US-Based Taekworld Master Replaces an Outdated App with a Flutter Rebuild and Real-Time Push Notifications by UncannyCS

Taekworld Master is a mobile app for martial-arts school owners, called masters, on the Taekworld platform. Masters sign in securely, view their dojang statistics, review new student applications and trial members, and get push notifications with an in-app inbox. Each master can also pick the notification sound they want to hear.

A previous developer built the existing app, and it was hard to maintain. The iOS and Android versions behaved differently, and the Android notifications were unreliable.

Taekworld brought in team UncannyCS to rebuild the app in Flutter for both platforms, replace the old notification system, and release the result as an update to the existing App Store and Google Play listings. The aim was an app that alerts masters on time and a codebase the client’s own team can look after.

The App Was Outdated and Inconsistent

The previous developer left behind code that was difficult to maintain, with unused and half-finished parts. The iOS and Android versions also behaved differently.

Android Notifications Drained the Battery

The Android app checked the server every 10 seconds instead of using push notifications. This used more battery and still led to delayed or missed alerts.

Masters Could Not Choose Their Alert Sound

Masters needed a male or female voice for their alerts. That sound had to play in every state: app open, in the background, closed and phone locked, on both iOS and Android.

Notifications Did Not Lead Anywhere Useful

Tapping a notification opened the website in a browser, not the right screen in the app. The badge count also did not match the number of unread notifications.

The New App Had to Fit the Existing Store Listings

Current users needed to get the app as a normal update. The Google Play listing used the previous developer’s package ID, and the App Store version supported iPad, which the update had to keep.

The Client Needed to Own the App

Taekworld’s team wanted to build, release, and maintain the app themselves. That meant clear release steps and documented notification settings, so later changes would not break alerts.

We rebuilt the app as one Flutter codebase for iOS and Android, using a feature-first Clean Architecture with Riverpod and Dio. Sign-in tokens are stored in the iOS Keychain and Android Keystore.

Logout and account switching clear one user’s data so it never reaches another on a shared device. We also set up separate test and production environments.

Real-Time Push Notifications

Firebase Cloud Messaging replaced the 10-second polling on both platforms. Alerts arrive whether the app is open, in the background, closed, or the phone is locked.

Notifications missed while a phone was offline are recovered from the server’s pending queue. We tested on physical devices, including under Samsung’s strictest battery restrictions.

Selectable Notification Sound

Masters choose a male or female voice in the app. The choice is saved on the device and sent to the server with each device registration, so the server sends the matching sound.

On Android, each voice has its own notification channel, created at launch, so the sound plays even when the app is closed. The voice files are bundled in the iOS app and protected from removal in Android release builds. We checked both voices in every app state on both platforms, and the client confirmed them.

Actionable Notifications and an In-App Inbox

Tapping a notification now opens the matching application inside the app. A new inbox lists notifications, and the badge counts only unread items.

Store Compliance and Release

The Google Play build went out under the existing package ID, so current users received a normal update.

iPad support stayed, with the portrait-only design and full-screen mode. Android release signing was hardened so a build can’t be signed with a development key. Production builds were then released to both stores.

Quality Assurance and Hand-Over

All 35 items from the client CTO’s review were resolved, each as its own pull request with explanatory code comments. We found and fixed the root cause of an intermittent iOS issue on locked devices, confirmed through device logs and verified by the client.

We ran 94 automated tests covering session handling, offline behavior, account switching, and logout. The hand-over pack includes build steps for both stores, Firebase setup, signing-key guidance, and rules for changing notification sounds safely, with a tagged final release.

Version 2.0.0 Released to Both Stores

The new app went live as an update to the existing App Store and Google Play listings. Current masters received it without having to install anything new.

Polling Replaced with Real-Time Push

Android no longer checks the server every 10 seconds. Alerts now arrive through Firebase, reducing battery drain and removing delays.

The Selected Sound Plays Every Time

A master’s chosen voice plays on every notification, in every app state. This works the same way on iOS and Android.

Notifications Open the Right Screen

Tapping an alert takes the master to the matching application in the app. The badge now shows the real number of unread items.

One Maintainable Codebase

A single Flutter codebase serves both platforms, so features no longer behave differently on iOS and Android. Changes are easier to make and test.

Every Review Item Resolved

We closed and verified all 35 items from the client’s review on the client’s own devices. Each fix sits in its own pull request, so the work is easy to trace.

A Full Hand-Over

Taekworld’s team has the documentation, release steps, and notification rules they need. They can now maintain the app without outside help.

Taekworld Master replaced an outdated, inconsistent app with a modern Flutter app for iOS and Android. The old Android polling is gone, and alerts now arrive reliably, play the master’s chosen sound, and open the right screen with an accurate badge.

Releasing under the existing store listings meant masters got the new app as a normal update, with no disruption. The pull-request-per-fix review, thorough device testing, and detailed documentation give Taekworld a dependable app today and a strong base to extend it later.