Founding Security Engineer

About the Company

Our client is a fast-growing, Sequoia-backed Series B AI startup ($100M+ raised, 20x YoY revenue growth) building an autonomous market research platform. Their AI system designs and conducts expert-level customer interviews across audio, video, and text, synthesizing responses into actionable insights in hours rather than weeks.

Trusted by top tech leaders and Fortune 500 enterprises including Google, Microsoft, Anthropic, and Nestlé the company manages voice, video, and device data for millions of participants globally. Founded by serial entrepreneurs alongside a world-class engineering team (with backgrounds from Jane Street, Tesla Autopilot, Harvard, and competitive programming medalists), they are scaling rapidly to transform qualitative research at scale.

About the Role

Seeking a Founding Security Engineer with 7+ years of experience who transitioned from a software engineering background into security. As the first dedicated security hire, you will report directly to the Co-Founder & CTO, building the security program from scratch and securing the entire LLM pipeline, multi-tenant cloud infrastructure, and product suite.

Key Responsibilities

• Build Security Architecture: Define and build end-to-end security architecture across the LLM pipeline, cloud infrastructure, and product features.
• Embed with Engineering: Work closely with engineering pods on threat modeling, code reviews, and secure design patterns for new features.
• Harden Infrastructure: Strengthen multi-tenant isolation and partner with infrastructure teams on multi-region data residency.
• Compliance & Audits: Manage penetration testing, vulnerability scans, internal IT access, and serve as the technical lead for enterprise customer security reviews.
• Client Engagement: Serve as the security authority in conversations with enterprise security teams during vendor assessments.

Role Requirements

• Experience:

  7-15 years spanning software engineering and hands-on application/infrastructure security engineering.

• Foundational Track Record: Proven experience building a security program from scratch at a high-growth technology company.
• Education:

  Computer Science degree or equivalent technical degree.

• Hard Skills: Expert-level threat modeling, vulnerability assessment, cloud security architecture (multi-tenant isolation), and strong code-reading/review skills.
• Tech Stack: TypeScript, Threat Modeling, Vulnerability Discovery, Penetration Testing, Cloud/Infrastructure Security, IAM.
• Location:

  Ability to work on-site 5 days a week in San Francisco, CA.