Englo

Bangladeshi students preparing for exams like the BCS need consistent access to grammar, vocabulary, and practice questions — but reliable connectivity isn't a given. The app had to work fully offline, sync quietly when a connection appeared, and stay fast on mid-range Android devices, not flagship test hardware.

We built Englo around a Single Activity architecture with SQLite as the source of truth for offline access, syncing against a PHP/MySQL backend over a custom REST layer. A one-by-one quiz loading system with an exclude-list mechanism keeps sessions from repeating questions, and a full multi-format ad strategy — rewarded video on quiz completion, capped interstitials on chapter completion, native ads in list views — was built through dedicated AdManager and AdClickGuard classes rather than scattered SDK calls.

On the backend side, shared hosting meant working around missing PHP functions like getallheaders(), so we built $_SERVER-based fallbacks and used POST instead of HTTP DELETE where the hosting environment didn't support it cleanly.

We also built a companion Admin Panel Android app so content across all 11 database tables — vocabulary, grammar rules, quiz questions and more — can be managed directly from a phone, authenticated with a custom header key, without touching phpMyAdmin.

Englo has completed a full code audit, Firebase Crashlytics integration, Android edge-to-edge inset fixes, and a Play Store Data Safety review with a published privacy policy. What's left before submission: swapping AdMob test IDs for production ones and implementing UMP consent — the last mile before it goes live.