Senior Full Stack Engineer

Mitra Bio is building the future of skincare through epigenetics, longevity science, and data. Backed by Khosla Ventures, Illumina, and Innovate UK, we help people better understand their skin over time using simple, non-invasive skin sampling and advanced data analysis. Our goal is to make highly personalised skincare more effective, accessible, and science-driven.

We’re looking for a full-time Senior Full Stack Engineer with exceptional frontend and product instincts to help shape the next generation of our customer experience. This is not a “ticket-taking” engineering role. We’re looking for someone senior, scrappy, creative, and deeply product-minded — someone who cares as much about the elegance of the customer experience as the quality of the code underneath it. You’ll help build a luxury-grade digital product used by real consumers, stretching across science, beauty, AI, and commerce. You’ll work closely with Product, Engineering, Data Science, and leadership to translate complex platform capabilities into seamless, intuitive experiences. One day you might be refining a high-performance frontend flow; the next, improving API architecture, building a Backend-for-Frontend layer, or shaping how our platform evolves as we scale. We’re especially excited by engineers who thrive in ambiguity, move quickly without sacrificing quality, and enjoy ownership. The right person will be equally comfortable obsessing over UX polish, collaborating on backend systems, contributing to architectural decisions, and rolling up their sleeves to ship.

What You'll Own:

• Building and delivering a premium, customer-facing web experience with exceptional UI/UX quality, performance, and responsiveness
• Developing frontend integrations and Backend-for-Frontend (BFF) services connecting our applications with APIs, e-commerce systems, and internal platforms
• Driving frontend quality through testing, CI/CD, code reviews, and engineering best practices
• Contributing to technical and product direction across frontend and backend architecture

What We’re Looking For:

• 5+ years of experience as a full-stack or frontend-focused engineer
• Strong understanding of modern frontend development and product-focused UI/UX
• Highly proficient in TypeScript and modern JavaScript frameworks (ideally Next.js/React)
• Experience integrating APIs and building scalable web applications
• Experience with Shopify, headless commerce, or customer-facing e-commerce products
• Strong engineering fundamentals across testing, version control, CI/CD, and code quality
• Strong user empathy and a sharp eye for detail
• Works well in fast-moving startup environments where priorities evolve quickly
• Must be based in the UK.

We’re particularly interested in hearing from people who have built polished consumer experiences, thrive in startup environments, and want to help create something category-defining.

Why Join Us:

• 25 days of annual leave, plus public holidays in England and Wales
• A fast-growing, mission-driven startup at an early stage and a product that directly impacts consumers in a meaningful way
• High ownership, autonomy, and direct impact on the product and customer experience
• A collaborative, ambitious team of scientists, engineers, and operators building something genuinely new
• Strong in-person/hybrid culture, fast feedback loops, and zero bureaucracy
• Backing from world-class investors
• A fast-moving environment where great ideas can quickly become reality
• Opportunity to shape both the product and engineering culture from the ground up

Interview Process:

• 30 minute screen with Talent Acquisition
• 1 hour meeting with the Engineering Team
• 45 minute meeting with the Data Team

How to Apply:

Please submit your CV and a short cover letter explaining why you’re interested in Mitra Bio and what excites you about this role.

Diversity, Equity, and Inclusion:

At Mitra Bio, we believe the best ideas, products, and breakthroughs come from diverse perspectives and lived experiences. We are committed to building an inclusive environment where people feel respected, supported, and empowered to do their best work. We welcome applicants of all backgrounds, identities, experiences, and ways of thinking — including those who may not meet every qualification listed in the job description. If you’re excited about the role and believe you could make an impact, we’d love to hear from you. We are committed to creating a fair and accessible hiring process and building a team that reflects the diverse communities we serve.