Interaction Designer, HCI

About the 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.

Responsibilities

• 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.
• Work with product and ML teams to translate system capabilities and constraints into usable interaction patterns.
• Test interaction designs with real users to identify where AI behavior creates confusion, distrust, or friction.
• Contribute to a shared library of HCI interaction patterns that can be reused across the product.

Requirements

• Experience as an interaction designer or senior UX designer with strong interaction design depth.
• Ability to design at the micro level — states, transitions, edge cases, and failure handling.
• Strong prototyping skills in Figma or equivalent tools.
• Systematic thinking — able to map complex AI behavior into coherent user-facing interaction logic.
• Clear understanding of HCI principles: user control, transparency, feedback, and graceful recovery.
• Experience working closely with engineers to ensure interactions are implemented as designed.
• Comfort designing for systems where output is non-deterministic and behavior can vary across sessions.
• Strong judgment on when users should be guided, interrupted, asked for confirmation, or left alone.

How We Work

The best products today in the world were built by small, world-class teams. We are a high talent density and hands-on team. We make decisions collectively, move at rapid speed, striking a balance between shipping high quality work and learning. Joining our team requires the ability to bring structure, exercise judgment, and execute independently.