AWS/Typescript Engineer in London

Founding Engineer at Healf

The builder. The one who is genuinely obsessed with what comes next. Not the technology stack. Not the architecture pattern. The thing underneath: the systems instinct, the zero-to-one appetite, the compulsion to build things that actually scale.

You might be a staff engineer at a growth-stage company or a principal at a larger tech firm who’s been quietly architecting the product others will inherit. We care about whether you have the technical depth to design a system from first principles, the product intuition to build for real users, and the conviction to make decisions with long-term consequences when no one is looking over your shoulder.

Healf is Europe's fastest-growing health platform with £100M+ revenue run-rate and 700k+ customers. We curate the world’s best wellbeing products across EAT, MOVE, MIND, and SLEEP. Today, wellbeing decisions are primitive. Customers guess, follow influencers, and try products and hope. We are building a personalised wellbeing intelligence engine that understands behavioural patterns, captures longitudinal health data, and builds smart AI agents that help customers solve their wellbeing needs.

This is a 0→1 opportunity to build a net-new business line that could drive up to £250M in annual revenue in the next three years. You will build it from scratch.

At Healf, we think engineering judgment is one of the most important forms of capital allocation in the company. Every architectural decision made in the next twelve months determines what is possible in the next five years. Every hire you make changes what the platform can become. That is why we do not see this as a conventional engineering leadership role. Defining what a next-generation wellbeing intelligence platform looks like is the real job.

What you’ll own:

• The architecture: You will design the full wellbeing intelligence stack from first principles, including backend, data, and ML systems.
• The build vs buy decisions: You will own them with authority and context.
• The engineering principles: You will define what good looks like here.
• The technical strategy: You will partner directly with the CTO.
• The team: You will grow and mentor the engineers who build alongside you.
• The product feedback loop: You will work cross-functionally with Product and Design to ship.

What you’ll deliver in the first 12 months:

• A production-grade intelligence layer powering personalised decisioning for hundreds of thousands of customers.
• A scalable data architecture designed for international growth from the start.
• A high-talent engineering nucleus built around your judgment.
• Clear product differentiation driven by intelligence, not curation alone.
• A platform that others in health tech study and try to replicate.

Why you’re Healf:

• You have built something from zero and watched it scale to meaningful usage.
• You have made platform-level decisions with long-term consequences.
• You have built or integrated ML and data-driven systems in production.
• You have influenced technical direction beyond your immediate team.
• You have operated in a high engineering bar environment.
• You are looking for the thing worth building next.

The reality:

This is hard. It requires speed and precision. It requires building for scale without overbuilding. You will sometimes be wrong, but your judgment compounds over time.

If you want to spend the next two years building something foundational that others will be building on for a decade, this is that opportunity.

Show us:

• A system you architected from zero.
• A build vs buy decision with real stakes.
• A moment where you saw how something would break six months before it did.
• An engineer you hired or developed who became better than you expected.
• Evidence that you can work at the intersection of engineering and product.

The deal:

Competitive base, meaningful equity, and direct access to leadership from day one. We ask a great deal of the people who work here. In return, we will give you the resources to build properly, a team worth leading, and the creative authority to do work that defines your career.

If the most important work of your career is ahead of you, this is the place to do it.