Back to Work

Adaptive Testing Engine

React NativeNode.jsRedis

01. The Challenge

"Generate balanced exams for thousands of concurrent users without repeats."

A fast-growing learning platform needed a secure test engine. Key requirements: Personalization, scale under high concurrency, and strict "no-repeat" windows for questions.

02. The Solution

We built a deterministic selection engine with a hybrid caching strategy.

Tech Stack Wins

Hybrid CachingRedis for hot-path speed + Postgres for 7-day no-repeat integrity.
React Native State MachinesRobust multi-step test flows on mobile.
GovernanceVerification-driven registration and hardened auth.

03. The Result

HighConcurrency Stability
$$$Reduced Redis Costs

Project Highlights

  • Weighted Selection Algorithm
  • Offline-ready Mobile App
  • Normalized Media Delivery

Building an EdTech platform?