Case Study · 2024
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.
Overview
Codee is a coding-test practice app designed for job seekers preparing for technical interviews. The product focuses on adaptive feedback, reward timing, and lightweight gamification to sustain motivation across repeated practice sessions.
Product Visuals
