Senior Application Security Engineer

Job Description: - Identifying vulnerabilities, demonstrating business impact, and articulating the risk of specific vulnerabilities to drive prioritization efforts

- Perform penetration testing and design reviews, looking for vulnerabilities and insecure designs, work with engineering and product to design secure product features

- Maintain and build internal tools to automate security efforts, perform SAST and DAST testing of the Brex platform, and support secure development practices

- Build and contribute to a culture of collaborative security excellence through technical leadership, learning sessions, and mentorship within the team and wider organization

Requirements: - 5+ years work experience in an Application Security or related role

- Ability to find vulnerabilities in complex systems, demonstrating business impact through custom attack chains

- Experience with a wide range of secure development activities including— threat modeling, developer education, and incident response

- Knowledge of Python, scripting languages, and AI/agentic workflows to automate tasks, build tools and improve productivity

- Collaborative mindset paired with strong written and verbal communication skills