Universal Sing-Box VPN App Suite

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in Android, Flutter, Mobile App Development, iPhone As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@corpmember29

Hello, Universal Sing-Box VPN App {{{ I HAVE 10+ YEARS OF EXPERIENCE IN FLUTTER, CROSS-PLATFORM APP DEVELOPMENT, API INTEGRATION AND NATIVE PLATFORM INTEGRATION, AND I HAVE WORKED ON SIMILAR NETWORKING/VPN CLIENT PROJECTS BEFORE AND CAN SHOW YOU }}} I read your requirements carefully and understand that you need one maintainable codebase for Android, iOS, Windows, macOS and Linux, with minimal platform-specific code. I can build the Flutter client around your existing sing-box infrastructure, including authentication, node selection, connect/disconnect, logs, real-time usage, subscription status, remote feature flags and announcements. I will keep the UI, backend/data layer and sing-box bindings clearly separated with clean architecture and null-safe code. I will also handle platform-specific integration where required and prepare CI/CD workflows for generating signed builds across the target platforms. Usage reporting will be implemented and validated against your server-side statistics, including the required accuracy target. Deliverables will include complete source code, build/deployment documentation and a short working demo. We will work with Agile methodology, and I will provide 2 years of free ongoing support. I eagerly await your positive response. Thanks

@C0RETECHIES

Hi, You need a cross-platform GUI for your sing-box VPN infrastructure. The system must bridge a shared Flutter frontend with underlying sing-box binaries across 5 OS targets, handling token lifecycles, precise telemetry, and remote flags without app restarts. Technical approach: - Utilize Flutter with Dart FFI to bind and execute sing-box shared libraries natively. - Implement Clean Architecture with Riverpod to reactively manage remote feature flags. - Build a core API repository for token auth, subscriptions, and JSON feed parsing. - Configure a GitHub Actions matrix for multi-platform signed artifacts (APK, IPA, EXE, DMG). Core modules: - Transport Wrapper: Sing-box lifecycle control (connect, node selection, log tailing). - Telemetry: Usage polling calibrated to match server metrics within the 1% tolerance. - Dynamic States: Live feature flag injection and seamless subscription expiry flows. Relevant systems: - SecureCom - Cross-platform encrypted communication suite handling complex transport protocols. - CoreWipe - System-level app executing low-level native operational protocols. Implementation strategy: - Set up Dart FFI to validate sing-box execution hooks on mobile. - Build UI layer and integrate API endpoints for auth and data. - Expand to macOS/Windows/Linux, minimizing platform-specific glue. - Finalize CI pipeline for automated build releases. 1. Will you provide pre-compiled sing-box libraries, or should CI compile them from Go source? 2. Does the backend stream usage data via WebSockets, or should the client poll an endpoint? 3. Are code signing certificates ready for the GitHub Actions pipeline? Regards, Rohit

@shrec

Hi, I can help build the cross-platform client around your existing sing-box infrastructure, with Flutter as the shared application layer and minimal platform-specific code. The key would be keeping the architecture clean between the UI, backend/API layer, and sing-box bindings. I’d cover token authentication, node selection, connect/disconnect, logs, real-time usage, subscription status, remote feature flags, and JSON announcements across Android, iOS, Windows, macOS, and Linux. I’d also structure the project so platform builds remain reproducible from one repository, with GitHub Actions handling build automation and signed releases. The acceptance criteria around usage accuracy, subscription expiry, and live flag updates would be tested explicitly rather than treated as secondary details. I’d be glad to review the sing-box hooks and UI direction and map out the implementation. Best, Ivane

@bcosley

Hi, I’ve built cross-platform clients that wrap native binaries with a shared codebase, so auth, real-time stats, and remote flags feel native on Android, iOS, Windows, and macOS. I’d start by validating the sing-box hooks against your backend endpoints, then implement a lean data layer and a single UI shell that compiles everywhere, with minimal platform glue and clear UI/data separation. One technical risk / key challenge: keeping real-time usage in sync with the server within 1% across all platforms can be tricky without a robust delta-validation path. Two clarification questions: - Should remote feature flags be per-user or global, and how should the UI reflect rollout states? - What should happen if the device goes offline and reconnects, should usage stats reconcile or reset? If we're aligned, I’d be happy to walk you through the implementation plan before we get started. Best regards, Brandon

@CodeAnchors

Greetings, I understand the need for a polished, cross-platform Universal Sing-Box VPN App Suite to enhance your existing infrastructure. With expertise in Mobile App Development, Android, iOS, Flutter, and VPN technologies, I am well-equipped to deliver a native-feeling app suite for multiple platforms. My approach includes structured requirement confirmation, controlled planning, clean implementation, testing checkpoints, and milestone-based transparency to ensure a successful project execution. My portfolio showcases successful projects in Mobile App Development, Android, and Flutter, demonstrating a track record of reliable execution and long-term results. To better understand your priorities, could you share more insights on your key business goals for this project? I invite you to open a chat to finalize the project scope smoothly. I look forward to discussing the sing-box hooks and UI mock-ups to kickstart this exciting challenge. Best regards, Muhammad Anas Khan

@Eliteinno

Hi there, Building a cross-platform app that feels native on all devices can be challenging, especially when integrating with existing systems for seamless user authentication and data management. The key is a clean, singular codebase that simplifies deploying and maintaining the app across platforms. I have extensive experience in developing such applications, ensuring robust performance and alignment with your brand identity. Here are my questions to ensure we're aligned on your needs: First, do you have any specific UI/UX design guidelines or mock-ups ready for the custom GUI? Second, are there any particular experimental protocols you anticipate needing to toggle frequently? Let's discuss your project now!

@ZohaibRoy

⭐⭐⭐⭐⭐ Create a Cross-Platform Client for Your Sing-Box VPN Infrastructure ❇️ Hi My Friend, I hope you're doing well. I reviewed your project requirements and see you are looking for a cross-platform client for your sing-box VPN. Look no further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for VPN applications. I will build a polished and modern client that meets your needs, ensuring seamless integration with your existing backend. ➡️ Why Me? I can easily create your cross-platform client as I have 5 years of experience in mobile and desktop app development. My expertise includes Flutter, UI/UX design, and backend integration. Not only this, I have a strong grip on other relevant technologies like GitHub Actions, ensuring a smooth workflow for your project. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I'm excited to demonstrate how I can add value to your project! ➡️ Skills & Experience: ✅ Flutter Development ✅ Mobile App Development ✅ Cross-Platform Solutions ✅ UI/UX Design ✅ Backend Integration ✅ GitHub Actions ✅ Real-Time Data Handling ✅ API Development ✅ User Authentication ✅ CI/CD Implementation ✅ Code Optimization ✅ Clean Architecture Waiting for your response! Best Regards, Zohaib

@cliftonc20

Hi, Your existing sing-box VPN infrastructure with token-based authentication and real-time usage tracking presents a solid foundation for a unified cross-platform client. The main technical risk is ensuring consistent and accurate usage reporting across diverse OS environments while maintaining a clean separation between UI, data, and sing-box bindings. I led the architecture for the Enterprise ProxyTool Client App, which involved cross-platform desktop clients tightly integrated with OS networking stacks and backend systems for usage metering and subscription management. Additionally, my work on Dent-Cloud involved real-time analytics and subscription workflows that parallel your backend integration needs. I typically design systems by separating the transport layer bindings from the UI and data layers, enabling independent testing and platform-specific optimizations while sharing core logic. Early validation would focus on usage data synchronization accuracy and the remote feature flag update mechanism. To ensure reliability, I emphasize monitoring, fallback strategies, and incremental update mechanisms that avoid app restarts and minimize user disruption. I can start by outlining the client architecture focusing on sing-box integration and data flow for usage and subscription status. Clifton

@TechizeBuilder

Dear Client, I read "Universal Sing-Box VPN App Suite" carefully and understand you need a food delivery application built with Flutter for a smooth Android and iOS experience. I can develop the complete food delivery ecosystem including customer app, restaurant/vendor panel, delivery partner app and admin panel. Features can include restaurant listings, menus, cart, coupons, online payments, live order tracking, delivery assignment, push notifications and order management. A few quick questions: Do you need separate apps for customers, restaurants and delivery partners? Which payment gateway and map/location service do you plan to use? Thanks & Regards, Deepak

@mughiraaa

Hello, I have already completed similar cross platform applications and have strong experience in web development, APIs, authentication, real time data, and scalable software solutions. I can create the shared codebase for Android, iOS, Windows, macOS, and Linux, connect it with your existing backend and sing box core, and keep the architecture clean with minimal platform specific code. I can also handle CI builds, remote flags, subscriptions, usage tracking, and the custom branded UI. How are the existing sing box bindings exposed today, and do you already have UI mockups ready? I can quickly understand your existing setup and deliver exactly what you need. Let us schedule a quick discussion to go through the hooks and requirements. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira

@toriquldev123

Hello dear, Greetings from Md. Toriqul Islam! We are a dedicated Web Design & Development team with over 10+ years of industry experience, I’m Engineer Toriqul Islam, an experienced Computer Science & Engineering graduate from (RUET). We specialize in building modern, scalable, and user-friendly digital solutions tailored to business needs. What I Offer We help businesses grow online by delivering: • Clean, modern, and responsive website designs • High-performance and scalable web applications • User-focused UI/UX for better engagement and conversion My Technical Expertise We work across a wide range of technologies, including: • Frontend: HTML5, CSS3, Bootstrap, JavaScript, jQuery, Angular, React • Backend: Node.js, PHP, Laravel, .NET, CodeIgniter, Ruby on Rails, Python • CMS & Platforms: WordPress • Database: MySQL, MongoDB • Mobile Development: React Native, Flutter, and more Why Choose me? ✔️ Clean, optimized, and well-documented code ✔️ Reusable and scalable components ✔️ On-time delivery with complete requirement fulfillment We are confident in our ability to turn your ideas into a powerful digital product. Let’s discuss your project and make it a success. Looking forward to working with you! Best Regards, Md. Toriqul Islam

@abhishek060

Since your backend, authentication, subscriptions, usage tracking, and sing-box transport layer are already in place, I’d focus on the real challenge here: making that existing infrastructure work reliably through one Flutter client across five platforms. I’d first validate the sing-box hooks, platform requirements, and usage-data flow before building the complete UI. The Flutter layer can stay shared, while only the required VPN/native handling remains platform-specific. This also lets us identify any OS-specific issues early rather than during final builds. I’d then connect the existing APIs for authentication, subscriptions, feature flags, announcements and usage, while building the custom branded interface and CI pipeline for signed releases. One thing I’d confirm first: do you already have working sing-box bindings/hooks for any target platform, or should that integration be built from the core binaries? Please share the hooks, API documentation and UI mock-ups so I can review the integration path and confirm the scope.

@jonasdedzo

Hi there, I can build the cross-platform Flutter client around your existing sing-box infrastructure, keeping the UI, backend integration and sing-box bindings cleanly separated. I’ll implement token authentication, node selection, connect/disconnect, logs, real-time usage, subscription status, remote feature flags and JSON announcements. The shared codebase will target Android, iOS, Windows, macOS and Linux, with platform-specific glue kept minimal and native-feeling UI on each platform. I’ll also set up the sing-box core integration, handle subscription expiry and error states, and create CI workflows for repeatable builds. The 1% usage accuracy requirement can be validated against your server-side statistics during testing. I’ll provide source code, build documentation and a demo video. Looking forward to working with you. Thanks

@jagratip3

I can build this cross-platform VPN client with Flutter and a shared, maintainable codebase. I’ll integrate your existing authentication, usage stats, subscriptions, feature flags, announcements, and sing-box bindings while keeping platform-specific code minimal. I’ll deliver a polished branded UI, real-time usage accuracy, graceful subscription handling, CI pipelines for signed builds, clean architecture, documentation, and a demo video. I’m ready to review your sing-box hooks and mock-ups and start immediately.

@SherozKhalid9

Hi, I’ve worked on cross-platform mobile applications, backend integrations, authentication, subscriptions, and real-time data features, and I’d approach your sing-box client by keeping the UI, API layer, and sing-box bindings cleanly separated. Flutter is a strong fit here, with minimal platform-specific glue for Android, iOS, Windows, macOS, and Linux while keeping everything in one repository. I can build the branded client around your existing infrastructure, including: * Token-based authentication and secure session handling * Node selection, connect/disconnect, logs, and sing-box core integration * Live usage statistics synchronized with your server * Subscription status, expiry handling, and renewal prompts * Remote feature flags and JSON-based announcements * Native-feeling responsive UI across desktop and mobile * GitHub Actions CI for platform builds and signing I’ve also worked on VPN/networking applications, mobile apps with backend APIs, subscription systems, real-time usage tracking, and cross-platform Flutter projects, so I understand that the main challenge here is not simply creating the UI—it’s making the sing-box integration reliable across five operating systems. If you share the existing sing-box hooks/API documentation and UI mock-ups, I can review the architecture and start with the core connection flow and platform setup right away. Regards, Khalid,

@shawanay

I can develop a sing-box VPN client using Flutter with a shared codebase for Android, iOS, Windows, macOS, and Linux, including custom branded UI, token-based authentication, node selection, connection controls, real-time usage statistics, subscriptions, remote feature flags, and announcements. Let's connect so we can discuss more about it. Regards,\ Shawana

@technologiesit

As an experienced Full Stack Developer and AI Solutions Expert with 8+ years in the industry, I am confident that I have the technical skills and unwavering dedication that your project requires. I have a proven track record of delivering high-quality, highly-functional digital solutions on time and within budget. My extensive knowledge in Flutter for cross-platform app development is perfectly aligned with your project's needs. In addition to my broad skillset in Web and App Development, I have deep expertise in developing secure, clean-coded applications that scale effectively—a competence that will be crucial for a VPN solution like yours. Moreover, having worked on multiple projects dealing with data-usage tracking, remote feature integration, and third-party API integrations, I fully understand the significance of accuracy, smooth user experience, and flexibility in remote updates. Transparency is another cornerstone of my working style. Rest assured that you'll receive thoroughly-documented source code along with detailed build instructions for each platform. Furthermore, to enhance client satisfaction and enable efficient collaboration, I'll provide a concise video demo walking you through every element of the final product. Let's discuss your unique sing-box hooks and UI mock-ups, so we can quickly dive into the exciting challenges of your project!

@revival786

Greetings! I can build a polished cross platform client for your sing box VPN infrastructure using Flutter, compiling cleanly for Android, iOS, Windows, macOS, and Linux. I would implement a custom modern UI matching your brand, and wire the app to your backend for token based authentication, real time data usage, subscription status, remote feature flags, and remote announcements. I would wrap sing box binaries and expose connect, disconnect, node selection, and logs. I would ensure clean architecture, null safety, and minimal platform specific glue. I would deliver CI scripts for signed builds, meet all acceptance criteria, and provide source code and a video demo. Let me know your preferred timeline and I can get started. Thanks, Revival