Frontend Engineer (React/ TypeScript/ Next) - AI-Native Productivity Start-up

Frontend Engineer | AI-Native Productivity Start-up | Remote-first (London office available)

More than 5 billion people use basic email, notes, tasks and calendar apps that aren't AI-native. Our client is a well-funded, AI-native start-up building proactive applications for people who aren't used to complex prompting. The focus is reliable long-running workflows, persistent context and real-world task completion. The goal is to organise anyone's life.

The role

You will build the core web experiences across Chat, Notes, Calendar, Docs and Sheets. You'll own complex, highly interactive product surfaces from architecture through implementation, working closely with product, design, backend and AI engineers so that AI is a native part of how users communicate, write, organise and work.

What you'll own

Major web experiences across Chat, Notes, Calendar, Docs and Sheets

Real-time messaging, collaborative editing, rich-text editing, scheduling, tables and spreadsheets

Reusable frontend architecture and components shared across the company's applications

Streaming AI responses, proactive actions and model-driven experiences built directly into product workflows

Frontend performance, responsiveness, reliability and accessibility across browsers and devices

Taking ideas from prototype to production quickly, alongside product and design

What we're looking for

Strong experience building complex, production web applications in React and TypeScript

Deep understanding of frontend architecture, state management, browser APIs and performance

Experience building highly interactive products: chat, collaboration, productivity, document editing, calendars or workspaces

Experience with real-time systems, WebSockets, streaming APIs or collaborative interfaces

Strong product and UI judgment, with attention to interaction detail

Able to own features independently from technical design through to production

Tech stack

TypeScript, React / Next.js, HTML / CSS, WebSockets and streaming APIs, Node.js, REST / GraphQL

A small, hands-on team with high talent density. Decisions are made collectively, the pace is fast, and the balance is between shipping quality work and learning.

Fully remote with London Office (entirely up to you)

Competitive base + Equity