Custom Mobile &
Web App Development|
That Scales
CodeX Lancers is a top-rated custom web development agency and Flutter apps creator. We build custom mobile and web app development solutions that scale delivering cross-platform mobile apps, SaaS platforms & enterprise software. 250+ projects shipped for 200+ businesses worldwide.
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The Expertise Behind
Every Product We Build
End-to-end development solutions designed to build,
launch, and grow powerful digital products.
Flutter Mobile Apps
Cross-platform apps with native performance using Flutter the gold standard in multi-platform mobile engineering.
- iOS & Android from one codebase
- Custom UI/UX
- Pub.dev packages
- Performance optimized
FlutterFlow Solutions
Visual app building with FlutterFlow rapid prototyping and production-ready apps without sacrificing code quality.
- No-code to production
- Custom actions & API
- Firebase integration
- Fast delivery
Firebase
Scalable backend solutions using Firebase, FastAPI, and modern databases engineered for reliability and speed.
- Realtime database
- Cloud Functions
- Auth & Storage
- FastAPI REST APIs
Supabase Backend
Open-source Firebase alternative instant Postgres database, auth, storage, and real-time APIs with zero backend boilerplate.
- PostgreSQL database
- Auth & Row-level security
- Real-time subscriptions
- Edge Functions
ASP.NET Solutions
Scalable, secure web applications built on the Microsoft .NET stack from APIs to full-stack enterprise systems.
- ASP.NET Core
- REST & GraphQL APIs
- Azure cloud
- Microservices
WPF Desktop Apps
Rich desktop applications built with Windows Presentation Foundation pixel-perfect UIs, MVVM architecture, and seamless Windows integration.
- Desktop UI engineering
- MVVM architecture
- Data binding & XAML
- Windows integration
Angular Enterprise Apps
Scalable, enterprise-grade web apps built with Angular a battle-tested framework for complex, high-performance frontends.
- Single Page Applications
- Component architecture
- RxJS & state management
- TypeScript-first
Node.js Backend
High-performance server-side applications with Node.js scalable REST APIs, real-time systems, and microservices built for production.
- REST & GraphQL APIs
- Real-time with Socket.io
- Microservices architecture
- NPM ecosystem
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Our Clients Across Industries
Delivering digital solutions for startups, enterprises, and growing
businesses across multiple industries.
Delivering Excellence Since 2019
Real numbers from real work building world-class software for 200+ businesses worldwide.
Projects We're Proud Of
A glimpse into the products we’ve crafted to solve
real problems and create real value.
Pet Photos AI
Pet Photos AI is an AI-powered image generation application that allows users to create stylized and high-quality portraits of their pets. Users can upload pet images and transform them into artistic outputs using different AI-generated styles such as cartoon, realistic, or themed portraits. The app
TagTheBin
TagTheBin is a waste management and recycling tracking platform designed to improve sustainability practices by enabling users, businesses, and organizations to track, manage, and optimize waste disposal processes. The platform focuses on digitizing waste collection and monitoring through tagging sy
Helpie Photography App
Helpie Photography App is the service provider (photographer) side application of the Helpie ecosystem. It enables photographers to register on the platform, receive booking requests from users, and provide on-demand photography services in real time. The app acts as a workforce management tool wher
AMS Codex — Asset Management System
AMS Codex is an enterprise-grade internal asset management system designed to efficiently track, manage, and report organizational assets across their entire lifecycle. From procurement to allocation, warranty tracking, and retirement, the system ensures real-time visibility and control. Built using
Voting System
A digital peer-recognition voting platform designed for internal use at CodexLancer. It allows team members to nominate and vote for colleagues across five different award categories, promoting engagement and recognition within the team. The system ensures secure access by restricting registration t
Alumex India 2025 — Exhibition App
Alumex India 2025 – Exhibition App is a purpose-built, multi-role B2B mobile platform designed to fully digitize and operationalize India’s premier aluminum exhibition. Rather than functioning as a passive event guide or a simple schedule app, the platform is engineered as an end-to-end lead generat
Lawpoint Admin
LawPoint Admin Dashboard is a web-based system designed to manage and monitor lawyer onboarding and verification. It allows admins to review KYC documents submitted by lawyers, including identity details, bar association numbers, and specializations. The platform provides functionality to view uploa
Luqta App
Luqta is an interactive gamified rewards platform designed to engage users through quizzes, contests, and task-based activities. The application allows users to participate in various challenges and earn points or rewards by completing different levels and activities within contests. The platform of
Explore our full portfolio of 250+ successful projects
Our Open Source Packages
Contributing to the developer community with Flutter, .NET & React open-source packages used by developers around the world.
flutter anam sdk: ^0.0.1
A Flutter package for integrating Anam AI‘s real-time avatar system into your Flutter applications. Built on WebRTC, this is a Flutter port of the Anam JavaScript SDK. Features Real-time avatar video/audio streaming via WebRTC Two-way audio communication with microphone controls Text messaging with
Flutter Toggle Switch 0.0.1
flutter_toggle_switch is a single-package solution for every toggle, switch, and tab bar UI pattern you need in a Flutter app. Instead of stitching together multiple libraries or building custom painted widgets from scratch, you get one unified FlutterToggle widget with a declarative API that scales
Flutter Neumorphic UI
Flutter Neumorphic UI is a Flutter package that helps developers create neumorphic (soft UI) style interfaces easily. This design style uses soft shadows and highlights to give UI elements a smooth, slightly raised or pressed look. The package includes customizable widgets with options for themes, d
Flutter Zoom Meeting Wrapper
Flutter Zoom Meeting Wrapper is a Flutter plugin that allows developers to integrate the Zoom Meeting SDK directly into their mobile applications. It enables users to join Zoom meetings inside the app without opening the external Zoom application. The plugin supports simple SDK initialization using
Smart Actions Text
Smart Actions Text is a Flutter package that turns regular text into interactive content by automatically detecting patterns like URLs, email addresses, phone numbers, and social media handles. It allows developers to add actions such as opening links, copying text, sharing content, or visiting soci
Calendar Day Slot Navigator
Calendar Day Slot Navigator is a Flutter widget that helps developers add a customizable calendar date selector to their apps. It provides a flexible interface for selecting single dates or date ranges, making it useful for booking systems, scheduling apps, and event management features. The widget
Dart Extensions Pro
Dart Extensions Pro is a Dart utility package that provides a wide collection of extension methods and helper functions to simplify common programming tasks. It includes useful tools for working with strings, dates, lists, numbers, colors, navigation, and other everyday operations in Flutter and Dar
Rating And Feedback Collector
Rating And Feedback Collector is a Flutter package that helps developers easily add interactive rating and feedback systems to their apps. It supports customizable rating bars using icons, emojis, or custom images, with options for both full and half ratings. The package also includes dynamic feedba
Explore all our open source packages
Sharing Knowledge with
the Community
What we learn while building products - shared
with the developer & startup community.
FlutterFlow’s New Feature: App Events (A Game Changer for Scalable Apps)
Building scalable applications in low-code platforms has always been a balance between speed and maintainability. While FlutterFlow makes UI development incredibly fast, managing communication between different parts of an app could sometimes become complex. But with the introduction of App Events, FlutterFlow has taken a major step forward — bringing cleaner architecture, better performance, and a much more scalable approach to app development. The Problem Before App Events Before this update, handling communication between screens or components often involved: Passing multiple navigation parameters Managing complex global or local state Writing tightly coupled logic between screens As apps grew larger, this approach became: Hard to maintain Difficult to debug Less scalable What Are App Events? App Events introduce a decoupled communication system inside FlutterFlow. Core Idea: Trigger an event from anywhere in the app Listen and respond to that event from anywhere No direct connection between components is required. This means your app becomes: More modular Easier to maintain Much cleaner in terms of logic How It Works (Simple Example) Let’s say a user adds an item to the cart 🛒 Without App Events: Manually update cart badge Refresh product list Update summary screen Pass state across multiple screens With App Events: Trigger event → “Cart Updated” All relevant UI components automatically react That’s it. No messy logic. Key Highlights Global Events App-level events Handled across the entire application Processed sequentially Perfect for: Authentication state changes Analytics tracking Logging Local Events Scoped to specific pages or components Support multiple listeners Trigger instant UI updates Perfect for: UI refresh Component communication Dynamic interactions Why This Feature Matters App Events bring FlutterFlow closer to modern software architecture patterns, such as: Event-driven systems Loose coupling Reactive UI updates Benefits: Less complex code structure Better performance Easier debugging Improved scalability My Take This is easily one of the most impactful updates in FlutterFlow in recent times. It solves a real problem developers face when scaling apps and introduces a pattern that aligns with how modern applications are built. Final Thoughts FlutterFlow continues to evolve beyond just a UI builder — it’s becoming a serious development platform capable of handling complex applications. App Events are a big step in that direction. If you haven’t explored it yet, now is the time. #FlutterFlow #NoCode #LowCode #AppDevelopment #MobileDevelopment #Firebase #UIUX #TechUpdate #Developers
Integrating Tamara Payment Gateway in a FlutterFlow Application
In today’s digital ecosystem, integrating a reliable payment gateway is essential for delivering a smooth and secure user experience. However, building a payment system isn’t just about processing transactions — it’s about ensuring security, reliability, and compliance, all while maintaining a seamless user journey. Recently, I worked on integrating the Tamara Payment Gateway into a FlutterFlow application, creating a complete end-to-end payment workflow — from initiating transactions to handling real-time updates. The Goal The objective was to implement a secure and scalable payment flow that: Enables users to complete payments smoothly Handles transaction states reliably Ensures compliance with Tamara’s payment standards Works seamlessly across development and production environments The Implementation The integration involved connecting Tamara’s APIs with the FlutterFlow application and managing the full payment lifecycle. Key Features Implemented Tamara Checkout API Integration We used Tamara’s Checkout API to: Initiate payment sessions Redirect users to the hosted checkout page Process transactions securely Secure Payment Handling Security was a top priority. The implementation ensured: Proper API request validation Safe handling of transaction data Compliance with Tamara’s payment flow Webhook Integration for Real-Time Updates To keep track of payment status: Implemented webhooks to receive real-time updates Handled events such as: Payment success Payment failure Transaction updates This ensures the app always reflects the correct payment status. Payment Method Support Enabled support for: Visa cards Mada cards This ensures compatibility with regional payment preferences. Environment Configuration Set up both environments: Sandbox (Development) for testing Production for live transactions This separation ensures safe development and smooth deployment. Reliable Request & Response Handling Carefully managed API communication to: Handle success and failure cases Prevent duplicate transactions Ensure consistency across the payment flow Key Challenge: Hosted Checkout Limitations One of the most interesting aspects of this integration was understanding the limitations of Tamara’s hosted checkout flow. Unlike custom UI payment solutions: The payment interface is controlled by Tamara UI customization options are limited Why This Matters At first, this might seem like a limitation, but it actually ensures: Higher security standards Compliance with payment regulations Reduced risk of implementation errors Understanding these constraints helped align the integration with best practices recommended by Tamara. Final Result The final implementation delivered: A stable and secure payment experience Smooth transaction processing Accurate real-time payment updates Full compliance with Tamara’s standards Users can now complete payments confidently, knowing the system is both secure and reliable. Key Learnings Balancing UX and Security Not all payment flows allow full UI control. Sometimes, prioritizing security and compliance is more important than customization. Importance of Webhooks Webhooks are critical for: Real-time updates Backend synchronization Reliable transaction tracking Tech Stack FlutterFlow Dart Tamara Payment Gateway APIs Webhooks for real-time updates Final Thoughts This integration reinforced an important lesson: A great payment system is not just about UX — it’s about trust, security, and reliability. By combining FlutterFlow with Tamara’s infrastructure, we were able to build a solution that meets both user expectations and industry standards. If you’re working on payment integrations, always remember: Understand platform limitations Follow recommended flows Prioritize security over customization #FlutterFlow #PaymentGateway #Tamara #Fintech #MobileDevelopment #APIIntegration #Webhooks
1. How I Built a Production-Ready AI Chat App in FlutterFlow (With OpenAI + Firebase)
Introduction AI is everywhere in 2026 — but building a production-ready AI chat app is still challenging, especially when using low-code tools like FlutterFlow. In this article, I’ll walk you through how I built a scalable AI chat system using FlutterFlow + Firebase + OpenAI API. Architecture Overview My setup looks like this: Frontend → FlutterFlow UI Backend → Firebase (Firestore + Cloud Functions) AI Engine → OpenAI API Storage → Chat history in Firestore Chat Data Structure Each message is stored like this: { "userId": "123", "message": "Hello AI", "response": "Hi, how can I help?", "timestamp": "server_time" } This allows: Easy chat history retrieval Real-time UI updates Scalable structure Securing OpenAI API Never expose your API key in the frontend. Instead: Use Firebase Cloud Functions Send request → backend → OpenAI → return response This keeps your app secure. Handling Token Usage (Cost Control) AI APIs can get expensive. What I did: Limit message length Store token usage Restrict free users (daily limit) UI Challenges & Solutions Problem: Chat UI lag with many messages Solution: Pagination Lazy loading Efficient Firestore queries Final Result Real-time AI chat Scalable backend Controlled cost Smooth UI Final Thoughts FlutterFlow is powerful — but combining it with backend logic is the real game-changer.
FlutterFlow + RevenueCat: Complete Guide to Subscription Apps
Introduction If you’re building a SaaS or premium mobile app, subscriptions are one of the most reliable monetization models. But implementing subscriptions correctly is not just about adding a payment button — it involves: Secure validation Real-time status updates Handling edge cases (expiry, restore, refunds) In this guide, I’ll walk you through how I implemented a production-ready subscription system using FlutterFlow + RevenueCat + Firebase. Why RevenueCat? Instead of directly handling App Store / Play Store billing, I used RevenueCat because it simplifies everything. Key Benefits: Single integration for both iOS & Android Handles receipts, validation, and renewals Real-time subscription status via webhooks Reduces development complexity Without RevenueCat, managing subscriptions manually becomes very complex. System Architecture (Simple View) Here’s how the system works: FlutterFlow App (Frontend) User interacts with UI (Upgrade, Restore) RevenueCat SDK Handles purchase flow RevenueCat Server Validates transactions Firebase (Firestore + Cloud Functions) Stores subscription status & triggers updates Complete Subscription Flow Here’s the exact flow I implemented: 1. User Action User clicks “Upgrade to Premium” 2. Purchase Trigger RevenueCat SDK opens native purchase screen (App Store / Play Store) 3. Payment Processing Payment handled securely by Apple/Google RevenueCat validates purchase 4. Webhook Trigger RevenueCat sends event → Firebase Cloud Function 5. Firestore Update User document is updated: { "isPremium": true, "plan": "monthly", "expiryDate": "timestamp" } 6. UI Update FlutterFlow listens to Firestore Premium features unlock instantly Firestore Database Structure To keep things scalable and clean, I used this structure: users collection { "userId": "123", "isPremium": true, "plan": "yearly", "expiryDate": "timestamp" } subscriptions collection { "planId": "monthly_001", "price": 9.99, "duration": "1 month" } events collection (VERY IMPORTANT) { "userId": "123", "eventType": "PURCHASE", "timestamp": "server_time" } This helps in: Tracking revenue Debugging issues Analytics Handling Edge Cases (Most Developers Miss This) This is where most apps fail 1. Expired Subscription Check expiryDate regularly Disable premium access automatically 2. Restore Purchases Add Restore button Sync with RevenueCat Update Firestore again 3. Cancelled Subscription User cancels from App Store RevenueCat webhook updates backend Access removed after expiry 4. Refunds RevenueCat sends refund event Immediately update user access Backend Validation (CRITICAL) Never trust frontend logic Always validate subscription from backend using: Why? Prevents fake unlock hacks Ensures real subscription status Keeps your app secure Performance & Cost Optimization Here’s what I optimized: Avoid Excessive Reads Store only required subscription fields Don’t fetch full history every time Use Real-Time Listeners Smartly Listen only to user document Avoid unnecessary listeners Cache Subscription Status Reduce repeated API calls UI Best Practices (Conversion Focused) Subscription UI is not just design — it impacts revenue 💰 What worked for me: Highlight best plan (yearly) Show discount badge (Save 30%) Clear CTA: “Upgrade Now” Add trust elements (secure payment, cancel anytime) Final Result After implementing this system: Smooth and secure purchase flow Real-time subscription updates Scalable backend architecture Reduced bugs and edge case failures Final Thoughts FlutterFlow + RevenueCat is a powerful combination for building subscription-based apps quickly. But the real difference comes from: Proper backend validation Clean database design Handling real-world edge cases That’s what turns a basic app into a production-ready SaaS product.
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