Senior Application Security Engineer

Brex is seeking a Senior Application Security Engineer to focus on finding and responding to security vulnerabilities across the Brex platform. The role involves performing code reviews, design reviews, penetration testing, and vulnerability management, as well as developing and maintaining tooling to support secure developer workflows. The successful candidate will have a strong background in penetration testing and a demonstrated ability to find vulnerabilities in complex systems.

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

Benefits

• Generous Paid Time Off
• 401k Matching
• Retirement Plan
• Tuition Reimbursement
• Relocation Assistance
• Visa Sponsorship