Join a mission-driven team building wearable technology specifically for chronic illness management. Reporting to the founding engineer, you will own features end-to-end across a Flutter mobile app and GCP/TypeScript backend. You’ll help 250,000+ users track energy pacing and reclaim their quality of life while scaling a product that reached $8M ARR in just 24 months.
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Senior Product Engineer at Visible
Visible is redefining wearables by building technology for illness, not just fitness. Having scaled from zero to $8M ARR in just two years with over 250,000 users, they are now looking for a Senior Product Engineer to help lead their next phase of growth. Working in a small, high-impact team of nine, you'll own the end-to-end experience of their Flutter and GCP-based platform. If you're a T-shaped mobile engineer who wants to use your skills to help people with Long Covid and ME/CFS reclaim their lives, this Spitalfields-based hybrid role offers a unique mission and top-tier benefits.
About this role
Role overview
About the company
Visible
Healthtech20-30 employees
Visible is a health technology company that provides a mobile app and wearable heart-rate monitor for tracking activity, symptoms, and pacing for individuals with energy-limiting chronic illnesses such as Long Covid and ME/CFS. It offers tools to budget energy, receive pacing notifications, understand activity impacts, track trends in heart rate variability (HRV), symptoms, and medication, and contribute data to research.
What you'll do
What you will do
- Craft pixel-perfect mobile interfaces and complex data visualizations using Flutter to help users understand their physiological data at a glance.
- Architect and maintain robust backend systems using Cloud Functions (TypeScript) and GraphQL to handle personalization, wearable integrations, and HIPAA-ready security.
- Collaborate directly with data scientists and designers to implement smart energy-pacing tools and AI-powered features that translate wearable metrics into actionable health insights.
Who you are
Who this is a fit for
- Significant experience building and maintaining production-grade consumer mobile applications, ideally using Flutter, or a willingness to transition from expert-level React Native or Native iOS/Android.
- Strong full-stack or T-shaped engineering profile with proficiency in TypeScript, GCP, or similar cloud environments, and an interest in working with BLE/wearable hardware integrations.
- A proactive, product-minded engineer who uses AI tools to multiply their output and cares deeply about accessibility and reliability for users managing chronic conditions.
Why this role
Why this role is remarkable
- Rare opportunity to join a high-traction startup that grew from zero to $8M ARR in 24 months with a 4.8-star rated product used by over 250,000 people.
- Backed by top-tier investors including Octopus Ventures, Calm/Storm, and Hustle Fund, you'll be part of a small, elite product team of nine where your work has immediate, life-changing impact.
- Exceptional culture of trust and autonomy with a generous stack of benefits including a dedicated budget for the latest AI/LLM tools (Copilot, Claude Code) and international team off-sites.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
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