Senior Software Engineer, Security

About Persona Persona https://withpersona.com/ is the configurable identity platform built for businesses in a digital-first world. Verifying individuals and organizations is harder — but more important — than ever, with AI enabling fraudsters to launch sophisticated accounts at scale and regulations evolving rapidly. We’ve built Persona to support practically every use case and industry — that’s why we’re able to serve a wide range of leading companies. For example, Reddit relies on Persona for age assurance and verification to comply with online safety regulations, protecting younger users while maintaining a seamless experience. Meanwhile, OpenAI relies on Persona to keep bad actors out, protecting one of the world’s most powerful AI platforms from large-scale abuse in a time when AI is reshaping the way we work and live. We’re growing rapidly and looking for exceptional people to join us! About the Role Persona builds identity verification infrastructure — security isn't a layer we add later, it's core to everything we ship. When security fails at most companies, systems go down. At an identity verification company, real people's identities are compromised. The stakes here are different. As AI tooling lets teams ship faster than ever and breaches make headlines every week, the gap between what gets built and what gets built securely is widening. The engineers who are working on closing that gap are more critical than ever. This is a software engineering role first. Security curiosity matters; a dedicated security background doesn't. What you'll work on The security team operates as a true generalist function. Right now that means: - Designing and building IAM systems that enterprise customers use to manage PII across global teams - Supply chain security as Persona's AI tooling and integrations expand - Building secure, convenient internal tooling for engineers as we scale AI usage Must-haves - 5+ years of software engineering experience - You've built and shipped systems at scale, not just advised on them - You own implementation end-to-end, from design to delivery - Clear communicator who can work across teams without losing technical depth Nice to have - Proficient in Ruby on Rails - Experience with IAM, authn/authz frameworks, or identity protocols (OAuth, SAML, OIDC) - Familiarity with software supply chain security, secure SDLC, or AI/ML security risks - You've worked somewhere where PII or sensitive data was the core product The team Small, senior, and intentionally so. High ownership from day one. This isn't a team where your work disappears into a large org. Benefits and Perks For full-time US-based employees (excluding internship and contractor opportunities), Persona offers a wide range of benefits, including medical, dental, and vision, 3% 401(k) contribution, unlimited PTO, quarterly mental health days, family planning benefits, professional development stipend, wellness benefits, among others. For full-time UK employees, Persona offers a wide range of benefits, including private medical insurance, dental insurance, a 6% employer pension contribution, unlimited PTO, a monthly wellness stipend, professional development stipend, co-working stipend, and more. As part of our interview process, all candidates will be asked to verify their identity with Persona. This step is used solely to confirm that candidates are who they say they are, and will have no impact on hiring decisions.