An EdTech app lives or dies on three technical axes: video streaming quality (on patchy mobile data), test-engine reliability (latency under 200ms on mid-range Android), and offline capability (students in tier-2/3 study with intermittent connectivity). Add to that payment integration, doubt-solving interfaces, progress tracking and cohort analytics. We build in React Native for most EdTech apps (shared iOS/Android, faster iteration) with native modules for video rendering and biometric login, on a serverless or lightweight-backend architecture that scales through exam-season traffic spikes. Device reality drives the engineering: the app must stay usable on four-year-old Android hardware with limited storage, which caps bundle size, memory use and what a screen can assume about the network. Building and testing only against a current flagship is the commonest reason an education app performs badly for the students it serves.
EdTech apps have specific technical constraints. Video streaming: adaptive bitrate (HLS or DASH), offline-download for lesson content, Widevine or FairPlay DRM where content protection matters (certification courses, premium content). Test engine: local question rendering, server-validated submission, anti-cheat basics (lock screen during test, detect app backgrounding), offline mock-test with sync on reconnect for tier-2/3 users. Doubt solving: in-app Q&A surfaces, optional live video or chat, teacher routing. Payment: Razorpay for Android webview + native SDK on iOS, Apple IAP mandatory for in-app purchases of digital content (per App Store Review Guidelines 3.1.1) - we handle both flows. Progress and cohort analytics: Mixpanel, Amplitude or PostHog instrumentation, with course-completion, lesson-watch-time, test-attempt and cohort-engagement dashboards from day one. Push notifications: trial-end reminders, mock-test schedules, live-class alerts - high-value for retention, low-overhead to implement.



























































