JOOSUNG KIM

Codee – Coding Test Practice App for Job Seekers

Research Insights: Adaptive Learning Feedback & Engagement

Impact

  • Introduced an adaptive feedback system that reduced early-stage dropout by 15% and increased average session duration.
  • Implemented level-adjusted feedback and reward structures that strengthened learners’ sense of progress and improved mission completion rates by 20%.
  • Enhanced motivation and weekly re-engagement through optimized reward timing and gamification loops, contributing to a double-digit increase in return activity.

Role

Product Designer

Timeline

Feb – Apr 2024 (2 Months)

Team

1 Product Designer
1 Backend Dev
1 Product Manager
1 Frontend Dev

Tools

Figma
Adobe Illustrator
Adobe Photoshop
Procreate

Contribution

As the product designer, I led the end-to-end UX of an adaptive learning and coding-practice app by:

  • Designing reward and task flows focused on reducing cognitive burden and supporting repeated practice.
  • Conducting user interviews and analyzing behavioral patterns to optimize feedback timing and difficulty scaling.
  • Building a lightweight design system and interaction patterns suitable for rapid iteration across iOS/Android.
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