Ensembl: Community Networking App Case Study

We rescued and modernized this French community networking app — upgrading React Native, rebuilding the chat system, and fixing 200+ bugs across 50+ screens.

Website

Ensembl mobile app showing community feed and conversations

Ensembl app chat interface with file sharing

50+

App screens stabilized

200+

Bugs fixed

1 month

React Native upgrade

6+ months

Ongoing partnership

Systematic prioritization allowed us to upgrade React Native and rebuild the chat system while maintaining stability for existing users.

🎯The Challenge

Ensembl had accumulated over 200 bugs across 2 years of development by a previous team. User complaints were rising, critical features were broken, and the outdated React Native 0.76 framework blocked new feature development and security updates.

The client needed a complete rescue: stabilize the app, upgrade the framework, rebuild the broken chat system, and add community administration tools — all while maintaining service for existing users.

💡Our Solution

We took over the codebase using our mobile app development expertise and executed a systematic rescue: upgraded React Native from 0.76 to 0.81 in 1 month, fixed all 200+ bugs through rigorous testing, and rebuilt the chat system from scratch with modern real-time features.

Using our product development approach, we added 20+ new features including community administration, restricted groups, dark theme, and deep linking — transforming a broken app into a stable, modern platform.

About the Client

Ensembl

Ensembl is a French community networking mobile application that enables users to connect within neighborhoods, organizations, and interest-based groups. The app features real-time chat, content publishing, events management, and community administration tools.

Built for iOS and Android using React Native, Ensembl serves communities across France with features designed for local engagement, private group communication, and event coordination.

By the Numbers

50+ ScreensFull-featured app
6+ MonthsOngoing partnership

Before

Traditional Process

Outdated React Native 0.76

Old framework version blocked security updates and new features

200+ unresolved bugs

Critical issues, broken features, and poor user experience

Broken chat system

Unreliable messaging with missing features and frequent crashes

No admin tools

Community managers lacked moderation and member management capabilities

Technical debt accumulation

Outdated dependencies, poor code quality, hard to maintain

After

Digital Solution

Modern React Native 0.81

Latest framework with security patches and new capabilities

Stable, bug-free app

All critical bugs fixed, smooth user experience restored

Rebuilt real-time chat

Complete chat with file sharing, reactions, mentions, voice messages

Full admin panel

In-app moderation, user management, post control, join requests

Clean, maintainable codebase

Updated dependencies, TypeScript, ready for future development

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🔧

Framework Upgrade

Upgraded React Native from 0.76 to 0.81 in 1 month

Systematic upgrade of React Native framework from 0.76 to 0.81, including Firebase SDK updates, Android SDK 35 migration, and all third-party dependencies. Completed in just 1 month with minimal disruption to users through careful staging and testing.

💬

Chat System Rebuild

Rebuilt chat from scratch with modern features

Complete rebuild of the real-time chat system using Socket.io and Firebase. Added document sharing, message reactions, read/unread status, mentions, voice messages, and typing indicators. Designed for reliability and scalability with proper error handling.

🐛

Bug Fixing & Stabilization

Fixed 200+ bugs across mobile and web admin

Systematic bug triage and resolution across 50+ app screens and web admin panel. Fixed critical crashes, deep linking issues, push notification problems, UI glitches, and data sync errors. Comprehensive testing ensured stability before each release.

✨

New Features & Admin Tools

Added 20+ features including community admin panel

Built in-app community administration tools: member management, user banning, post moderation, join request handling. Added dark theme, deep linking, push notifications, events module, restricted communities, and personal storage system.

Key Features We Built

💬 Real-Time Chat

Complete chat system with document sharing, message reactions, mentions, voice messages, and read/unread indicators.

🔐 Restricted Communities

Gated access control with join requests, admin approval flow, and content protection for private groups.

🌙 Dark Theme

Complete dark mode support across all screens with dynamic color handling and proper status bar theming.

📱 Deep Linking

Universal links for both iOS and Android with environment-based configuration and proper redirection handling.

🔔 Push Notifications

Full notification system with permission flows, configurable notification levels, and unread badges.

📅 Events Module

Dedicated events tab for community calendars with cover images and per-network configuration.

Web Admin Dashboard

Alongside the mobile app, we developed features for the React-based admin panel (Pilotage) for community managers.

Personal Storage

File explorer with folder navigation, upload/download, and context menus for document management.

Groups Management

Public/restricted visibility controls, role-based permissions, and network-specific filtering.

Poll System

Anonymous poll toggle, voters list display, and visual privacy status indicators.

Technologies

React Native

TypeScript

Firebase

React

Technology Details

Mobile App

React Native 0.81 with TypeScript, React Navigation for routing, Context API for state management, and Firebase for backend services.

Backend & Real-Time

Firebase Firestore for data persistence, Firebase Storage for file uploads, Socket.io for real-time chat functionality.

Admin Dashboard

React 18 with TypeScript, Ant Design 5 component library, Nivo Charts for data visualization, and Cypress for E2E testing.

Services we provided:

Mobile App Development Product Development

🏆 Result

A stabilized, modern community networking app with upgraded framework, rebuilt chat system, comprehensive admin tools, and 200+ bug fixes — ready for continued growth and new features. The ongoing 6+ month partnership demonstrates the success of our systematic app rescue approach.

FaQ

The cost depends on the app's complexity, number of bugs, and required upgrades. Typical legacy app rescue projects range from $15,000 to $80,000+ depending on codebase size, framework upgrades needed, and feature additions. We provide free consultations to assess your app and provide accurate estimates. Our approach focuses on stabilization first, then incremental improvements.

Yes, we specialize in taking over existing codebases from other development teams or agencies. We start with a comprehensive code audit to understand the architecture, identify technical debt, and prioritize fixes. With Ensembl, we inherited a codebase with 200+ bugs and successfully stabilized it while adding new features. Our dedicated team approach ensures continuity and knowledge transfer.

We use systematic bug tracking, comprehensive testing protocols, and gradual rollout strategies. Each fix is tested in isolation, then regression tested against existing features. For Ensembl's 200+ bugs, we prioritized critical issues first (crashes, data loss), then UI/UX problems, then minor improvements. We maintain detailed documentation and use feature flags to control rollouts safely.

We start with triage and prioritization. Critical bugs (crashes, data loss, security issues) are fixed first. Then we address user-facing bugs that impact experience. Finally, we tackle minor issues and technical debt. For Ensembl, we categorized all 200+ bugs by severity, fixed critical issues in the first month, then systematically worked through the backlog while adding new features in parallel.

Firebase SDK updates often introduce breaking changes in authentication, Firestore queries, and storage APIs. We audit all Firebase usage, update to new API patterns, migrate deprecated methods, and test authentication flows thoroughly. For Ensembl, we updated Firebase SDK alongside the React Native upgrade, ensuring all real-time features (chat, notifications) continued working seamlessly.

A major React Native upgrade (like 0.76 to 0.81) typically takes 3-6 weeks for a medium-sized app with 50+ screens. The timeline depends on custom native modules, third-party dependencies, and breaking changes between versions. We upgraded Ensembl from 0.76 to 0.81 in just 1 month, including Firebase SDK and Android SDK updates. Our systematic approach minimizes risks and ensures thorough testing.

Rebuilding a chat system involves real-time messaging infrastructure (often using Socket.io or Firebase), message persistence, file/media sharing, read receipts, typing indicators, push notifications, and offline support. For Ensembl, we rebuilt the entire chat from scratch with document sharing, reactions, mentions, voice messages, and read/unread status. A complete chat rebuild typically takes 6-10 weeks depending on required features.

Yes, most clients opt for ongoing mobile app maintenance after initial rescue work. We offer flexible retainer arrangements for continued bug fixes, feature additions, OS updates, and performance optimization. Ensembl has been an ongoing partnership for 6+ months with regular sprints for new features and improvements.

Yes, in most cases major React Native upgrades can be done incrementally without full rewrites. We upgrade dependencies in stages, fix breaking changes methodically, and test thoroughly at each step. Complete rewrites are rarely necessary unless the codebase is beyond repair. For Ensembl, we upgraded from 0.76 to 0.81 without rewriting any core features — just systematic dependency updates and compatibility fixes.

Bug fixing addresses specific broken functionality or unintended behavior. Refactoring improves code structure, readability, and maintainability without changing external behavior. For legacy apps, we often do both: fix immediate bugs to stabilize the app, then refactor problem areas to prevent future issues. With Ensembl, we fixed 200+ bugs while also refactoring the chat system architecture for better long-term maintenance.

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Oleg Kalyta

Founder & AI Lead

Ensembl Community Networking Platform

🎯The Challenge

💡Our Solution