Sincura

A luxury concierge app for The Sincura Group, rebuilt from two native apps into one Flutter codebase with AI-assisted development.

MobileiOS and AndroidFlutterAI Rewrite

Overview

The Sincura Group is a UK luxury concierge and lifestyle management company with offices around the world. Its members use the Sincura app to send concierge requests, talk to their personal lifestyle manager, and discover offers, events, and news, at any time of day.

mile.dev has been responsible for the app since April 2025. We took over two separate native apps, one for iOS and one for Android, kept them running for members, and then rebuilt them as a single cross-platform mobile app.

Sincura app home screen with inbox, requests, news, and offers

The Challenge

The app lived in two native codebases built up over several years, with white-label versions for partners on top. Every change had to be made twice.

This meant:

Every feature and fix built separately for iOS and Android
Roughly 60,000 lines of legacy code across the two apps
Partner versions multiplying the maintenance work
Slower releases and a higher cost for every change

The goal was one modern codebase that keeps everything members rely on and is far easier to maintain.

What We Built

Concierge requests by category: dining, bars, hotels, tickets, travel, and more

A private inbox for chatting with each member's lifestyle manager

Offers, events, and newsletters, filtered by region

News, weekly highlights, and city guides from around the world

Membership tiers, guest access, and membership applications in the app

Four languages and push notifications for new offers and replies

Sincura app: choose a category for a concierge request

Architecture and Delivery

The new Sincura app is a single Flutter codebase for iOS and Android, rewritten with AI-assisted development in about a month. Senior engineers analysed the native apps screen by screen, planned the new structure, and reviewed every change, so members kept everything they rely on while the code shrank to about a quarter of its former size.

The app works with Sincura’s existing backend, and a session migration keeps existing Android members signed in after the update.

One Flutter codebase for iOS and Android, replacing two native apps

About 16,000 lines of Dart instead of roughly 60,000 lines of native code

Rewritten with AI-assisted development in about a month, reviewed by senior engineers

English, German, French, and Italian

OneSignal push notifications and in-app chat with lifestyle managers

Session migration, so existing members stay signed in after the update

Sincura app architecture: from two native apps to one Flutter codebase

Outcome

The Flutter app went into open testing in July 2026 and was released in August 2026. iOS and Android now run on the same Flutter core, so every new feature and fix is built once and ships to both platforms.

The smaller codebase is easier to test, faster to change, and simpler to adapt for partner versions. mile.dev continues to develop and maintain the app for The Sincura Group.

Two native apps became one Flutter codebase, rewritten with AI-assisted development in about a month.