Head of Organic Growth

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 the limitations of traditional care and enabling comprehensive, continuous insight into human biology. Function has been recognized as one of Fast Company’s Most Innovative Companies of 2024, and is venture-backed by Redpoint and other leading venture firms. Over half a million members have joined Function to take control of their health.

Through comprehensive lab testing, MRI and CT imaging, longitudinal data, and guidance from AI and clinical teams, Function gives members a complete and continuous view of their health — and the clarity to act on it. Through acquisitions across imaging, mobile phlebotomy, and supplement tracking and optimization, Function is building an integrated health platform that spans the full path from testing to health clarity to daily action.

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 Head of Organic Growth, you will own the product-led and content-led strategies that compound our member growth without relying on paid channels. This is a high-leverage, execution-first role for someone who moves fast, thinks in systems, and builds with AI at the center of everything they do.

We are at the stage right before Function = Health becomes a common mental shortcut. Your job is to make Function the default answer wherever people ask health questions — Google, AI assistants, YouTube, and their own family group chats.

You will own three pillars:

Increase member-to-member spread through referral programs, in-product sharing moments, and social proof mechanics that turn our members into our most effective channel.

Maximize conversion and revenue through website, app, product, and lifecycle funnels — from first touch to paid member to advocate — continuously testing, learning, and improving.

Build and maintain organic discovery authority across traditional search, AI-driven answers, and YouTube — the world's second-largest search engine — ensuring Function surfaces where and how people research their health.

Key Responsibilities

You will report directly to the VP of Growth and lead the three organic growth pillars that determine how Function scales sustainably. This is not a strategy-and-slide-deck role. You will be deep in the work — running experiments, writing briefs, reviewing funnels, and shipping — while building the team and systems around you. You will collaborate closely with Product, Lifecycle, and Creative leadership.

VIRALITY & K-FACTOR

• Design, launch, and iterate on referral programs that meaningfully increase k-factor, building mechanics into the product and member experience.
• Map and shrink viral cycle time: instrument every referral surface, identify where member-to-member spread breaks down, and compress the time between a member's first great experience and their first successful referral.
• Partner with Product to build shareable moments natively into the experience — health is multiplayer, and moments like biological age results are made to be shared. Turn members into our most effective growth channel.

FUNNEL & CRO

• Guide conversion from account creation to paid member: identify friction points, prioritize the highest-leverage interventions, and close the gap through structured experimentation.
• Lead A/B testing cadence across web, checkout, onboarding, and lifecycle, with clear statistical discipline and fast learning loops.
• Instrument and recover drop-offs at every funnel stage, segmenting by cohort, persona, and intent signal to design recovery flows that bring high-intent leads back before they go cold.
• As Function expands access with lower-friction entry points, own the organic loops that convert new audiences into paying members.

SEARCH EVERYWHERE: SEO, GEO & YOUTUBE

• Build Function's authority in the category it's creating — own the health education queries that pull people toward continuous, proactive health before they've ever heard of us.
• Ensure Function shows up where and how people search, across traditional eng