Frontend Engineer - AI-Native Web Experiences

About the role

ActAI builds proactive applications for people who are not used to complex prompting, starting with an agent-first mobile communication app. As a Web Frontend Engineer in Beijing, you will build the core web experiences of Chat, Notes, Calendar, Docs and Sheets, owning complex, highly interactive product surfaces from architecture through implementation, working closely with product, design, backend and AI engineers.

Key responsibilities

• Build major web experiences across Chat, Notes, Calendar, Docs and Sheets.
• Develop complex interactions such as real-time messaging, collaborative editing, rich-text editing, scheduling, tables and spreadsheets.
• Build reusable frontend architecture and components consistent across ActAI applications.
• Integrate streaming AI responses, proactive actions and model-driven experiences into product workflows.
• Own frontend performance, responsiveness, reliability and accessibility across browsers and devices.
• Work with product and design to turn prototypes into production quickly.

Required profile

• Strong experience building complex, production web applications.
• Experience with highly interactive products such as chat, collaboration, productivity, document editing, calendars or workspaces.
• Able to independently own features from technical design through production.
• Strong product and UI judgment with attention to interaction details.

Required skills

• React and TypeScript, with deep understanding of frontend architecture, state management, browser APIs and performance.
• Real-time systems, WebSockets, streaming APIs or collaborative interfaces.
• Tech stack: React.js / Next.js, HTML / CSS, Node.js, REST / GraphQL APIs.

The interview process involves 3 to 4 virtual or onsite interviews, evaluated by the technical team, with a prompt decision.