Backend engineer in preventative health

Do Health; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Equity

Job summary

Do Health is hiring a Staff Backend Engineer as part of the founding team. You will own major backend features end-to-end, shape architecture, and make real technical decisions. Scale our blood testing infrastructure across the UK and internationally as we expand.

Build production AI systems for personalization at scale and collaborate directly with product, design, and clinical teams. We value depth over years and strong fundamentals in a startup setting.

Qualifications

• 7–9 years of backend experience with strong fundamentals.
• Startup/scale-up ownership of systems is valued.
• Ability to discuss end-to-end trade-offs and system reliability.

Responsibilities

• Own major backend features end-to-end: design, build, ship, monitor, iterate.
• Shape architecture and make real technical decisions.
• Scale blood testing infrastructure across the UK and internationally.
• Build production AI systems for personalization at scale.
• Improve reliability and observability while collaborating with product, design, and clinical teams.

Skills

End-to-end ownership

Backend architecture

TypeScript / Node.js

Go / Kotlin / Python

AI / ML in production

Tools

Node.js

TypeScript

Go

Kotlin

Python

Job description

Описание:

We're hiring a Staff Backend Engineer as a part of the founding team at Do Health - a mobile-first preventative health product co-founded by Dr Rangan Chatterjee, built as an independent startup inside Voy.

Задачи:

Own major backend features end-to-end - design, build, ship, monitor, iterate. Not "contribute to" - own. Shape architecture. 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.

Требования:

7–9 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

Условия:

Genuine equity in a product with real upside, not lottery-ticket equity at a company that may never exit Startup velocity with grown-up backing - Voy isn't going anywhere, so you're not betting your mortgage on Series A survival A product that matters. Preventative health is one of the few areas where building software actually changes outcomes, not just engagement metrics. A high technical bar from day one. You're not joining a team that needs convincing to do things properly. Direct access to leadership - your work, your decisions, your name on them.