Job Details

Engineering at BrexEngineering at Brex is about building systems that scale with speed and intention. Our teams span Software, Data, Security, and IT, and operate with high autonomy and deep collaboration. We tackle hard technical problems, own our outcomes, and push for excellence at every level — from architecture to deployment. It's an environment where engineering is a craft, and builders become leaders.What you'll doAs a Senior Application Security Engineer, you will focus on finding and responding to security vulnerabilities across the Brex platform. In this role, you will perform code reviews, design reviews, penetration testing, and vulnerability management. You will develop and maintain tooling to perform static and dynamic testing of the Brex platform and tooling which supports secure developer workflows. Application Security is part of our wider Financial Scale organization, which means you will work closely with Security Operations, GRC, Product Security, Front End Platform, IT Infrastructure teams.We're looking for individuals with a strong background and interest in penetration testing. You should have a demonstrated ability to find vulnerabilities in complex systems and craft exploits to demonstrate business impact. This role is highly cross functional and collaborative, you will have the opportunity to work with every engineering team across Brex. You should be enthusiastic about working with a variety of backgrounds, roles, and needs. Building a world-class financial service requires world-class security.Brex is pioneering the next wave of AI-driven financial services for dynamic, high-impact companies like Coinbase, Robinhood, and Anthropic. We're at the early stages of integrating AI across our product suite, this role will have the opportunity to influence and secure the future of AI Security at Brex. You'll be at the forefront of securing our novel AI implementations, identifying attack vectors in agentic-powered features, and partnering with product and engineering teams to build AI capabilities that our customers can trust with their critical financial operations.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 organizationRequirements5+ 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 skillsBonus pointsProficiency 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 programsCompensationThe expected salary range for this role is $192,000 - $240,000. However, the starting base pay will depend on a number of factors including the candidate's location, skills, experience, market demands, and internal pay parity. Depending on the position offered, equity and other forms of compensation may be provided as part of a total compensation package.