Senior UI Designer in London

About Thriva

At Thriva, we’re on a mission to close the gap between lifespan and healthspan. While people are living longer, they’re also spending more years in poor health. We help people live better now, and for longer with proactive, at‐home blood testing, connected wearables, doctor‐reviewed results, and personalised actions backed by evidence. We’re entering an exciting phase of product evolution. Our app has grown significantly over time and now supports hundreds of thousands of people with rich health data, clinical insight, and personalised guidance.

This role is about crafting an interface that reflects Thriva as a cutting‐edge, clinically credible health data company, while supporting real‐world behaviour change and long‐term wellbeing—without falling into the trap of addictive or attention‐extractive design, and staying human!

The Role

We’re building a first‐of‐its‐kind proactive health app, combining deep clinical insight with human‐centred design, conversational coaching, and increasingly sophisticated data insight. As Senior UI Designer, you’ll play a pivotal role in shaping how this experience looks, feels, and behaves.

By the time you join, we’ll have begun evolving our brand, marketing site, and app with creative UI input. You’ll collaborate closely with those creatives, alongside our product team and existing Product Designer, to extend and systemise this visual language within the app—ensuring it scales across complex health data, insights, actions, and coaching experiences.

This is a highly hands‐on role for someone who cares deeply about craft, detail, and coherence. You’ll help ensure Thriva feels like a trusted companion in someone’s health journey: supportive, clear, and motivating, showing up regularly in people’s lives in a way that encourages healthy action in the real world.

We’re a purposefully lean team. Our CTO Founder writes code, our Product Director runs user interviews, and designers are deeply embedded in product thinking. We’re looking for someone comfortable operating at both the strategic and the pixel‐perfect level who thrives in this one‐team culture.

Key Responsibilities

• Lead the evolution of Thriva’s in‐product UI, bringing clarity, warmth, and data‐backed authority to a complex, data‐rich experience.
• Ensure the app feels coherent, premium, and trusted across all touchpoints.
• Translate clinical insights, health metrics, trends, and recommendations into intuitive, calm, and engaging UI.
• Support users in navigating rich data and personalised insights without overwhelm.
• Partner with our UX designer to create experiences that encourage healthy action, habit‐building, and reflection.
• Balance engagement with restraint, avoiding dark patterns or addictive mechanics in favour of meaningful, real‐world impact.
• Work closely with our Product Designer on flows, UX intent, and interaction patterns.
• Partner with engineers to ensure high‐quality implementation and polished interactions.
• Collaborate with clinicians, data experts, and content teams to reflect accuracy, credibility, and care in the UI.
• Align with brand and marketing creatives to extend and evolve Thriva’s visual identity into product.
• Create and refine UI components, patterns, and guidelines in Figma.
• Contribute to a design system that supports speed, consistency, and ongoing iteration.
• Work closely with front‐end engineers on the design and implementation of shared UI components, contributing to a scalable component library (e.g. via Storybook or similar), and ensuring designs translate cleanly into production.
• Participate in user testing and product reviews to understand how visual design impacts comprehension, trust, and behaviour.
• Iterate based on evidence, while applying strong design judgement and taste.

About You

• You have 5+ years of experience designing interfaces for digital products, in complex or data‐rich domains.
• You have exceptional visual and interaction design skills, with a portfolio that shows polish, restraint, and thoughtful decision‐making.
• You’re fluent in Figma, comfortable building and evolving component systems, and obsessed with detail.
• You understand how design influences behaviour and care about doing this ethically and responsibly to create health impact.
• You enjoy collaborating with UX designers, engineers, clinicians, and non‐designers to arrive at the best outcome.
• You’re comfortable working independently in a fast‐moving startup environment, bringing structure to ambiguity.
• You’re motivated by meaningful work, particularly in health, wellbeing, and long‐term impact.
• You’re humble, curious, and happy to get stuck into both strategic thinking and hands‐on UI refinement.

Why Join Thriva?

• Help shape the future of proactive, preventative health.
• Play a defining role in evolving a product used by hundreds of thousands of people.
• Work with a mission‐driven, collaborative team that genuinely cares about quality and impact.
• Hybrid, flexible working (minimum 2 days per week in our Old Street office).
• Free Thriva testing (of course).
• Very competitive salary with regular reviews.
• Equity options.
• Pension contributions of 3%.
• Annual "treat yourself" budget.
• Annual learning and development budget.
• Private health cover with BUPA.
• Enhanced parental leave.