Cross-Platform Mobile App Development

@infowider11

✔️ Senior Cross-Platform AI Collaboration App Developer Hello, How are you? I checked your Jd and you are looking to build a cross-platform (iOS & Android) Claude Cowork-style application focused on secure user access, real-time communication, and an integrated Agentic AI assistant. This is essentially a productivity + AI collaboration system where users can sign in securely, communicate through in-app messaging, and interact with an AI agent that supports task execution, assistance, and workflow automation. From a technical perspective, this requires a scalable mobile architecture (Flutter or React Native), secure authentication (JWT/OAuth), real-time messaging (WebSockets/Firebase), and AI integration using streaming APIs for responsive agent interaction. Let’s chat… Thanks

@irsolutions

With over a decade of experience in full-stack architecture and high-scale systems, I understand your need for a skilled mobile app developer to create a cross-platform application for iOS and Android with user registration, in-app messaging, and an Agentic AI application. My background in scaling apps to serve over 1 million users and expertise in secure authentication make me well-suited for this project. To ensure scalability and security, I recommend implementing token-based authentication for user login and utilizing cloud-based messaging services for in-app communication. I have successfully developed and scaled Telegram Mini Apps serving over 1 million users, showcasing my ability to handle complex projects like yours. I encourage you to reach out to discuss your project roadmap further and see how we can collaborate to bring your vision to life.

@diektech

Hi, This is Elias from Miami. I checked your project description and understand you’re looking to create a cross-platform mobile application for Claude Cowork. The goal is to develop an app that will provide a seamless experience for users on both iOS and Android. I have a solid background in mobile app development, having worked on several similar projects that required strong UI/UX design and performance optimization. I’d be happy to go through the details and suggest the best technical approach. To ensure I fully understand your needs, I have a few questions for clarification: Q1 – What specific features do you envision for the app? Q2 – Do you have any existing systems or APIs that the app needs to integrate with? Q3 – What user roles do you expect, and how will authentication be managed? Looking forward to hearing from you.

@technosystem

Drawing from my extensive experience in both mobile app development and full-stack web development, I am confident that I can deliver a top-tier cross-platform app that meets your precise needs. I've built numerous mobile apps, including ones involving secure authentication and marketplaces, keys skills you're seeking for this project. To further affirm my ability to handle this task, a prominent feature of one of the apps I've worked on is an Agentic AI integration system similar to what you are looking for. This would undoubtedly save us time and avoid potential pitfalls during the development process. Moreover, employing my React Native expertise, I have developed sleek and intuitive user interfaces (UI) for previous projects, making navigation seamless and user engagement optimized. Implementing robust yet user-friendly registration and login functionalities has also become second nature to me. Additionally, as someone who has built several in-app messaging systems before, I am well-versed in ensuring seamless communication between users within platforms - a feature we must get right on your Claud Cowork app.

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in Mobile App Development, iPhone, Android, User Interface / IA, Agile Development, iOS Development, Mobile Development, User Experience Research and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@planDapps

Hi, Building an "Agentic AI" coworker requires more than just a chat interface it needs a robust Software Architecture that allows the AI to execute tasks, not just respond to prompts. At Plan D Studios, we bring 12+ years of experience in Mobile App Development, specializing in Flutter to deliver high performance, cross-platform applications with deep AI integrations. My Execution Strategy: Agentic AI Integration: We’ll build a "Function Calling" layer between the app and the AI (Claude/GPT), allowing the agent to interact with your In App Messaging and user data to perform real work. Secure Authentication: Implementation of industry standard OAuth2/OpenID protocols to ensure user data remains protected. Real Time Messaging: Using WebSockets or Firebase for a lag free, scalable communication system. Agile Development: We work in bi weekly sprints, providing you with a functional build at every milestone for feedback. We handle all iOS Development and Android deployment in-house. Regarding the Agentic AI: Will the agent primarily handle internal app tasks (like scheduling and data retrieval), or will it need to connect to external third party APIs to complete its workflows? Regards, Haider

@kamran2012

I can help with this, I will build your cross-platform app in Flutter — auth, in-app messaging, and the Agentic AI module — deployed to both iOS and Android from a single codebase. For the AI agent, I will structure it with a task-planning layer that breaks user requests into steps and executes them autonomously, rather than simple prompt-response. This makes the agent far more useful in real workflows. Questions: 1) Which AI model will power the agent — Claude, GPT, or another? 2) Do you have a backend preference for auth and messaging? Send me a message and we can go over the details. Best regards, Kamran

@mobiappsoftware

Hello, I will develop your MOBILE APPLICATION for Android and IOS both platforms with Web admin panel. I am Tulsiram. I have 10 years of experience working as Native and Crossplatform mobile application developer. I am understood your requirements. I am glad if we are working together. If you interested then let's connect. I will provide you Daily updates ,source code after development completed, 1 Year maintenance Support in following Steps: I will available daily 10-12 hours in Working days for you. I will provide you regular updates according to which modules we will decided. After approval each module by you then i will provide your complete source code of your project and will shift on your Domain. Thanks

@ciss26

Hello, I hope you are doing well. I understand that you are looking to build a MOBILE APPLICATION, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.

@DeveloperStation

Hi, We’ve developed several mobile apps with in-app messaging and user authentication, including a product that uses AI to enhance user experience. We also have a dedicated UI/UX designer to ensure your app is intuitive and user-friendly. For your project, we can use either Flutter or React Native, depending on which framework is better suited for your specific requirements. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. Feel free to message me anytime—I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil

@Eliteinno

Hi, my team and I just reviewed your Claude Cowork app project. Our devs see the need to Architect a robust backend to Scale with both iOS and Android platforms efficiently. Our design leads ensure user registration and in-app messaging are seamless, while our AI specialists will integrate the Agentic AI application smoothly. We've previously delivered a large-scale mobile app using React Native that handled over 100,000 active users daily while integrating a complex AI module. Our stack expertly managed user data and maintained high security, similar to your current needs. I'll be your direct technical point of contact, and we'll set up a staging environment for you to test features before launch. What's your long-term vision for the AI component within the app? Let's explore how we can bring your vision to life.

@kishanbwts

I’ve built cross-platform apps with secure user login and messaging before, including one for a coworking space that integrated AI-driven features. For your Claude Cowork app, I’d start by setting up secure registration/login using OAuth or JWT to keep user data safe on both iOS and Android. Then I’d implement real-time messaging—either with Firebase or a similar back-end to ensure smooth delivery and notifications. For the Agentic AI part, what specific AI capabilities do you want—like chat, recommendations, or task automation? Knowing this helps pick the best integration approach. A rough timeline would be 6-8 weeks, allowing time for backend setup, front-end UI design, and thorough testing on both platforms. Could you share if you have existing APIs or want me to build those as well? Ready to get started and bring this app to life with clean, maintainable code.

@trlm0102

Hi — I’m Aminuzzaman. I can architect and build Claude Cowork, delivering a high-performance cross-platform ecosystem that seamlessly integrates secure communication with advanced Agentic AI capabilities. 1. Technical Architecture & Strategy Cross-Platform Performance: I recommend using Flutter. It allows us to build a single, high-fidelity codebase that feels native on both iOS and Android. My focus is on "zero-jank" UI, ensuring that complex AI interactions and messaging transitions are buttery smooth. Agentic AI Integration: I will build a sophisticated middleware layer (Node.js or Python) that interfaces with LLM providers (like Claude 3.5 Sonnet). This agent will be designed to handle multi-step reasoning, tool-calling (APIs/Search), and autonomous task execution based on user prompts. In-App Messaging & Auth: I’ll implement a low-latency messaging engine using Firebase Realtime Database or Supabase. For authentication, I’ll use secure protocols (OAuth 2.0 / OpenID Connect) with support for Apple and Google Sign-In. Agentic Logic Flow: I'll implement the AI as a stateful agent, allowing it to remember context across conversations and proactively suggest actions, transforming it from a simple chatbot into a true "Coworker."

@mahig47

Hello! As per your project post, you’re looking to build a cross-platform mobile application for “Claude Cowork” that includes secure user authentication, in-app messaging, and an Agentic AI system, all wrapped in a smooth and intuitive user experience for both iOS and Android. The goal is to create a scalable, modern app that not only handles real-time communication but also integrates intelligent AI-driven functionality. My focus will be on delivering a complete cross-platform solution, featuring: development using a robust framework like Flutter or React Native for a single scalable codebase; secure authentication (JWT/OAuth-based) with proper session management and data protection; a real-time in-app messaging system using technologies like WebSockets or Firebase for instant and reliable communication; and integration of an Agentic AI layer capable of handling contextual tasks, smart suggestions, and automated workflows based on user behavior and inputs. I specialize in building cross-platform apps with real-time systems and AI integrations, focusing on clean architecture, performance optimization, and seamless user experience. My experience includes developing apps with authentication systems, messaging features, and AI-driven functionalities, ensuring both reliability and long-term scalability. Let’s connect to review your AI vision, user flows, and feature priorities so we can define a clear MVP scope, timeline, and execution strategy. Best regards, Nikita Gupta

@mascotindia123

Hi, I can develop your cross-platform Claude Cowork mobile app for both iOS and Android using React Native or Flutter, depending on your preference for performance and scalability. The app will include secure authentication (registration/login with proper token handling), a clean and intuitive UI/UX, and a structured backend architecture designed for future scaling. I can implement a real-time in-app messaging system using WebSockets or Firebase, ensuring smooth and reliable user communication. For the Agentic AI component, I can integrate an LLM-powered system (such as Claude/OpenAI APIs) with tool-based workflows to enable intelligent, task-driven behavior inside the app. The architecture will be modular, allowing easy expansion of AI features, chat systems, and future integrations without major refactoring. I have experience building cross-platform apps with API integrations, real-time features, and AI-powered modules, focusing on clean code and production-ready performance. Warm regards, Harpreet Singh

@mogsten

Hi there, I reviewed your project about building a Claude Cowork cross-platform mobile app for iOS and Android with secure authentication, in-app messaging, and an Agentic AI experience. My approach: • Build the app in a cross-platform framework such as React Native or Flutter so both iOS and Android stay aligned and easier to maintain. • Implement secure user registration and login with a clean auth flow, session handling, and protected API access. • Develop the in-app messaging feature with reliable real-time or near-real-time communication depending on your preferred architecture. • Integrate the Agentic AI layer in a practical way so it works smoothly within the mobile product and supports future expansion. • Keep the UI clean, intuitive, and production-focused so the app is usable from the first release. You will receive a working cross-platform mobile app with authentication, messaging, and AI integration, built with a scalable structure for future features and updates. Do you already have the backend and AI workflow defined, or would you like help shaping the full architecture as part of the project? Cheers, Alexander

@CANWS

Hi, I can build your Claude Cowork cross-platform app for both iOS and Android using Flutter or React Native, with a clean scalable architecture. ✅ Secure user registration/login ✅ Real-time in-app messaging ✅ Agentic AI integration (Claude/OpenAI/custom workflows) ✅ Smooth, user-friendly UI/UX ✅ Single codebase for faster launch on both platforms I’ve worked on mobile apps with chat systems, authentication, and AI-powered features. ✔️Timeline 4–6 weeks depending on AI workflow scope. ✔️Budget Can finalize after feature depth, but I’m open to milestone-based delivery. Do you already have wireframes for Claude Cowork, or should I also help shape the app flow/UI?

@abhishek060

Hi, This sounds like a Claude-style AI coworking app with messaging and Agentic AI capabilities. I have experience building AI-powered cross-platform apps and can develop this for both iOS and Android. I can build: • Cross-platform app (Flutter or React Native) • Secure user registration & login • Real-time in-app messaging • Agentic AI integration (Claude/OpenAI style workflows) • Clean, user-friendly UI/UX • Push notifications & performance optimization Tech Stack: Flutter / React Native + Node.js / Firebase + AI API integration Timeline: 4–6 weeks (depending on AI scope) Includes: Full source code + deployment support I can start immediately and help you build a scalable AI coworking platform. Regards, Abhishek

@ZohaibRoy

⭐⭐⭐⭐⭐ Create a Cross-Platform Mobile App for iOS and Android ❇️ Hi My Friend, I hope you are doing well. I just checked all of your project requirements and I can see you are looking for a mobile app developer. You have no need to look any further as Zohaib is here to help you! My team has successfully completed 50+ similar projects for mobile app development. I will create a user-friendly app featuring secure registration, in-app messaging, and an Agentic AI application, all within your budget. ➡️ Why Me? I can easily build your cross-platform mobile app as I have 5 years of experience in mobile app development using React Native and Flutter. My expertise includes secure user authentication, in-app messaging systems, and AI integration. Not only this, but I also have a strong grip on UI/UX design, ensuring a smooth user experience. ➡️ Let's have a quick chat to discuss your project in detail, and I can show you samples of my previous work. Looking forward to discussing this with you in chat. ➡️ Skills & Experience: ✅ Mobile App Development ✅ React Native ✅ Flutter ✅ User Authentication ✅ In-App Messaging ✅ AI Integration ✅ UI/UX Design ✅ Cross-Platform Compatibility ✅ Secure Coding Practices ✅ Debugging and Testing ✅ Agile Development ✅ Project Management Waiting for your response! Best Regards, Zohaib