[Remote] Senior Application Security Engineer (Remote)

Note: The job is a remote job and is open to candidates in USA. Brex is the intelligent finance platform that enables companies to spend smarter and move faster in more than 200 markets. As a Senior Application Security Engineer, you will focus on finding and responding to security vulnerabilities across the Brex platform, performing code reviews, design reviews, and penetration testing while collaborating with various engineering teams.

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

Skills

• 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
• 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

Benefits

• Equity and other forms of compensation may be provided as part of a total compensation package

Company Overview

Brex is a financial service and technology company that provides business credit cards and cash management accounts. It is a sub-organization of Capital One. It was founded in 2017, and is headquartered in San Francisco, California, USA, with a workforce of 1001-5000 employees. Its website is https://brex.com.

Company H1B Sponsorship

Brex has a track record of offering H1B sponsorships, with 13 in 2026, 31 in 2025, 48 in 2024, 53 in 2023, 65 in 2022, 70 in 2021, 37 in 2020. Please note that this does not guarantee sponsorship for this specific role.