Looking for Experienced Flutter Developer (API, WebSocket, WebRTC, JavaScript Injection in WebView)

@Microlent

Hello, I’m Mike, I’ve built complex Flutter applications that rely heavily on WebView control, JavaScript injection, real-time sockets, and WebRTC-based communication. Your architecture, where Flutter and injected JS must work as a tightly coordinated layer, is exactly the type of challenge I enjoy solving. Here’s how I’d approach it: • Implement structured JS injection using WebViewController with controlled lifecycle handling • Set up secure two-way communication via JavaScript channels and message bridges • Manage dynamic DOM manipulation and runtime script execution safely • Integrate REST APIs with proper state management • Implement WebSocket for real-time updates with reconnection logic • Configure WebRTC for live communication with signaling, ICE handling, and media stream control • Ensure clean architecture and modular separation between Flutter layer and JS logic I also focus on debugging JS inside WebView environments, handling edge cases across Android/iOS, and optimizing performance for real-time features. If helpful, I can outline a technical approach for stabilizing the Flutter–JS bridge and WebRTC layer before we begin. Best, Mike

@OutsourceMan

⭐⭐⭐⭐⭐ Dear Valuable Client, CnELIndia, led by Raman Ladhani, can seamlessly execute your Flutter project with expertise in WebView JavaScript integration, WebSocket real-time communication, and WebRTC implementation. We will start by auditing your existing Flutter codebase and mapping all JavaScript interactions within WebView to ensure stable two-way communication. Next, we’ll implement and optimize REST API and WebSocket integrations for real-time features, while handling dynamic JS injection efficiently. Our team will also focus on clean, scalable Flutter code, performance tuning, and thorough debugging of JS inside WebView. With proven experience in complex WebView-based applications and advanced Dart/JavaScript skills, we ensure reliable, maintainable, and high-performance delivery aligned with your project requirements. We are ready to begin immediately and provide continuous updates throughout the development cycle.

@softsolution2000

I have extensive experience in PHP, JavaScript, Mobile App Development, HTML5, and jQuery/Prototype, making me a perfect fit for the project "Looking for Experienced Flutter Developer". I am confident in my ability to handle REST APIs, WebSocket, WebRTC, and JavaScript injection in WebView. I am open to adjusting the budget after discussing the full scope of the project, and I am eager to start working on this exciting project. Please go through my profile, which showcases 15 years of experience and a commitment to client satisfaction. Let's discuss the job details and get started.

@rahuliitm69

Hi there, I am an experienced Flutter developer with strong hands-on expertise in REST API integration, WebSocket-based real-time features, WebRTC, and advanced JavaScript handling inside Flutter WebView. I have worked on projects that required injecting custom JavaScript into WebView, managing JavaScript channels, handling two-way communication between Flutter and JS, and dynamically controlling web content. I am comfortable debugging JavaScript inside mobile WebView, optimizing performance, and implementing WebRTC for live communication scenarios. I would request to connect so we can review your current implementation and discuss how to structure the WebView and real-time architecture efficiently. Thanks, Rahul A.

@neerajdhameliya

Hello, I see you need a Flutter developer to handle WebView JavaScript injection, WebSocket real-time features, and WebRTC integration while keeping your app stable and performant. I have hands-on experience with Flutter WebView, JavaScript channels, two-way Flutter, JS communication, API integration, WebSocket, and WebRTC. I focus on clean, maintainable code and dynamic content control inside WebView. Here’s how I’ll approach it: -> Review your Flutter project, WebView setup, and JS injection points -> Implement and test real-time WebSocket features and WebRTC integration task-by-task -> Debug JS inside WebView and optimize performance for mobile -> Provide clear commits and a short changelog for each update Quick Question: Are you planning to inject scripts into a third-party site you don't control, or is this a proprietary web app where we can modify the source code to better accommodate the Flutter hooks? Best regards, Niral

@mrresearcher99

Hi there, I’ve reviewed your Flutter app requirements and would love to help. With 5+ years of experience in cross-platform development, I specialise in clean UI, smooth performance, and robust API integration. I’ll begin with clear planning, share regular progress updates, and ensure the app is fully tested before launch. Let’s connect to discuss your vision — I’m ready to get started! Best, Bhargav Flutter Developer | Android & iOS Expert

@mahig47

Hello I am a senior Flutter mobile app developer having 4+ years of experience in services for "iOS & Android Application" and totally I have experience and expertise of 7+ years in Mobile applications in the various domains in addition to various databases with Creative Designs and best coding techniques from the very beginning until the end. Flutter Ability Set: • Personalized iOS/Android App • App prototyping prototypes • Developing the Flutter App • Including new functions • Widgets for Flutter • UI Flutter • Fixing Flutter UI • Fixing bugs in the Flutter app • Integration of API • Integration with Google Maps • Methods for In-App Payment I will be available full-time for the work and available until you are satisfied with the work. Quality coding, Efficient Solutions for fixing bugs, and available for quick communication during the development period. Please let me know if you require any additional details from my end. I will be happy to share it with you. Thank you for your time and consideration. With Regards, Nikita Gupta

@vishal1145

Your WebView-JavaScript bridge will become a maintenance nightmare if you're not handling message serialization correctly. I've debugged three Flutter apps where developers injected JS without proper error handling, and all three crashed when the webview reloaded mid-transaction. Before architecting the solution, I need clarity on two things: Are you using JavaScriptChannels or evaluateJavascript for bidirectional communication, and what's your fallback strategy when WebSocket connections drop during WebRTC calls? Here's the architectural approach: - FLUTTER WEBVIEW + JS INJECTION: Build a typed message protocol using JavaScriptChannels with JSON schema validation to prevent runtime crashes when JS and Dart exchange data. - WEBSOCKET + WEBRTC: Implement a state machine that handles reconnection logic and switches between WebSocket signaling and TURN servers when peer connections fail. - REST API INTEGRATION: Use Dio with interceptors for token refresh and request queuing to prevent API calls from blocking the UI thread during heavy JS execution. - JAVASCRIPT EXECUTION: Set up a sandboxed JS environment with postMessage handlers and promise-based callbacks to avoid blocking the main isolate. - PERFORMANCE OPTIMIZATION: Implement lazy loading for WebView content and debounce JS injection calls to reduce memory spikes on low-end devices. I've built four Flutter apps with complex WebView architectures, including one that handled 50K concurrent WebSocket connections for a live streaming platform. I don't take on projects where the JS-Dart communication layer isn't clearly defined. Let's schedule a 15-minute technical call to walk through your current implementation and identify bottlenecks before we start refactoring.

@arbu1499

Hi, Your project clearly demands deep control over Flutter WebView + injected JavaScript, especially for two-way communication, real-time WebSocket handling, and WebRTC live features. I have strong experience managing JS channels, dynamic JS injection, callback bridges, and debugging complex WebView-based apps where Flutter and JavaScript must stay perfectly in sync. I can ensure clean architecture for REST APIs, socket stability, and optimized WebRTC performance while keeping the codebase scalable and maintainable. Real-time reliability and structured communication layers will be my priority. Looking forward for your positive response in the chatbox. Best Regards, Arbaz H

@swajantalukdar

I've built WhatsApp and Facebook Messenger-style real-time communication apps using WebRTC, WebSocket, and Flutter WebView with JS injection — this is exactly what I do best. Here's what I bring: WebView & JS Injection — Built production Flutter apps with custom JavaScript injection, two-way Flutter-JS communication via channels and callbacks, and dynamic web content control. I understand the timing, bridging, and error handling pitfalls inside out. WebRTC — My strongest area. Developed multiple live communication apps handling peer-to-peer connections, signaling servers, STUN/TURN configuration, media stream management, and call quality optimization. I know the full pipeline from offer/answer negotiation to ICE candidate handling. WebSocket & Real-Time — Implemented live chat, real-time data sync, and presence features with robust reconnection logic and heartbeat mechanisms. REST API — Extensive experience with authentication, error handling, pagination, and offline support in Flutter. My approach for your project: - Understand your existing codebase and architecture first - Set up clean JS injection patterns with proper Flutter-JS bridges - Implement WebRTC with solid error handling and fallbacks - Clean, scalable, well-documented code following best practices Available to start immediately. Let's jump on a quick call to discuss your requirements in detail.

@nancydeveloper

Hi, As per the job description, I understand that you are looking for an expert mobile app developer for your respected Project. I am working as a android app and flutter Developer from the past 7+ years. In addition to development, I have a very good sense of designing also that helps me to make attractive and user-friendly websites and web apps. I’m able to develop the websites and mobile apps in android. I can make and customize any kind of application. I do my best to make my clients satisfied with my work. Budget will decide after all discussion.

@ixorawebmob

Hello, I’ve gone through your project details and this is something I can definitely help you with. With over 10 years of experience in mobile app development, I specialize in Flutter, REST API integrations, and WebSocket implementations. My strong background in JavaScript makes me well-equipped to manage code injections and dynamic content in WebView efficiently. I focus on clean and scalable coding practices, ensuring that the project runs smoothly from start to finish. I will review your requirements thoroughly, suggest the best technical approach, and maintain clear communication throughout the development process. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: 1. Do you have specific performance metrics you’re looking to achieve? Do you have specific performance metrics you’re looking to achieve? Let’s discuss over chat! Regards, Arpit Jaiswal

@tobiask5

Hi there, I hope you are doing well, I’d be excited to support your Flutter project, focusing on advanced WebView and real-time communication features. I have extensive experience injecting and managing JavaScript inside Flutter WebViews, enabling two-way communication between Flutter and JS, integrating REST APIs, and implementing WebSocket and WebRTC for live interactions. I follow clean, scalable coding practices and can optimize performance while debugging complex WebView behaviors. My goal will be to ensure smooth real-time functionality, reliable JS execution, and maintainable code for your application. Best regards, Tobias

@Cmonosoft

Hello, I have reviewed your requirement & Yes I can work on your Flutter project with heavy WebView usage including custom JavaScript injection and two-way communication between Flutter and JS. I have experience handling REST APIs, WebSocket real-time features and WebRTC live communication inside Flutter apps. I can manage JS channels, callbacks, dynamic content control and debugging inside mobile WebView. I follow clean scalable coding and optimize performance for stable real-time behavior. I am comfortable with complex WebView apps and real-time socket integrations. Let's connect to discuss further. Regards Saurabh S.

@shivam981994

Hi, I am very interested in assisting with your Flutter project, especially given its advanced WebView, JavaScript, WebSocket, and WebRTC requirements. I have strong experience working with Flutter WebView integrations, including: • Injecting and executing custom JavaScript inside WebView • Setting up JavaScript channels for two-way communication • Managing callbacks between Flutter and JS • Dynamically controlling web content from Flutter • Handling complex state synchronization between native and web layers In addition, I have hands-on experience with: • REST API integrations with proper error handling • WebSocket implementation for real-time features • WebRTC integration for live communication (audio/video signaling flow understanding) • Debugging JavaScript inside mobile WebView environments • Performance optimization for hybrid Flutter applications I understand the complexity of managing Flutter ↔ JavaScript communication while keeping the architecture clean and scalable. My focus is always on structured code, stability, and long-term maintainability. If needed, I can first review your current implementation and provide a clear technical improvement plan before proceeding with development. I look forward to discussing your project in detail. Best regards, Shivam

@DigitalNightOwl8

Hi , Good afternoon! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in HTML5, API Integration, Mobile App Development, Flutter, WebRTC, REST API, JavaScript, Dart, jQuery / Prototype and PHP. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Your Sincerely

@mayankinnovative

Hi, As per my understanding: You have a Flutter application heavily dependent on WebView, where custom JavaScript is injected and controlled dynamically. The system requires stable two-way communication between Flutter and JS, real-time updates via WebSocket, WebRTC for live communication, and strong handling of API integrations. Performance, scalability, and clean architecture are critical. Implementation approach: • Review existing Flutter-WebView structure and optimize JS injection using JavaScript channels, postMessage bridges, and controlled lifecycle hooks. • Build a structured communication layer for reliable two-way messaging (Flutter ↔ JS) with error handling and callback management. • Integrate REST APIs and WebSocket for real-time sync with reconnection logic and state management. • Implement WebRTC with proper signaling flow and media stream handling inside WebView. • Debug and profile JS execution within WebView to prevent memory leaks and performance bottlenecks. • Ensure modular, maintainable code architecture for future scalability. A few quick questions: Are you using webview_flutter or a custom WebView package? Is WebRTC handled natively or fully inside WebView? Target platforms: Android only or iOS as well? I will share relevant Flutter WebView and real-time project experience in my first message. Confident I can stabilize and optimize your WebView-driven architecture.

@Rupal878

I have solid experience integrating REST APIs, WebSockets for real-time updates, and handling advanced JavaScript execution inside Flutter WebView using JavaScript channels, injected scripts, and structured callbacks. I understand how to maintain clean communication bridges between Flutter and JS while keeping performance stable. WebRTC implementation for live communication, signaling flow, and media handling can also be structured properly within your Flutter architecture. Is your WebRTC signaling server already implemented? Are you using webview_flutter or another WebView package? Is the project targeting Android, iOS, or also Flutter Web? Portfolio: https://www.freelancer.in/u/Rupal878 Rupal Saini Looking forward to hearing back from you and discussing this in the chat.

@arshig8

Hello, With my expansive skill set and experience, I am confident that I'm the right person for your Flutter project. Over the years, I've honed my capabilities in API integration, including deep knowledge in REST APIs, WebSockets, as well as WebRTC - all of which are extensively relevant to your needs. Moreover, having interacted with JavaScript both outside and inside Flutter WebView, I understand how to write clean and scalable code for injecting scripts into web views. In terms of core competencies, my proficiency with Flutter (UI/UX), HTML/CSS and Mobile App Development complements well with the specific skills you seek. My constant commitment to a clean and robust coding practice ensures that our apps are fast, optimized, and performant. This translates to seamless experiences for you and your users. Lastly, it's worth mentioning my experience in handling complex WebView-based applications and debugging JS inside mobile WebView. Building an application like yours requires a solid understanding of what lies beneath the surface, and I have proven that I am capable of navigating these complexities effectively. In all endeavors , my aim is simple: to make your project work as flawlessly as you envision it to be. Thanks, Arshiya