UX Engineer, HCI

About A1 There are over 5 billion users using basic applications today such email, notes, tasks that are not AI-native. Our mission is to build a proactive smart assistant for everyday users to bring intelligence to conversations, errands, organising and workflows, with minimal prompting. Our product focuses on achieving high reliability for long-running workflows, persistent context, and real-world task completion. The system must handle multi-step reasoning, interact with external tools, and remain reliable despite non-deterministic model behavior. Our objective is to help users complete tasks daily enjoyable with over ~90%* reduced time. Role You will sit at the intersection of design and engineering, building the AI interfaces that users actually interact with. This is not a UI maintenance role. You will prototype, test, and ship new interaction patterns for AI-driven experiences where established conventions do not yet exist. This role is focused on HCI - building interfaces that make AI behavior understandable, controllable, and useful in real workflows. What You'll Be Doing Build and prototype AI-native product interfaces across web and mobile. Create functional prototypes of new HCI interaction models, including streaming responses, multi-step task flows, real-time feedback loops, and system state visibility. Translate design concepts into working code with high attention to usability, responsiveness, and motion. Experiment with UI patterns that show progress, uncertainty, confidence, failure, and recovery clearly to users. Build interfaces that let users supervise, correct, and redirect AI behavior without micromanaging the system. Work closely with product, design, and ML teams to validate interaction ideas quickly. Contribute to frontend architecture and reusable UI components for AI product surfaces. Identify and fix usability, performance, and state management issues in AI-driven interfaces. What You Will Need Strong frontend engineering skills in React