App Developer - Stride in London, United Kingdom

App Developer - Stride

Manchester (Hybrid) | Reporting to CTO

Free StrideOne membership plus family and friends discount

About Stride

‘Normal’ health is no longer good enough. Normal is code for tired, stressed, barely functioning and slowly declining, and calling that a life. We think everyone has a right to better than that.

Stride is turning tracking your entire internal biology into a lifestyle, with a next generation preventative health membership. Every member builds a multi-omic health profile covering DNA, microbiome, blood biomarkers, epigenetics and oral health. That’s over 500 biomarkers, tested at least twice a year, so we can see direction of travel and not just a single point in time.

Then we turn it into what to actually do: what to eat, how to train, what to supplement, what to watch, with a coach, dietitian or physiologist alongside you.

Imagine an elite longevity concierge, at an everyday price, with no stuffy clinics to attend!

The Role

This is a zero-to-one build. Stride doesn’t have an app yet. Members currently log in through a web portal, and your job is to turn that into an installable app on iOS and Android, launched on both at the same time.

What You’ll Be Doing:

• Build and ship Stride’s first app across iOS and Android, from architecture to App Store and Play Store approval

• Decide where native is essential (login, HealthKit, push, store compliance) and where web views do the job faster

• Integrate with our existing REST API and data model, and help shape the API as the app’s needs become clear

• Build engagement into the product: notifications, check-ins and reasons to come back every week

The Biological Age Platform

• Build the member-facing experience of a genuinely novel, multi-source biological age score

• Turn huge volumes of biomarker and trend data into screens that inform without overwhelming

• Work with our scientific team so the app stays rigorous while staying simple

Cross-functional Partnership

• Partner closely with our Product Designer, from first sketch to shipped feature

• Work with the CTO on technical and UX decisions, and with the founders on functionality

• Back your decisions with data. Nobody here is precious, and the best evidence wins

Building with AI

• Use AI natively across scaffolding, code review, testing and documentation

• Bring the experience to know what you’re asking AI to build, and to spot when it gets it wrong

How We’ll Know It’s Working

• Both apps live, approved and launched together

• Members opening the app weekly, not just when results arrive

• A codebase that’s simple, scalable and easy to adjust, with nothing more complex than it needs to be

• Features built with commercial outcomes in mind, not just technical elegance

What You’ll Bring

• A track record of shipping consumer-facing apps that real users relied on, going back several years

• Experience taking an app from zero to live, ideally owning the build end to end

• Practical experience getting apps through App Store and Play Store review

• Experience presenting large amounts of data in a way that’s clear and engaging

• Fluency with AI tooling, built on fundamentals you learned before it existed

• Commercial awareness: you build for scale and adaptability, not for its own sake

• Comfort in a small, very fast-moving team where things change quickly and you’ll help shape the process

Bonus points: A successful wellness, health or fitness app, native iOS or Android depth, cross-platform frameworks (Flutter, React Native), HealthKit or Health Connect integrations, data-heavy apps (fintech, trading, gaming), or being an early or first engineer at a startup.

Why Stride

• Preventive health is where consumer health is heading, and your work helps people find out earlier, not too late

• Own the app outright, and shape the architecture rather than inheriting someone else’s decisions

• Work directly with an experienced CTO and a founder who took DNAfit through an eight-figure exit to Prenetics before a Nasdaq listing

• 25 days holiday plus bank holidays, pension, annual learning budget and your own kit