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BJAK

UX Engineer, HCI

BJAK

. Build and prototype AI-native product interfaces across web and mobile.

Posted 8/2/2026full-timeSeoul • 🇰🇷 South KoreaMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates strong frontend engineering capabilities with a focus on React and TypeScript, while effectively prototyping AI-native product interfaces that prioritize usability and user experience. Combines technical skills with a deep understanding of HCI principles to create responsive and interactive designs.

Highest-signal resume keywords
Frontend Engineering SkillsReactTypeScriptHCI Interface DesignPrototyping in Ambiguous Environments

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Frontend EngineeringPrototypingUsability TestingUI Performance OptimizationAnimation Techniques
Soft Skills
Product InstinctsUX InstinctsCollaboration
Industry Keywords
AI-Native InterfacesInteraction ModelsReal-Time FeedbackUser SupervisionFrontend Architecture

Tech Stack

Tools & technologies
ReactTypeScript

About the role

Key responsibilities & impact
  • Build and prototype AI-native product interfaces across web and mobile.
  • Create functional prototypes of 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.

Requirements

What you’ll need
  • Strong frontend engineering skills in React, TypeScript, or equivalent.
  • Experience building interaction-heavy or experimental interfaces.
  • Strong product and UX instincts
  • Ability to prototype rapidly in ambiguous environments with incomplete specs.
  • Understanding of animation, responsiveness, frontend architecture, and UI performance.
  • Interest in HCI interfaces and how to design for trust, control, transparency, and recovery.
  • Comfort working at the boundary of design and engineering without clear handoffs.
  • Ability to move fast while keeping the user experience clear and usable.

Benefits

Comp & perks
  • Health insurance
  • Flexible work hours
  • Professional development opportunities