developer - Application Security (Halifax Regional Municipality)
🏢 Cognizant
📍 Halifax Regional Municipality