Frontend Engineer for Real-Time AI Collaboration

Apply; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

ActAI is seeking a Web Frontend Engineer to build core web experiences like Chat, Notes, Calendar, Docs and Sheets. You will own complex, interactive surfaces from architecture through production, collaborating with product, design, backend and AI engineers to integrate AI natively into user workflows.

The role focuses on delivering fast, reliable, accessible experiences with real-time messaging, collaborative editing and scheduling features, using React, TypeScript and modern frontend tech.

Qualifications

• Strong experience building complex, production web applications using React, TypeScript and modern frontend technologies.
• Deep understanding of frontend architecture, state management, browser APIs, and performance.
• Experience building highly interactive products such as 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 details.
• Able to independently own features from technical design through production.

Responsibilities

• Build major web experiences across Chat, Notes, Calendar, Docs, and Sheets.
• Develop complex interactions including real-time messaging, collaborative editing, rich-text editing, scheduling, tables, and spreadsheets.
• Build reusable frontend architecture and components that work consistently across ActAI applications.
• Integrate streaming AI responses, proactive actions, and model-driven experiences directly into product workflows.
• Own frontend performance, responsiveness, reliability and accessibility across browsers and devices.
• Work closely with product and design to take ideas from prototype to production quickly.

Skills

React

TypeScript

Frontend architecture

WebSockets

UI/UX design

Tools

HTML/CSS

Next.js

REST/GraphQL

Node.js

Job description

ActAI is seeking a Web Frontend Engineer to build core web experiences like Chat, Notes, Calendar, Docs and Sheets. You will own complex, interactive surfaces from architecture through production, collaborating with product, design, backend and AI engineers to integrate AI natively into user workflows.

The role focuses on delivering fast, reliable, accessible experiences with real-time messaging, collaborative editing and scheduling features, using React, TypeScript and modern frontend tech.