Full-time | Remote - US

About Zero

Zero is the world's leading fasting app, with over 10 million users on a journey toward better metabolic health. Zero has a massive audience and a trusted brand and now we're building a powerful new product to live alongside Zero. With our new product, we’re entering an exciting next chapter—where AI, coaching, and metabolic health intersect.

About the Role

We’re looking for a hands-on, full-stack Head of Design to help bring a major new product to life at Zero. You’ll lead design for our next-generation app at the intersection of AI, coaching, and metabolic health—working directly with our CEO and a small, scrappy team.

You’ll do it all: user research, UX flows, high-fidelity designs, prototyping, AI feature spec’ing, writing microcopy, and helping plan experiments. You’ll balance ambitious ideas with practical shipping, building simple, effective experiences that meet user needs and business goals.

This is a “player-coach” role: you must love doing the work yourself, not just leading it.

What You'll Do

• Own the end-to-end design of our new product: research, UX, UI, prototyping, visual design, specifications.
• Develop deep user understanding and apply it to everything you build.
• Work closely with the CEO and engineers to prioritize, spec, and ship high-quality features.
• Define and test genAI-powered product experiences.
• Create polished, usable, beautiful interfaces in Figma.
• Write user-facing copy (onboarding, prompts, notifications, etc.).
• Plan and validate experiments and analytics tracking.
• Adapt fast, balancing vision with real-world constraints.