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CodeCrafters
Exam-prep platform for university students: practice tests, course materials and a per-subject marketplace with instant PayOS checkout.
Apr 2025 – present
Lead developer
Technologies Used
Next.jsTypeScriptMongoDBMongooseNextAuthPayOS
Project Overview
CodeCrafters helps students prepare for exams subject by subject: timed practice tests, recorded lessons and study material, grouped by semester. Access is sold per subject in three packages (tests, recordings, or both), and access is granted automatically the moment a bank transfer clears.
Key Features
- Timed practice exams with results and history
- Per-subject marketplace with Test, Record and Combo packages
- PayOS QR / bank-transfer checkout with automatic access on payment
- Admin area for exams, materials and purchases
Technical Challenges
- Payment webhook as the primary fulfilment path, since buyers often never return to the browser after paying in their banking app
- Server-side pricing so the client can never change what it pays
- A cron job that revokes expired access
Need something similar built?
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