Case study
Learnpally
E-learning platform across web and mobile. Course management, Paystack payments, background jobs for email and video processing, and PostHog analytics.
- Role
- Full-Stack Engineer
- Year
- 2024
- Status
- Live
- Stack
- React · React Native · Node.js
Overview
One product, two clients: a React web app and a React Native mobile app sharing a single Express API. I worked across the whole stack, from the course player to the payment reconciliation behind it.
What it does
- 01
Shared Express API serving both web and React Native clients
- 02
Paystack checkout with webhook-driven reconciliation
- 03
Background workers for transactional email and video processing
- 04
PostHog instrumentation across the signup and purchase funnels
The hard part
Payment webhooks arrive out of order and sometimes twice. Making enrolment idempotent — keyed on the provider reference rather than the request — was what made the flow trustworthy.
What it taught me
Instrument the funnel before launch, not after someone asks why conversion is low.