Senior Security Engineer San Francisco; Hybrid

At , we are building the AI Search Infrastructure that powers modern AI systems. Our goal is to create the trusted knowledge layer that agents, applications, and enterprises rely on to retrieve real‑time, accurate, and citation‑backed information.

Our platform combines proprietary vertical indexes with LLM‑optimized retrieval systems to power AI agents, applications, and enterprise workflows. We are solving hard problems across search, large language models, and large‑scale infrastructure to make AI systems more reliable, transparent, and useful.

Our team includes engineers, researchers, product builders, and operators who care about solving meaningful problems and delivering real-world impact. Whether you are improving core infrastructure, shaping product experiences, or helping bring new AI capabilities to market, your work will help define how modern AI finds and uses knowledge.

The Security Engineering team at  is dedicated to enabling engineering teams to securely design, build, test, and maintain the software and infrastructure that powers the company’s platforms. The team establishes a "paved road" approach, ensuring engineers can deliver secure technologies with minimal friction while maintaining a strong focus on protecting the business, earning customer trust, and fostering a culture of security, transparency, and shared responsibility.

Reporting to the Head of Security, this role will champion security across , driving continuous improvement and empowering teams to build trusted, resilient services.

• Act as a security subject matter expert to support engineers through design reviews, threat modeling, code reviews, patch creation, and security testing.
• Collaborate with product and engineering teams to architect resilient, security‑first services.
• Engineer and implement secure, scalable, and resilient systems.
• Develop and customize high‑signal security tooling through automation and plugins.
• Manage day‑to‑day security tasks, including abuse remediation, threat research, and incident handling.
• Participate in on‑call rotations and incident response efforts to ensure platform and customer security.

• Experience: 9+ years in security roles across disciplines such as application security, Dev Ops, security operations, software engineering, red teaming, incident response, security research, and AI security.
• Security Expertise: Hands‑on experience in threat modeling, penetration testing, creating security requirements, conducting source code reviews, leading security design reviews, incident response, and securing cloud environments.
• Collaboration & Ownership: Self‑motivated, collaborative, and skilled at prioritizing work. A strong advocate of ownership, capable of managing problems end‑to‑end individually or within a team.
• Security Program Management: Proven experience managing security programs with a focus on partnership and enablement.

This role is instrumental in empowering ’s security mission while enabling the team to deliver secure, cutting‑edge technologies.

Salary Band: $180,000 - $235,000 USD

• Hubs in San Francisco and New York City offering regular in‑person gatherings and co‑working sessions
• Flexible PTO with U.S. holidays observed and a week shutdown in December to rest and recharge
• A competitive health insurance plan covers 100% of the policyholder and 75% for dependents
• 12 weeks of paid parental leave in the US
• 401k program, 3% match – vested immediately
• $500 work‑from‑home stipend to be used up to a year of your start date
• $600 technology stipend to support a portion of our hybrid/remote team’s cell phone and internet expenses
• $1,200 per year Health & Wellness Allowance to support your personal goals
• The chance to collaborate with a team at the forefront of AI research

* Certain perks and benefits are limited to full‑time employees only

We are also an inclusive, equitable, and accessible workplace. Please let us know if you require accommodation for any portion of the recruitment and hiring process.

Beware of recruiting scams:  will only contact you through official  email addresses and will never ask for payment or sensitive personal information during the hiring process.

We participate in E‑Verify. We will provide the Social Security Administration (SSA) and, if necessary, the Department of Homeland Security (DHS) with information from each new employee’s Form I‑9 to confirm work authorization. (English/Spanish: E‑Verify Participation / Right to Work)