E2A Learning
An online learning platform for Cambridge (CAIE) AS and A Level students, spanning structured video lessons, quizzes, past papers, progress tracking, web and mobile apps, and paid course access.
Overview
E2A Learning is an online learning platform for students preparing for Cambridge International AS and A Level examinations. A student works through a subject in a structured sequence — video lessons, chapter quizzes, then past-paper practice — while a progress view shows what has been completed.
From an engineering point of view it is a multi-client product: a Next.js web application for students, a separate admin application for managing content, an Expo/React Native mobile app, and an Express API backed by MongoDB through Prisma that all of them talk to. The data model covers subjects, chapters, lessons, quizzes and attempts, solved past papers, progress records, and the commerce side — bundles, cart and checkout orders, purchases and access grants.
The interesting problems are the ones typical of a learning platform: modelling course content so it can be reordered and partially previewed for free, deciding who is allowed to see which lesson once a purchase is made, streaming video efficiently, and keeping web and mobile in sync on a single source of truth.
What it covers
- Course structure: subjects, chapters, lessons and quizzes
- Quiz attempts, solved past papers and per-student progress tracking
- Cart, checkout, bundles and purchase-based access to content
- Student web app, admin app and mobile app on one shared API
- Authentication, resumable uploads and HLS video playback
Technology
- Next.js
- React
- TypeScript
- Node.js
- Express
- MongoDB
- Prisma
- TanStack Query
- Expo / React Native
- Socket.IO
- Redis
Related writing
- Cart, Checkout and Access Entitlements for Course Platforms
How to separate orders, payments and access in a course platform — bundles, idempotent payment confirmation, and a single entitlement check that decides who sees what.
- Designing an LMS Data Model: Courses, Lessons, Quizzes and Progress
A practical data model for a learning platform — content hierarchy, free previews, quiz attempts, past-paper practice and progress tracking — with the trade-offs behind each choice.
- One Backend, Two Clients: Architecture for a Next.js Web App and an Expo Mobile App
How to share an API, validation schemas and data-fetching patterns between a Next.js web app and an Expo / React Native app without duplicating business rules.