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About this role

ABOUT ACTAI

There are over 5 billion users using basic applications today such email, notes, tasks, calendar and they're not AI-native. Our mission is to build proactive applications for anyone in the world, who are not used to complex prompting. We aim to bring intelligence to conversations, errands, organising and workflows, with minimal to no prompting.

Our first application is an agent-first mobile communication app. We believe building applications that users use daily for communication, coordination and collaboration needs will help integrate AI into their lives. The net effect is to eliminate misinformation, achieve low coordination costs, enable high quality tasks and collaboration at scale with minimal or little prompting.

ROLE

You will design the detailed mechanics of how users interact with ActAI - the gestures, states, flows, and micro-decisions that determine whether an AI-driven product feels controlled or confusing.

This role is focused on HCI interaction design: how users give input, receive feedback, supervise AI actions, correct mistakes, and maintain agency over AI-driven workflows.

There are no established playbooks for interaction design in proactive AI products. You will help define new patterns from the ground up.

WHAT YOU'LL BE DOING

Design detailed interaction models for AI-driven flows, including how users initiate, monitor, pause, correct, and complete multi-step tasks.

Define interaction states for AI interfaces: idle, thinking, acting, waiting, uncertain, interrupted, failed, and recovered.

Design human-in-the-loop controls - how users review AI decisions, override actions, and stay informed without micromanaging.

Create interaction patterns for delegation, approval, correction, escalation, reversibility, and recovery.

Create detailed interaction specifications, annotated flows, and prototypes for engineering handoff.