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An exam-prep platform rebuilt in production.

CAT preparation for Mockat, with mock tests, live classes and performance analytics.

Client: Mockat

A student working on a laptop in a library.
mockat · dashboard
Student dashboard showing the daily study plan, progress and study streak.

The context.

Mockat's exam-preparation product needed a rebuild covering lessons, tests, payments and analytics. Students' learning journeys had to keep working throughout the migration.

A first build at its limit.

The existing product needed a rebuild across its pages and APIs. The work included removing dead code and improving mobile performance while the learning and payment journeys stayed live.

  • Rebuilding a live consumer product without taking it down
  • Migrating hundreds of pages and endpoints in production
  • Mobile performance on the key student routes
  • Keeping payments and mock tests running throughout

Migrated while live.

Pages and API endpoints moved to the new stack in stages, so students kept using the product throughout. About 15,000 lines of dead code were removed on the way, and the key routes were tuned for mobile.

The system in three steps.

Inside the workflow.

Subscription plans page listing preparation packages and pricing.
Plans and checkout, rebuilt on the new stack.

Plans and checkout

Subscription plans, add-ons and checkout moved to the new stack with the learning journeys, so students could keep buying and renewing during the migration.

What the platform does.

  • Mock tests

    Full-length mocks and daily quizzes, with performance analytics.

  • Live classes and video

    Lessons and classes sit alongside daily practice.

  • Payments and plans

    Subscription plans and checkout were rebuilt with the rest of the product.

  • Leaderboards

    Leaderboards and study streaks show students their progress.

How it rolled out.

  1. Inventory

    Identify the learning, payment and reporting journeys to migrate.

  2. Migration

    Move pages and API endpoints while the product stays in production.

  3. Performance

    Measure mobile performance with Lighthouse on the key routes.

What changed.

More than 375 pages and 450 API endpoints were migrated, and Lighthouse mobile scores rose by 22 points on the key routes. Figures are from the project collateral.

pages migrated
375+
API endpoints migrated
450+
Lighthouse mobile points on key routes
+22

Decisions behind the work.

Pages and endpoints moved while the product stayed in production.

Payments moved with the learning journeys, not after them.

Lighthouse on the key routes gave a measurable mobile target.

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