[Remote] Senior Application Security Engineer (Remote)

Note: The job is a remote job and is open to candidates in USA. Brex is an intelligent finance platform that enables companies to spend smarter and move faster. As a Senior Application Security Engineer, you will focus on identifying and responding to security vulnerabilities across the Brex platform, performing code and design reviews, and developing tools for secure developer workflows.ResponsibilitiesIdentifying vulnerabilities, demonstrating business impact, and articulating the risk of specific vulnerabilities to drive prioritization effortsPerform penetration testing and design reviews, looking for vulnerabilities and insecure designs, work with engineering and product to design secure product featuresMaintain and build internal tools to automate security efforts, perform SAST and DAST testing of the Brex platform, and support secure development practicesBuild and contribute to a culture of collaborative security excellence through technical leadership, learning sessions, and mentorship within the team and wider organizationSkills5+ years work experience in an Application Security or related roleAbility to find vulnerabilities in complex systems, demonstrating business impact through custom attack chainsExperience with a wide range of secure development activities including— threat modeling, developer education, and incident responseKnowledge of Python, scripting languages, and AI/agentic workflows to automate tasks, build tools and improve productivityCollaborative mindset paired with strong written and verbal communication skillsProficiency with Kotlin, gRPC, GraphQL, KubernetesPrevious experience as a software engineerConsultancy experience performing web application security reviewsExperience with securing distributed systems in AWS and cloud environmentsExperience with pentesting and securing agentic features and systemsContributions to the wider technical community— open source, public research, mentorship, community organizing, blogging, CVEs, presentations, etcExperience submitting to bug bounty programs or responsible disclosure programsBenefitsDepending on the position offered, equity and other forms of compensation may be provided as part of a total compensation package.Company OverviewBrex 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 SponsorshipBrex has a track record of offering H1B sponsorships, with 7 in 2026, 31 in 2025, 49 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.