Founding Frontend Engineer

Crewmates; United Kingdom; On-site; GBP 50,000 - 70,000; Full time

Job summary

Crewmates in the United Kingdom is seeking a frontend engineer to enhance a modular product that emphasizes user experience. You will own the frontend architecture, ensuring seamless interaction across habit trackers, calendars, and more.

The ideal candidate has strong React and TypeScript experience, competently builds collaborative features, and possesses a keen eye for design. Compensation is competitive with equity opportunities.

Qualifications

• Strong experience with React, TypeScript, and modern frontend tooling.
• Comfort with real-time systems — presence, live sync, the kind of UI that feels multiplayer.
• An eye for interaction design to improve the user experience.

Responsibilities

• Own the frontend architecture and build collaborative real-time features.
• Ensure the product feels cohesive and emotionally engaging.
• Obsess over micro-interactions to make social features lively.

Skills

React

TypeScript

real-time systems

interaction design

Supabase

Job description

You’ll be the technical backbone of a product that lives and dies by how it feels in the hand. The core challenge is making a modular system — habit trackers, shared calendars, to-do lists, and more — feel like one cohesive, real-time experience rather than a collection of widgets. You’ll own the frontend architecture, build real-time collaborative features, and obsess over the micro-interactions that make social features — streaks, nudges, reactions — feel alive rather than mechanical. This is a mobile-first product where every tap carries emotional weight. Stack: Next.js, TypeScript, Supabase, Tailwind CSS.

What we’re looking for

• Strong experience with React, TypeScript, and modern frontend tooling
• Comfort with real-time systems — presence, live sync, the kind of UI that feels multiplayer
• An eye for interaction design. You don’t just implement specs — you notice when a transition feels wrong or a loading state breaks the emotional flow
• Experience with Supabase, Firebase, or similar backend-as-a-service platforms
• You’ve built something collaborative before — a shared editor, a multiplayer feature, a social feed — and you understand the edge cases that come with multiple users touching the same data

Compensation

We pay competitively and offer founding-level equity — this is a build-the-company role. Compensation is salaried and open to negotiation based on experience and what you bring to the table.