Backend engineer in digital health

Do Health is a mobile-first preventative health product, co-founded by Dr Rangan Chatterjee and built as an independent startup inside Voy - one of the UK's fastest-growing digital health companies (~2x YoY growth, over 1 million members across the UK, Germany and Brazil), already working across men's health, metabolic health, menopause, hormonal health, TRT and dermatology. Do Health is Voy's next chapter: the first product built not to treat illness, but to prevent it. We test people's blood regularly, track how it changes over time, and turn results into a personalised programme across four pillars - Eat, Move, Sleep, Relax - that helps someone make small changes they can actually keep.

• Own major backend features end-to-end - design, build, ship, monitor, iterate. Not "contribute to" - own.
• Shape architecture alongside the lead. Real technical decisions, made by you, kept or changed based on what works.
• Scale our blood testing infrastructure across the UK and internationally as we expand.
• Build production AI systems - personalisation engines that act on longitudinal health data at scale.
• Improve reliability, observability, and the foundations that everything else depends on as the product grows.
• Work directly with product, design, and clinical teams. No tickets thrown over walls.

• 5–8 years of backend experience with strong fundamentals. We care more about depth than years.
• Experience at a startup or scale-up where you genuinely owned things.
• Architectural thinking.
• You can hold an end-to-end technical conversation about systems you've built - what trade-offs you made, what broke, what you'd do differently.
• A track record of shipping reliable systems. Not just features - the boring infrastructure that keeps them up.
• Comfort with judgement calls in ambiguous situations. Most decisions here don't have a clear right answer.
• Confident, responsible use of AI tools in your workflow. Not "vibe coding" - using them as a force multiplier where they help, ignoring them where they don't.
• Будет плюсом: Strong TypeScript / Node.js experience (it's our primary stack, but we'll happily hire someone excellent in Go, Kotlin, Python or similar); Experience scaling systems to high user volumes; Exposure to ML/AI systems in production; Healthcare or regulated-industry experience

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