Founding Security Lead (US)

We are looking for a Founding Security Lead with 4-8 years of experience to own and evolve the application security program at a fast-growing AI-native fintech startup. You'll be a "super IC", someone who thrives doing hands-on security work while naturally growing into technical leadership. This role is ideal for someone with a strong application security background who is passionate about securing AI agents and agentic workflows in a highly regulated banking environment. You'll join an existing security foundation and take it to the next level as the company scales from Series A through its next phase of growth.

What you will be doing

• Owning and maturing the application security program, building security tooling, processes, and secure SDLC practices that integrate naturally into how engineers ship code

• Securing the AI agent execution surface, partnering with engineering to establish robust security architecture for agentic workflows, ensuring data privacy and mitigating AI-specific vulnerabilities

• Driving automation of security processes, building detection pipelines, automating vulnerability management, and reducing manual security overhead

• Leading incident response, acting as primary incident commander and turning every event into systemic improvements

• Supporting compliance and customer trust initiatives, contributing to SOC 2, ISO 27001, and bank-driven security requirements as a nice-to-have extension of your core security work