Business App, Website & Billing System

@sgrocean37

Hello, I will develop your cross-platform business communication platform including Apps (iOS / Android / Web – Single Codebase) • Real-time messaging & group channels • Voice & video calling integration • Shared user authentication across all platforms • Seamless device switching without data loss Website & Admin Layer • Marketing website aligned with app branding • Admin dashboard with user & activity management • Unified authentication & database Billing System • Subscription & one-time payments (Stripe or equivalent) • Tax calculation & invoicing • Webhook-based recurring billing automation • Downloadable statements Architecture • Flutter / React Native + scalable backend (Node/Laravel/Django) • Centralized user database • Secure, production-ready deployment Delivery includes tested builds (TestFlight/internal), deployed website, end-to-end billing validation, full source code & handoff documentation. Let’s chat.. Thanks, Sagar P.

@vishal1145

Your biggest risk here isn't the tech stack - it's the real-time infrastructure collapsing under concurrent video calls while billing webhooks fail silently in the background. I've seen three projects like this burn through $80K before realizing their messaging layer couldn't handle 50 simultaneous connections and their payment reconciliation had a 3-day lag. Before architecting this, I need clarity on two things: What's your expected concurrent user load in month one versus month six? And does your billing model require usage-based metering (like per-minute call charges) or just flat subscription tiers? The answer changes whether we use WebRTC with a media server or peer-to-peer, and whether Stripe's standard webhooks are sufficient or you need custom event tracking. Here's the architectural approach: - FLUTTER + DART: Single codebase deploying to iOS, Android, and Web with Firebase Cloud Messaging for push notifications and offline message queuing to prevent data loss during network drops. - PHP + LARAVEL: Build a RESTful API with Laravel Sanctum for token-based auth, ensuring the same session works across mobile apps and web dashboard without forcing re-login. - STRIPE PAYMENT GATEWAY: Implement subscription lifecycle hooks (trial_end, payment_failed, subscription_canceled) with idempotency keys and a retry queue so failed payments don't silently disappear from your records. - WEBRTC + AGORA SDK: Handle voice/video calls with fallback to TURN servers when users are behind restrictive firewalls - this prevents the "call connected but no audio" issue that kills 30% of sessions. - POSTGRESQL + REDIS: Store user data in Postgres with indexed queries on subscription status, cache active sessions in Redis to keep dashboard load times under 300ms at 10K users. I've built two SaaS platforms with similar real-time + billing requirements that scaled from beta to 15K paying users without infrastructure rewrites. The difference between a $50K build and a $150K rebuild six months later is getting the event-driven architecture right from day one. Let's schedule a 20-minute technical call to walk through failure scenarios - specifically what happens when a payment webhook arrives during a server deployment or a user upgrades mid-call.

@muskaannadaf

Hi there! I'm Asma, a web developer and graphic designer with 10 years of hands-on experience helping brands stand out in crowded markets. I've worked with clients and agencies across fashion, hospitality, property, and luxury lifestyle sectors, and one thing stays constant: I'm obsessed with getting the details right. I don't just make things look pretty. I solve problems. Whether it's a logo that captures your brand's soul, a website that loads lightning fast , or a complete visual identity from business cards to social media assets, every element I create is intentional and built to convert. My toolkit spans the full creative spectrum: WordPress, Shopify, HTML/CSS/JS, PHP, Laravel, Figma, Photoshop, and Illustrator. I'm equally comfortable translating a PSD or Figma file into clean, functional code as I am designing from scratch. What you can expect working with me: fast responses, clear communication, and a genuine investment in making your project shine. I treat every client's vision like it's my own. I'd love to learn more about what you're looking for. Let's create something remarkable together. Looking forward to hearing from you!

@abhishek060

Hi, I can build your cross-platform app, web portal, and billing system using a single scalable stack with real-time messaging, calls, and unified authentication. I’ll deliver production-ready builds, secure Stripe billing integration, and a clean admin dashboard with full hand-off and deployment support. Can we discuss on chat. Regards Abhishek

@santoshkumars17

As an experienced Full-Stack Web and App developer, I feel confident that I can meet your needs for a seamless and highly functional, multi-platform business app. With my extensive experience in both front-end and backend development (using popular frameworks like React.js and Node.js) as well as my ability to work with different tech stacks like Flutter or React Native, I promise to deliver a high-quality application that can run on numerous devices without any loss of context. My expertise in payment gateway integration, specifically working with Stripe or any other local alternative, will ensure that your billing system is not only capable of handling subscriptions and tax calculations but is also reliable and secure. I’ve built e-commerce platforms before, so I understand the importance of maintaining accurate records and generating downloadable statements. Lastly, I’d like to highlight my strong emphasis on clean coding practices and performance optimization, which aligns perfectly with your need for maintainable code and a reliable system. Not only will your final product be tested and production-ready but I’ll also provide comprehensive documentation to make the transition smooth for you. Let's discuss your project in detail so we can create magic together!

@shabahathabib

Hello,I can build your cross-platform business app with a single codebase (Flutter or React Native), delivering real-time messaging, voice/video, group channels, and a unified auth system across iOS, Android, and Web. The companion marketing site and admin dashboard will connect to the same backend, with Stripe-powered subscriptions and invoicing fully integrated. I focus on scalable architecture, clean API design, and smooth device-to-device continuity. Milestone-based delivery, full documentation, and deployment support included. Ready to discuss the best stack and start immediately. BEST REGARDS SHABAHAT HABIB*

@Ak230598

Hello, I CAN DO THIS. I have 6.5+ years of experience in this field. Let's connect and discuss more about your requirements. Thank you.

@Kishoreindia

Dear Sir/Madam, I am Kishore Patidar, a professional Mobile App and Python Developer with strong experience in building scalable, production-ready mobile applications and backend systems. I specialize in Flutter (cross-platform), Android (Java/Kotlin), Firebase, Supabase, Node.js, FastAPI, and Django. I have successfully delivered multiple live apps on both Google Play Store and Apple App Store, including fintech, healthcare, education, social networking, and on-demand service platforms. My expertise includes: * Cross-platform mobile app development (Flutter) * Backend API development (Node.js, FastAPI, Django) * Payment Gateway integration (PhonePe, Razorpay, Stripe) * Real-time chat & notification systems * Admin panel & dashboard development * App deployment & store publishing * Secure authentication & role-based systems I focus on clean architecture, scalable backend design, optimized performance, and smooth user experience. From idea to deployment, I can handle complete end-to-end development. I would be happy to discuss your project requirements and deliver a reliable, high-quality solution within timeline. Looking forward to working with you. Best Regards, Kishore Patidar Mobile App / Python Developer

@Ussama91

I plan to develop a full-stack commercial app with real-time messaging, voice/video calls, and group channels, along with a companion marketing website and integrated billing system, using a flexible tech stack such as Flutter, React Native, or native/hybrid approach, with a shared user database and authentication flow, and meeting the acceptance criteria of tested builds, production-ready website, and billing module. Waiting for your response in chat! Best Regards.

@bhartimalu

Hello, I can develop your Business App Website with integrated Billing System, including client management, invoice generation, payment tracking, reports, and a clean responsive dashboard. I have strong experience building custom web-based business systems with secure backend, role-based access, and scalable architecture. Ready to start immediately. Regards, Bharti M

@techstar12

What are your thoughts on using Flutter for your cross-platform app? I believe it could streamline development, especially with real-time messaging, voice/video calls, and a shared user database. I have extensive experience building multi-platform business apps and have shipped solutions with similar functionalities. Integrating a billing system with subscriptions and invoices is also within my expertise. I’ll ensure a smooth user experience across the app and companion website, while maintaining a reliable backend. I propose we have a quick call to discuss your core requirements and the technologies you prefer. I will craft a detailed timeline and approach to meet your needs. Looking forward to collaborating!

@Videoeditior

Hi, I read project description ( )and I can COMPLETE this project with quality and your satisfaction. My Key points(Android and iOS): 1. AutoLayout and XML design 2. API Integration 3. Social Integration 4. Payment gateway Integration 5. Firebase Chatting 6. Notification 7. Map Integration etc. Please visit my portfolio to check other client's feedback here - https://www.freelancer.in/u/Videoeditior I am waiting for your very valuable reply so I can full feel your idea in good way. Thank you. Akshay

@QuickMentor

Business App, Website & Billing System I'm excited after reviewing your project details! With over 5 years of hands-on experience in Web and App Development, I specialize in building high-performing, user-friendly, and fully responsive digital solutions tailored to your business needs. I hold an academic background in Computer Science and have successfully delivered numerous projects across various industries. My expertise includes: Custom Website Development (React, Angular, Laravel, PHP, WordPress, etc.) Mobile App Development (iOS, Android, Flutter, React Native) E-commerce & CMS Solutions (Shopify, WooCommerce, Magento) API Integration & Backend Development UI/UX Design & Prototyping Bug Fixing, Speed Optimization & Maintenance ✔ Clean, Scalable & Secure Code ✔ 100% Mobile & SEO-Friendly ✔ Ongoing Support & Unlimited Revisions Let’s turn your idea into a powerful digital product that exceeds expectations! Check my profile: https://www.freelancer.com/u/QuickMentor Looking forward to working with you!

@Hemantt841

I understand you require a cross-platform business app with seamless communication features, including real-time messaging, voice/video calls, and group channels, alongside a marketing website and integrated billing system sharing a unified user database. Your focus on a single code-base for iOS, Android, and web to ensure smooth device switching is clear and important. With over 15 years of experience and more than 200 projects completed, I specialize in full stack development using PHP and Laravel for backend systems, alongside Flutter for mobile app development. I have built scalable apps connecting mobile and web platforms with payment gateway integrations like Stripe, ensuring secure subscription management and invoicing. For your project, I propose using Flutter to maintain a single codebase for mobile and web, backed by a Laravel API for authentication, billing, and admin dashboard. This will streamline the user experience and simplify maintenance. I estimate delivering tested builds on TestFlight and internal tracks, a production-ready website, and a fully functional billing module within 12 weeks, including thorough end-to-end testing. I’d be happy to discuss your priorities and timeline in more detail to tailor the approach to your needs.

@Himanshu123gupta

I thoroughly understand that you're looking to create a multi-platform business app that focuses on seamless communication, and I'm well-equipped with the necessary skills to execute this project successfully. Being a seasoned full-stack developer, I have comprehensive expertise in Mobile App Development- especially in Flutter, Custom Theme Development, and WordPress Plugin Development. Furthermore, my 8 years of experience have allowed me to lead teams and deliver high-quality applications and websites for businesses across various sectors. This has granted me a deep understanding of managing different layers-and-functions, services that your project demands. This will allow me to develop customized yet reliable and maintainable solutions for your cross-platform business app. In addition to these, I also bring with me a complementary skillset of working with PHP-based Laravel that might align well with your backend requirements. My prior experience in handling subscription models and tax calculations makes me comfortable and capable to create an integrated billing system for your project. I’ll ensure the frameworks I choose will result in a user-friendly experience while upholding your specific requirements. Overall, I firmly believe that my technical competencies combined with a diligent work ethic can deliver satisfactory results for your project. Let's discuss your vision further!

@khushiArt

Hello, Hope you are doing well. I have experience of 6+ years of in Mobile Applications Development and I have previously made many applications with Interactive Designs and Functionalities. I have reviewed your requirement. I will definitely design & develop a fully responsive & user-friendly application. However, I would like to dig more into your requirements to develop a unique application as per your desires App development:- Olx App Taxi App Dating App. Educational App Multivendor App. Hotel and Restaurant Booking App. Doctors/ hospital management App. Please have a look at my portfolio link : https://www.freelancer.com/u/khushiArt Best Regards Khushbu

@InWebTechno

Hello, I'm Raj from Inweb Technologies, with over 10 years of experience in PHP. I understand your need for a comprehensive business app, website, and billing system. I specialize in creating optimized websites and executing effective marketing campaigns to drive leads and sales. I am confident in my ability to deliver a seamless communication platform across iOS, Android, and the web, integrated with a robust billing system. I would like to discuss your project further to provide a tailored solution. Let's connect in chat to explore your requirements in detail. Best regards, Raj

@TeamGTW

Hello! I understand you need a full-stack, cross-platform business app with real-time messaging, voice/video calls, group channels, a responsive web portal, and an integrated billing system all tied to a single authentication flow so users can switch devices seamlessly. With 7 years of experience building multi-platform business apps, I can deliver a reliable, maintainable solution using Flutter or React Native for the apps and Node or Django for the backend. Your billing system will handle subscriptions, one-off invoices, taxes, and downloadable statements, fully tested end-to-end. The web portal will mirror your app’s brand, provide an admin dashboard, and support smooth user onboarding. I specialize in creating apps where reliability, cross-device sync, and seamless user experience are critical. Clean architecture, careful testing, and secure integration of payment gateways will ensure your platform works flawlessly from day one. I ALSO OFFER THREE MONTHS OF SUPPORT AFTER DELIVERY TO ENSURE EVERYTHING RUNS SMOOTHLY, AND I’D BE HAPPY TO SHARE PAST PROJECT EXAMPLES IN A PRIVATE CHAT. Let’s connect to discuss the project so your platform is delivered as a polished, fully integrated, and reliable solution. Best regards, nikita gupta

@Yunsoft

Hi , I just saw your project regarding Business App, Website & Billing System. I've been building scalable web apps and custom integrations for a while, and this fits right into my wheelhouse. I'm a full-stack developer with hands-on experience in AI (custom LLMs, RAG, workflow automation), SaaS architectures (React, Node.js), and Web3 integrations. Instead of just delivering basic scripts, I focus on building secure, production-ready solutions that actually scale. I've launched multiple real-world products and know how to avoid the common technical pitfalls in these areas. Let's hop on a quick chat so we can go over your exact needs. I can share some of my recent work so you can see the code quality firsthand. Thanks, Emre