AWS Engineer Contract in London

Healf is Europe's fastest-growing health platform with a £100M+ revenue run-rate and over 700k customers. We curate the world's best wellbeing products across EAT, MOVE, MIND, and SLEEP. Our goal is to build a personalised wellbeing intelligence engine that understands behavioural patterns, captures longitudinal health data, and builds smart AI agents to 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 believe 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. This role is not a conventional engineering leadership role; it is about defining what a next-generation wellbeing intelligence platform looks like.

What you’ll own:

• The architecture: Design the full wellbeing intelligence stack from first principles, including backend, data, and ML systems.
• The build vs buy decisions: Own these decisions with authority and context.
• The engineering principles: Define the actual principles that govern quality, velocity, and long-term consequences.
• The technical strategy: Partner directly with the CTO and have real authority over the direction of the intelligence layer and product platform.
• The team: Grow and mentor the engineers who build alongside you.
• The product feedback loop: Work cross-functionally with Product and Design to ship via continuous experimentation.

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 through trusted judgment.
• You have operated in a high engineering bar environment where architectural thinking was respected.
• You are looking for the thing worth building next.

The reality:

This role requires speed and precision, building for scale without overbuilding, and making good decisions in conditions of genuine ambiguity. You will sometimes be wrong, but your judgment must compound over time.

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

Show us:

• A system you architected from zero, detailing the first principles and decisions made.
• A build vs buy decision with real stakes.
• A moment where you anticipated a potential failure and acted on it.
• An engineer you hired or developed who exceeded expectations.
• Evidence of working at the intersection of engineering and product.

The deal:

Competitive base salary, meaningful equity, and direct access to leadership from day one. We ask a great deal of our team members, and in return, we provide 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.