Cofounder: Product & Growth (Early Traction Startup)

Zenna; City of London; On-site; GBP 150,000 - 200,000; Full time

Job summary

An innovative health startup in London is looking for a Cofounder for Product & Growth. This role offers a unique opportunity to define a new health category by driving product growth through creative marketing strategies. The ideal candidate will have a proven track record in B2C environments, especially within wellness or lifestyle sectors. The position includes cofounder-level equity and a chance to shape the company’s growth strategy from day one.

Benefits

Cofounder-level equity

Dedicated budget for growth initiatives

Flexibility in compensation allocation

Qualifications

• Proven track record in B2C product growth, preferably in health, wellness, or lifestyle apps.
• Experience in building data-driven acquisition and retention strategies.
• Startup mindset with the ability to thrive in ambiguity.

Responsibilities

• Drive acquisition, engagement, and retention through experimentation.
• Launch and optimize marketing experiments across various platforms.
• Translate consumer insights into product features and growth mechanics.
• Craft the brand narrative for users and investors.
• Build scalable growth systems including analytics and community-driven strategies.

Skills

B2C product growth experience

Building growth loops

Data-driven acquisition strategies

Strategic mindset

Startup experience

Job description

Cofounder: Product & Growth (Early Traction Startup)

Join to apply for the Cofounder: Product & Growth (Early Traction Startup) role at Zenna

Zenna is a spin‑out from a neuroscience research organization with two decades of experience. We are building AI‑powered brainwave sound technology designed to support people living with migraines and headaches. Delivered through a simple mobile app and regular headphones, Zenna aims to make migraine care feel as natural as listening to music.

We’ve already built and launched our first version app, welcomed hundreds of engaged users in just 2 months with zero marketing spend, and are seeing users return and continue to love the experience. With early investment secured and strong organic traction, Zenna is now scaling toward its next stage of growth.

Backed by a team of Cambridge alumni and medical doctors, our mission is to harness neuroscience and AI to create safe, personalized, and instantly accessible wellness solutions—without drugs, side effects, or invasive devices.

• Massive opportunity: Migraines affect over 1 billion people worldwide, yet most solutions are slow, invasive, or ineffective.
• Breakthrough solution: Zenna blends neuroscience, AI, and sound into a mobile‑first experience that feels as natural as music.
• Strong early traction: Engaged users, organic growth, and early investment backing show product‑market fit signals.
• Category creation: A chance to define an entirely new digital health category at the intersection of wellness and consumer apps.

Why join us?

We offer a massive opportunity to help millions while building a groundbreaking product and defining a new health category.

Tasks

What you’ll do

• Game‑changing PLG strategy: Drive acquisition, engagement, and retention through rapid experimentation and iteration.
• Run creative growth loops: Launch and optimize experiments across TikTok, Reddit, influencers, wellness/health communities, and in‑app virality.
• Bridge product & growth: Translate consumer insights into product features, onboarding flows, and growth mechanics.
• Shape brand & positioning: Craft Zenna’s narrative for users, investors, and partners as we scale.
• Build scalable growth systems: From analytics and funnels to referral engines and community‑driven growth.

Requirements

What we value

• Proven track record in B2C product growth (apps in health, wellness, or lifestyle a big plus).
• Experience building growth loops and data‑driven acquisition/retention strategies.
• Strategic mindset—able to balance short‑term experiments with long‑term product vision.
• Startup DNA: resourceful, fast executor, thrives in ambiguity.
• Fundraising credibility: prior startup experience or strong academic/professional background is a plus.

Benefits

📈 The offer

• Cofounder‑level equity and the opportunity to grow into a key leadership role.
• Dedicated budget to execute growth initiatives, with flexibility to allocate across ads, operations, or your own compensation during the trial period.
• A chance to define and own Zenna’s product and growth strategy from day one, shaping both marketing and product direction.
• We’re looking for someone who can join us immediately and start driving impact right away.

👉 If you’re excited about transforming migraine care and want to be part of a world‑first migraine tech breakthrough, let’s talk.

🔗 Apply / DM us if you’re ready to build the future of migraine relief—starting now.