BrexSenior Application Security Engineer
Senior Application Security Engineer needed to find and respond to security vulnerabilities, perform penetration testing, and build security tools. Requires 5+ years of experience.
Why join us
Brex is the AI-powered spend platform.
Engineering at Brex
Engineering at Brex is about building systems that scale with speed and intention.
What you’ll do
As a Senior Application Security Engineer, you will focus on finding and responding to security vulnerabilities across the Brex platform.
Where you’ll work
This role will be based in our Seattle office.
Responsibilities
- 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
Bonus points
- Proficiency with Kotlin, gRPC, GraphQL, Kubernetes
- Previous experience as a software engineer
- Consultancy experience performing web application security reviews
- Experience with securing distributed systems in AWS and cloud environments
- Experience with pentesting and securing agentic features and systems
- Contributions to the wider technical community— open source, public research, mentorship, community organizing, blogging, CVEs, presentations, etc
- Experience submitting to bug bounty programs or responsible disclosure programs
Compensation
The expected salary range for this role is $192,000 - $240,000.