Senior Staff Engineer

Build the Future of Wellbeing

Do Your Lifes Best Work

If modern wellbeing were redesigned from scratch it wouldnt live in a GPs office or a cluttered supplement aisle. It would be digital-first beautifully curated and powered by data that actually helps you feel your best.

Thats what were building at Healf. An ecommerce platform at the intersection of personalised health and curated wellbeing. We connect customers with the worlds most effective products across EAT MOVE MIND and SLEEP and were just getting started.

We combine culture-shaping storytelling cutting-edge health tech (like our new blood testing platform Healf Zone) and a best-in-class product experience to help people build rituals that work.

Backed by investors behind Soho House Alo Yoga Cult Beauty and Innocent were scaling fast and redefining how the world shops and lives well.

About Us

At Healf were not just a company were a movement. Founded by two brothers whose own wellbeing journeys inspired our mission to empower others Healf is built on grit determination and a shared understanding of the power of wellbeing.

Our culture is grounded in The Healf Standardfive principles that define how we work and win:

We Work Harder Than Anyone Else: Building something that improves lives takes long hours grit and sacrifice but we thrive on it. We all feel energised by what were building.

Never Settle: We challenge the status quo and push ourselves to be better every day. We never settle for mediocrity or the idea that something cant be done.

Obsession Over Talent: Talent alone isnt enoughrelentless curiosity and a drive to grow set us apart.

The Healf Lifestyle: We live what we preachour personal commitment to wellbeing fuels our professional productivity.

Stronger Together: Everyone owns their lane but we run as a unit.

With Healf Zone on the horizon were entering the next phase of our journey: closing the loop on health with personalised preventative care that unlocks longevity and optimised wellbeing. This is your chance to help build something thats not only extraordinary but a first of its kind.

The Role

Healf is growing rapidly across Web Frontend Backend and AI. As we scale our multibrand wellbeing platform toward becoming a full health-tech company were looking for a hands-on Senior/Staff Engineer who wants to play a foundational role in shaping our engineering culture systems and product experience.

This is a rare opportunity to join an early-stage engineering team where your work will have immediate visible impact. Youll build core systems influence architectural decisions mentor engineers and set the standard for how we ship high-quality products at speed.

Important: This role is not for someone who wants to step away from coding and only manage engineers.

Its for someone who loves being hands-on enjoys leading through technical direction and wants to coach and uplift developing engineers as the business continues to unlock growth.

Youll partner closely with our Head of Engineering to define engineering strategy while also shipping production code and guiding the wider team.

Location: Open to candidates based anywhere in the UK.

Where Youll Make Impact

Technical Leadership & Architecture

• Shape system architecture service boundaries data flows API contracts ADRs UI composition and BFF patterns.

• Define engineering standards and patterns alongside the Head of Engineering.

• Evolve our API and event-driven designs to support scale reliability and future product lines.

• Break down complex problems and drive clear technical direction across the team.

Hands-On Engineering

• Ship Python/FastAPI microservices and TypeScript/React (ideally ) frontends.

• Build robust backend services scalable APIs and asynchronous workflows (Kafka SNS/SQS EventBridge).

• Use (Express/Fastify/NestJS) for BFFs or edge services where appropriate.

• Back systems with PostgreSQL Redis Elasticsearch/OpenSearch ensuring performance and resilience.

• Contribute directly to AWS infrastructure through IaC (Pulumi/Terraform).

Team Leadership Through Mentorship

• Mentor junior and mid-level engineers helping them grow quickly through pairing reviews and design guidance.

• Lead by example with strong engineering habits clarity and thoughtful trade-offs.

• Play a key role in fostering a high-performing ambitious engineering culture.

Execution & Delivery

• Own major product features and technical initiatives end-to-end.

• Work with Product & Design to shape scope surface trade-offs early and maintain momentum.

• Unblock engineers quickly and drive aligned steady progress across squads.

• Communicate clearly with technical and non-technical audiences.

Reliability Observability & Governance

• Implement SLIs/SLOs and strengthen reliability practices.

• Integrate logs metrics tracing (OpenTelemetry Prometheus/Grafana Datadog Sentry).

• Add frontend observability (RUM error tracking Core Web Vitals).

• Champion AWS Well-Architected principles least-privilege IAM secure SDLC and OWASP-aware web security.

• Support data privacy and governance requirements (e.g. GDPR).

Greenfield & Modernisation

• Build out new product domains (e.g. mobile backend new wellbeing verticals health-tech features).

• Modernise our existing systems (e.g. migration to App Router typed APIs performance optimisation).

• Ensure architecture scales with business ambitions.
  

What Youll Bring

Backend Depth

• Expert Python 3.x (FastAPI/Flask).

• Strong SQL fundamentals and Postgres optimisation.

• Experience with distributed patterns: sagas/outbox idempotency retries circuit breakers.

• Strong testing discipline (pytest integration tests property-based testing).

Experience

• Building BFFs/edge APIs with Express/Fastify/NestJS.

• API design (REST/JSON; GraphQL/gRPC/tRPC is a plus).

Cloud & Infrastructure

• Strong AWS knowledge (networking compute storage IAM).

• Pulumi/Terraform Docker ECS/EKS or serverless where it fits.

• Understanding of observability systems and deployment pipelines (GitHub Actions/ArgoCD).

Leadership Through Craft

• Youve led engineers before through technical authority not by title.

• You enjoy mentoring and coaching developing engineers.

• You communicate clearly and make reasoned decisions.

• You bring calm clarity and direction during complexity.

Bias for Delivery

• You break down complexity and ship.

• You unblock others quickly and raise the teams velocity.

Bonus Points If You Have

• Tailwind design systems (Storybook) React Hook Form/Zod

• GraphQL tRPC Prisma/SQLAlchemy

• Elasticsearch/OpenSearch vector search ML-adjacent tooling

• WebSockets/WebRTC background workers/cron orchestration

• Cost optimisation and performance profiling

• Experience with LangChain/AI agents
  

Why Join Healf

Do your lifes best work: Build something that matters with a team that moves fast and aims high

Surround yourself with A talent: Youll work with high-performers who care deeply and raise the standard every day

Be a builder: This isnt a cog-in-the-machine role. Youll help shape our voice culture and growth

Wellbeing is the lifestyle: From office yoga to Healf Zone insights everything we do is rooted in our pillars: EAT MOVE MIND SLEEP

Premium Wellhub Membership: Unlimited entry to 1000s of gym yoga & fitness studios (UK Only)

Exclusive Healf Perks: 50% off all Healf products plus discounted Healf Zone blood testing.

Nest Pension: Secure your future with our pension contributions. (UK Only)

Wellbeing-Focused Workspace: Incredible Hammersmith office with great natural lighting (Optional Workspace if UK-Based)

Team Connection: Annual company-wide retreat to recharge and bond.