Senior AI Security Engineer

Company Overview

Function Health is the AI operating system for health, designed to empower people to live 100 healthy years. We are redefining how individuals understand, measure, and improve their health by moving beyond reactive care and enabling proactive, data-driven insight into human biology. Function has been recognized as one of Fast Company’s Most Innovative Companies of 2024 , and is venture-backed by Andreessen Horowitz (a16z) . Hundreds of thousands of members have joined Function to take control of their health.

Through advanced diagnostics, deep biomarker testing, longitudinal data, and AI-enabled insights, Function equips members with actionable intelligence to take control of both the quality and length of their lives.

Function recently announced a $298M Series B and is entering its next chapter of growth. As we scale, the quality and durability of our People systems, data, and insights will directly shape our ability to attract, retain, and support exceptional talent.

We are growing our team and seeking out world-class talent that deeply believes in our mission to positively impact global health, has a relentless bias toward action, and a growth mindset. Function fosters a collaborative and dynamic environment where every day we build the future.

Role

As a Senior AI Security Engineer within Product Security, you will work as an embedded partner to engineering, translating security architecture into production controls, evaluations, monitoring, and reusable patterns for Function’s AI systems.

Key Responsibilities

• Implement security controls for AI agents, tools, memory, and data access.
• Build agent identity, authorization, scoped credentials, least privilege permissions, and approval requirements.
• Apply secure patterns for context retrieval, member data isolation, and agent memory.
• Create evaluations for prompt injection, sensitive data disclosure, unsafe tool use, memory poisoning, and unauthorized actions.
• Turn discovered vulnerabilities into automated regression tests and release gates.
• Implement runtime safeguards for tool calls, network access, data egress, and resource use.
• Review agent tools, model integrations, and internal APIs for authorization, input validation, data exposure, and abuse risks.
• Build logging and monitoring that supports investigation without exposing sensitive health information.
• Perform threat modeling, manual assessment, and targeted adversarial testing of AI applications.
• Partner with engineers to remediate findings and improve product architecture.
• Contribute reusable security libraries, reference implementations, and engineering documentation.
• Support incident investigations involving AI systems or member data.
• Help improve and operationalize Function’s standards for secure AI development.

Qualifications/Skills

• Five or more years of experience across software engineering, AI engineering, product security, application security, cloud security, or related disciplines.
• Production experience building or securing AI agents, machine learning systems, data platforms, or model integrated applications.
• Strong Python and backend engineering skills.
• Understanding of authentication, authorization, data isolation, secrets management, secure API design, and application security fundamentals.
• Experience with agent tools, retrieval, memory, evaluations, model integrations, or AI orchestration frameworks.
• Ability to identify practical attack paths and translate them into engineering controls and tests.
• Familiarity with cloud infrastructure, workload identity, containers, and service monitoring.
• Experience working directly with product and engineering teams.
• Clear written communication and the ability to document technical decisions.

Your dedication to these responsibilities will directly contribute to the success of our platform and the satisfaction of our users. We are looking for a proactive, skilled, and forward-thinking individual to join our team and help shape the future of our services.

To be a strong fit, you embody our Core Values:

• Ruthless Prioritization:
• We don’t let perfect get in the way of progress.
• We move quickly to drive value, not perfection.
• We prioritize what drives impact.
• We never compromise on standards of excellence.
• Member-First, Always:
• We design and deliver like we’re caring for someone we love.
• We create calendar, actionable, human experience.
• We prioritize responsiveness, peace of mind, and outcomes.
• We empower members with truth, clarity, and care.
• One Team, Moving Fast:
• We are aligned in purpose, prioritization, and speed.
• We gather diverse perspectives to make informed decisions.
• We clear paths for each other and move fast together.
• We communicate clearly and respectfully, rallying around shared goals.
• Radical Ownership, Relentless Execution:
• We don’t just ship– we own outcomes and drive results.
• We act with urgency and precision
• We anticipate, initiate, and follow through.
• We meet challenges with grit and pragmatism.
• We embrace new tech to deliver better outcomes.
• Mission Over Ego:
• We are ruthlessly aligned to our mission– and leave ego at the door.
• We disagree and commit.
• We don't tolerate politics or withholding information.
• We operate with honesty, transparency, and respect.
• Sustained Integrity in Every Detail:
• We earn trust by obsessing over accuracy, quality, and clarity in everything we do.
• We prioritize clinical precision– data must be right.
• We sweat the details because outcomes depend on them.

Why You'll Love Working With Us

We value our team at Function and offer a competitive salary and benefits package, flexible working hours, and a dynamic work environment where creativity and innovation are encouraged. If you are a highly motivated and experienced individual who is passionate about using technology to improve people’s lives, we would love to hear from you.

At Function, we celebrate diversity and are committed to building a diverse and inclusive workforce. As an equal opportunity employer, we do not discriminate on the basis of race, color, gender identity, ancestry, religion, age, sexual orientation, national origin, disability, marital status, Veteran status, or any other occupationally irrelevant criteria.

Join the Function Health team and become a part of our mission to build a healthier future for all. Discover more about us and how we're changing the face of healthcare at Function Health .

Important Notice: Legitimate communication from the Function Health team will always come from an email address ending in @functionhealth.com . Function Health will never request personal information such as banking details or payment during the hiring process. Please be cautious of communications or job offers that come from other email domains, instant messaging platforms, or unsolicited calls. If you ever have doubts about the legitimacy of a communication, please reach out to us directly at talent@functionhealth.com .