HEALF IS EUROPE'S FASTEST-GROWING COMPANY. Number one on the FT1000, number one on the Sifted 100. From £1m to over £100m in under three years, with a small, talent-dense team and an electric culture with day one founder intensity. Now we're aiming for £1bn in the next three. We curate the world's best wellbeing brands across The Four Pillars™: EAT, MOVE, MIND, SLEEP. That's the first chapter. THE NEXT CHAPTER IS HARDER AND MORE INTERESTING. We are moving from one market to many, from e-commerce to a technology platform, and from curating wellbeing to defining it. We are a health company, so we think we should act like one. At its fullest expression, Healf redefines what wellbeing means for tens of millions of people. About the role As Founding Engineer on the Deeper Engagement team, you will define the technical architecture that makes this possible. You will own the decisions that shape how Healf connects wearable data, behavioural signals, and personalised engagement at scale. This is a 0-to-1 role with direct access to the CTO and founder. What You Will Do - Define and build: the technical architecture for the Deeper Engagement team from the ground up - Own: wearable data integrations, backend APIs, and the mobile experience end-to-end - Make the hard infrastructure decisions: stack, data model, and system design choices that will shape the product for years - Partner with: product and the CTO to translate the engagement vision into a production system that improves continuously - Set the standard: for how the team builds, ships, and iterates as it grows What We Are Looking For - 0-to-1 experience: you have built something meaningful from scratch and understand what that demands - Strong Python backend engineering - React Native or equivalent mobile development experience - High ownership: when a problem is yours, you see it through completely - Comfort with ambiguity — you can work from a vision rather than a detailed spec Nice to Have - Wearable or health data integration experience with devices like Oura, Whoop, or Garmin - Consumer health, fitness tech, or habit-forming mobile product background - Experience building systems that personalise based on biometric or behavioural data THE DEAL Competitive and meaningful compensation package for the right person. We ask a great deal of the people who work here. We expect full ownership and a genuine commitment to give this chapter everything you have. In return, we will give you the same: everything we have, invested in your growth, your wellbeing, and the defining skills of the next decade. We have built the fastest-growing company in Europe with a team small enough that every person in it shapes the outcome. That is still true today. The next person we hire will change the trajectory of the company. IF THE MOST IMPORTANT WORK OF YOUR CAREER IS AHEAD OF YOU, THIS IS THE PLACE TO DO IT.