Senior Application Security Engineer

About this role

About the Position The Senior Application Security Engineer is a hands-on role within Production Engineering, responsible for improving the security of Accelerant's applications, APIs, cloud services, and software delivery practices. The role combines application security engineering, vulnerability management, penetration testing, security automation, application perimeter protection, and close partnership with development squads.

A key responsibility will be turning security findings into completed remediation. The successful candidate will work directly with development squads to prioritize and close Critical and High vulnerabilities, using proactive processes and security AI agents to improve triage, exploitability analysis, remediation guidance, and verification. Role Expectations • Own and improve application security practices across web applications, APIs, services, and CI/CD pipelines.

• Manage the external penetration testing program, including planning, scoping, scheduling, vendor engagement, communications, findings review, remediation tracking, and retesting. • Broker the relationship between development teams and third-party penetration testing providers to ensure clear expectations, effective testing, and timely closure of findings. • Work directly with development squads to prioritize and close Critical and High CVEs and other significant application security findings.

• Build proactive vulnerability remediation processes using approved security AI agents and automation. • Operate and improve SAST, DAST, SCA, container, secrets, and vulnerability-scanning capabilities within development workflows. • Maintain and continuously improve WAF policies, application perimeter protections, API security policies, filtering, and rate-limiting controls. • Support threat modeling, secure design reviews, vulnerability assessments, incident response, and secure coding practices.

• Work with Compliance to gather and maintain evidence supporting ISO 27001, SOX, and SOC 1/2 requirements. • Partner with Development, Architecture, Cloud/DevOps, Compliance, and other Security disciplines to embed security into delivery practices. • Provide clear security guidance, documentation, reporting, and education to technical teams. Technical Skills and Related Experience Required • 5+ years of experience in application security, product security, DevSecOps, or a related discipline.