Founding Security Engineer

My client in San Francisco, US is looking for: Founding Security Enginee r Full-time On-site San Francisco, CA Base between $230K - $30 0K ***US Citizens Greencard Holders and also Open to H1b Transfers/TN Visa *** Why candidates should j oin: Founding security role at a rocketship company: You'd be Listen's first dedicated security engineer — building the entire security program from scratch at a Sequoia-backed Series B company that's grown 20x YoY in revenue. This is greenfield ownership with real impact.World-class customers and investors: Customers include Anthropic, Google, Microsoft, Cursor, Perplexity, and Robinhood. Backed by Sequoia, Ribbit Capital, and Conviction with $100M raised.Direct report to the CTO: Flat org structure means you report directly to the co-founder/CTO with high visibility and autonomy. No layers of management between you and decision-makers.Strong comp: $230K–$300K base plus meaningful equity at a company with clear trajectory toward a major outcome.Massive and meaningful threat surface: Listen holds voice, face, and device data on millions of people and works with 15% of the Fortune 500. This isn't checkbox security — you'll solve genuinely hard problems protecting sensitive data at scale.Elite engineering team: You'd work alongside IOI medalists, competitive programmers, and engineers from Jane Street and Tesla Autopilot. The bar is high and the people are exceptional.Growth potential: Start as a senior IC owning security end-to-end with the opportunity to build out a team and deepen scope as the company scales ra pidly Re quired7 - 15 years of experience in security engineering or software engineering transitioning to securityHands- on experience spanning application security and infrastructure securityBuilt a security program from scratchThreat modeling and vulnerability assessment (pen tests, vulnerability scans, risk prioritization)Can read and review code for security vulnerabilities (not purely GRC/compliance)Cloud security architecture and multi- tenant isolation expe rience About th is roleWe need someone with 7+ years of experience in security engineering who transitioned from a software engineering/CS background into security. You should be comfortable building a security program from scratch, spotting vulnerabilities in code and infrastructure, and working alongside engineers as they plan and build. Bonus points if you're open to being client-facing with enterprise cus tomers.What you 'll do:Define and build Listen's security architecture from the ground up across the LLM pipeline, infrastructure, and productTake ownership of the entire security program as the first dedicated security hire, reporting directly to the CTOWork closely with engineering pods to identify vulnerabilities, run threat modeling, and ensure secure design patterns as features are planned and shippedHarden multi-tenant isolation and collaborate with the infra team on multi-region data residencyManage pen tests, vulnerability scans, and write lightweight policies that keep the platform compliant and actually secureOwn internal IT (devices, access, identity) and serve as the technical ground truth behind audits, questionnaires, and enterprise security reviewsContribute to and help evolve the security roadmap as Listen scales with Fortune 500 customers including Google, Microsoft, and An thropic