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Senior Mobile App Developer Needed for Full-Featured Cross-Platform App (iOS & Android) Project Description Hello, We are looking for an experienced mobile app development team or senior developer to build a high-quality, scalable mobile application for both iOS and Android. This is not a simple app. The project involves multiple advanced features including secure authentication, real-time data synchronization, cloud infrastructure, and a polished user experience. The goal is to develop a production-ready mobile application that can scale to thousands of users. Project Overview The app will allow users to: • Create and manage accounts • Securely store and manage sensitive information • Track activities and view analytics dashboards • Receive real-time notifications and alerts • Sync data across devices • Communicate with support through in-app messaging The application must focus on security, performance, and excellent user experience. Core Features 1. User Authentication Email & password registration Social login (Google / Apple) Two-factor authentication (2FA) Password reset flow 2. User Dashboard Personalized dashboard with data visualization Activity history Dynamic data updates via API 3. Secure Data Management Encrypted data storage Secure API communication User-controlled privacy settings 4. Notifications Push notifications (Firebase / APNs) In-app notifications Custom notification preferences 5. Real-Time Sync Data synchronization between devices Background data refresh 6. In-App Messaging Secure communication between user and support team Message history and attachments 7. Admin Panel (Web) User management Activity monitoring Basic analytics dashboard Technical Requirements Preferred Technologies: Mobile Flutter or React Native (cross-platform preferred) Backend Node.js / Python / Go REST or GraphQL API Database PostgreSQL / MongoDB Infrastructure AWS / Google Cloud / Azure Other Tools Firebase (notifications, analytics) Docker (optional but preferred) Security Requirements Secure authentication Data encryption API rate limiting Proper error handling Deliverables The developer/team should provide: • Fully functional iOS and Android applications • Backend API and database architecture • Admin dashboard • Clean and well-documented source code • Deployment support (App Store & Google Play) • Basic documentation for maintenance Required Experience Please apply only if you have: • Proven experience building complex mobile applications • Portfolio of production apps on App Store or Google Play • Strong knowledge of mobile security best practices • Experience with cloud infrastructure and APIs When Applying Please Include • Portfolio of similar apps • Tech stack you recommend for this project • Estimated development timeline • Your experience with scalable mobile applications We are looking for a long-term collaboration if the project is delivered successfully. Thank you.
Mã dự án: 40304310
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288 freelancer chào giá trung bình €1.278 EUR cho công việc này

**** Cross-Platform Mobile App Development with Secure Cloud Architecture **** I can develop your scalable cross-platform mobile application for iOS and Android using a robust framework like Flutter or React Native combined with a secure backend architecture. The platform will include secure authentication (email, social login, 2FA), encrypted data management, real-time synchronization, push notifications, and in-app messaging. • User registration and account management • Email/password authentication • Social login (Google, Apple) • Two-factor authentication (2FA) • Password reset and account recovery • Personalized user dashboard • Activity tracking and history logs • Secure encrypted data storage • Secure REST/GraphQL API communication • Push notifications and in-app alerts • Real-time data synchronization across devices • In-app messaging with support team • Message history with attachments • User privacy and notification settings • Admin web dashboard for user management • Activity monitoring and analytics • Cloud-based infrastructure and database • Secure authentication and API rate limiting Let’s chat… Thanks
€1.125 EUR trong 7 ngày
9,9
9,9

With over a decade of experience in mobile app development, I am confident that I can bring your vision to life. My name is Muhammad Awais, and my team at ZAWN Tech has successfully built complex applications catering to various industries including eCommerce, SaaS, and Blockchain. We are fluent in all the technical languages you require: Flutter, React Native, Node.js, Python... we speak your language! What sets us apart is our versatile approach and our tenacity in adhering to best security practices. With my deep understanding of mobile security combined with experiences in cloud infrastructure and APIs, we’re well-equipped to handle the requirements of this ambitious project. The clean and well-documented source code we deliver will ensure ease of maintenance for you in the long run. Our commitment to quality extends beyond just the final product. We offer deployment support on App Store & Google Play along with basic documentation for maintenance. Rest assured, you are teaming up with an experienced and reliable partner who guarantees scalable solutions - a core requirement for your project. I look forward to working together and delivering an app that exceeds your expectations!
€1.500 EUR trong 20 ngày
9,4
9,4

Greetings from Logictrix! My name is Jas, and I am looking forward to discuss about your app in details over the Chat or Call. We have enough app developers available in team so I can assure you to deliver this project at a fairly low cost with great quality and with a commitment for long term support. *** We have now earned 'Expertise' level in AI, ChatGpt and a couple of other AI platforms for App development and other Chatbot work! *** We have developed around 400+ Android and iOS apps using Native and Flutter SDK in the past 15 years, Many apps are Live in Google play and App store. We will share our detailed portfolio over the Chat once we connect. Looking forward to your reply... Thanks and Regards Jas
€800 EUR trong 15 ngày
9,7
9,7

I bring over 10 years of expertise in web and mobile development, specializing in building high-quality, scalable mobile applications. I understand the challenges of creating a robust app with secure authentication, real-time data sync, and cloud infrastructure. In the past, I have successfully developed advanced solutions in the fintech, eCommerce, and blockchain domains, delivering tailored products that drive results. My experience with AI/ML development ensures intelligent features for enhanced user experiences in your project. I am well-equipped to handle the core features you require, such as user authentication, secure data management, notifications, real-time sync, in-app messaging, and more. My proficiency in Flutter, Node.js, PostgreSQL, AWS, and Firebase aligns perfectly with your technical requirements. With a proven track record in building complex mobile applications, ensuring top-notch security and performance, I am confident in delivering a production-ready mobile application that meets your expectations. Let's discuss how we can make your vision a reality. Feel free to message me to take the next steps in creating your cross-platform secure app.
€1.200 EUR trong 20 ngày
9,1
9,1

Hi, This is Elias from Miami. I understand that you're looking to develop a cross-platform app that not only meets functional requirements but also prioritizes security and user experience. The goal is to create a robust solution that drives user engagement and business growth effectively. To achieve this, I would utilize React Native or Flutter for a seamless user interface across both iOS and Android. I'll ensure the backend is built using PHP or Python, focusing on scalability and security. Automated testing and CI/CD pipelines will be integrated to maintain high-quality standards throughout development. With over 10 years of experience in mobile app development, I have successfully delivered complex, scalable systems that are both secure and user-friendly. My background includes extensive work with backend integration and performance optimization, guaranteeing that the app not only functions well but also provides a superior user experience. Q1: What specific features do you envision being crucial for user engagement in the app? Q2: Are there any existing apps you admire that reflect the functionality or design you’re aiming for? Q3: What are your timelines for development and launch, and how do you plan to manage ongoing updates? Regards.
€1.200 EUR trong 20 ngày
8,5
8,5

Hello, Regarding your project, i would like to discuss the app features in detail to better understand your requirements. i am a mobile applications developer and i have more than 8 years of experience developing mobile applications with backend services. i have completed more than 520 projects either local or internet based. i am confident i will provide you quality software services on time. Let's chat to proceed.
€3.500 EUR trong 30 ngày
8,9
8,9

I HAVE BUILT SIMILAR SCALABLE CROSS-PLATFORM MOBILE APPLICATIONS WITH SECURE AUTHENTICATION, REAL-TIME DATA SYNC, AND CLOUD INFRASTRUCTURE DESIGNED TO SUPPORT THOUSANDS OF USERS. With 11+ years of experience, I can develop a **secure, high-performance cross-platform mobile application for iOS and Android** along with a scalable backend and admin dashboard. Core Features: • Secure **user authentication** (email login, Google/Apple login, 2FA, password recovery) • **Personalized user dashboard** with activity tracking and analytics visualization • **Encrypted data storage** and secure API communication • **Push and in-app notifications** with user preferences • **Real-time data synchronization** across devices • **In-app messaging system** between users and support • **Admin web panel** for user management, activity monitoring, and analytics User Roles: • **Admin:** Manage users, monitor activity, and view analytics • **Users:** Manage accounts, store data securely, track activity, and contact support Recommended Stack: Flutter or React Native, Node.js backend with REST/GraphQL APIs, Happy to discuss the architecture, timeline, and best approach for building your production-ready application.
€860 EUR trong 7 ngày
8,5
8,5

Hi there, I can lead the development of your full-featured cross-platform mobile app for iOS and Android, ensuring security, scalability, and a polished user experience. I’ll handle everything from user authentication (email, social login, 2FA) to real-time data sync, push notifications, and in-app messaging, along with a web-based admin dashboard for user and activity management. I recommend a Flutter front-end for truly cross-platform performance, paired with a Node.js backend and PostgreSQL for structured, scalable data management. Cloud hosting on AWS or Google Cloud will support high availability and secure API interactions. Deliverables will include fully functional mobile apps, backend architecture, admin dashboard, well-documented source code, deployment support, and a maintenance guide. My approach ensures clean, modular code, robust security, and seamless real-time synchronization across devices. Thanks.
€750 EUR trong 10 ngày
8,3
8,3

I am a senior mobile app developer with extensive experience building secure, scalable cross-platform applications using Flutter and React Native. I have delivered production-ready apps with real-time sync, encrypted data storage, push notifications, and admin dashboards for both iOS and Android. I can design and implement the full backend, database, and cloud infrastructure while ensuring top-notch security and a polished user experience. I would be excited to bring your project to life and provide a long-term, maintainable solution.
€1.125 EUR trong 7 ngày
8,3
8,3

Hi, This looks like a solid full-featured mobile platform, and I’ve worked on similar scalable systems with secure authentication, real-time sync, and cloud-based APIs. For a project like this I’d recommend a Flutter cross-platform app, with a Node.js backend and PostgreSQL, deployed on AWS, using Firebase for push notifications and analytics. This stack works well for performance, scalability, and secure data handling. I’m comfortable building the full flow including authentication (with 2FA), real-time updates, secure data storage, notifications, and the admin dashboard. I can also assist with deployment to App Store and Google Play. Happy to share relevant app examples and discuss architecture if you’d like. Best, Yuda
€1.125 EUR trong 30 ngày
7,9
7,9

Hi. Using Flutter, I can build your app for Android and iOS. I am very familiar with Flutter and Cloud App. I have mobile and backend skills with 8+ years. I wish to work for you. Thanks for attention.
€750 EUR trong 12 ngày
7,8
7,8

Hello, we reviewed your requirement for Full Stack Developers for a cross‑platform Web & Mobile App. Projects like this typically involve designing and building responsive frontend interfaces, secure backend APIs, and cross‑platform mobile apps that work seamlessly across devices. Ambient Infotech has strong full stack experience with PHP, modern JavaScript frameworks, mobile apps, and backend development. We can provide skilled developers who can handle both frontend UI and backend logic, integrate APIs, and ensure the application works smoothly on web and mobile platforms. Quick question: which frontend and mobile frameworks are you planning to use (React, Vue, Flutter, etc.)? Best regards, Ambient Infotech
€950 EUR trong 10 ngày
7,8
7,8

I have 6+ years building cross-platform apps with Flutter and React Native. I've delivered 15+ production apps with secure authentication, real-time sync, and admin panels. My tech stack: Flutter for mobile, Node.js/Python backend, PostgreSQL/MongoDB, Firebase for notifications. I'll provide clean codebase, deployment support, and documentation. Timeline: 4-6 weeks for full-featured app with all requirements. Ready to start immediately.
€1.125 EUR trong 7 ngày
8,1
8,1

Hello hope you are doing well I've noticed that the most critical challenge in a project of this scale is ensuring secure, real time synchronization across devices while maintaining high performance and a polished user experience as the number of users grows. Many complex apps face issues later when the architecture is not designed for scalability and security from the start. I have experience building production ready cross platform apps using Flutter and React Native with secure authentication, encrypted data storage, push notifications, and admin dashboards. My approach ensures the app is reliable, maintainable and protected from future performance or security problems, not just functional today. Could you share the expected peak user load and data volume so the backend and sync architecture can be optimized from day one? PS: I can start immediately and deliver this project as quickly as possible, guaranteeing your complete satisfaction and unlimited revisions. If my offer suits you, we would be happy to discuss your project in more detail. Best Regards Hammad Hassan
€1.200 EUR trong 7 ngày
7,8
7,8

As an experienced and versatile software development team, we are perfectly suited to not only meet but exceed your expectations for this project. Having successfully built complex mobile applications, our track record is proven and available to you for firsthand verification. We have a deep understanding of mobile security best practices that your project demands, which is established in our well-received apps currently live on App Store and Google Play store. We wholeheartedly recommend using Flutter for this project due to its cross-platform advantages without compromises on performance or user experience. Combined with our proficiency in Node.js backend work, databases like PostgreSQL & MongoDB, cloud platforms such as AWS & Google Cloud, plus special tools including Firebase; your app will be developed leveraging the best-in-class technologies that produce world-class results. More than just being tech-savvy, we also establish client-centered good-experience through detailed yet comprehensible documentation and timely deliveries. Regarding scalability, our experience is key; over time we have mastered the art of building products that can keep up with fast-growing user-bases like. Clear communication lays at the bedrock of everything we do; with us, you'll never feel out of the loop or lack support.
€1.500 EUR trong 1 ngày
7,5
7,5

Hi there, We’ve developed several secure, scalable mobile apps with advanced features like 2FA, encrypted data storage, and real-time notifications. One of our recent projects, Descripio, involved building a web app that used Chrome and Firefox extensions to extract product data from Amazon and eBay, and then generate optimized product descriptions using OpenAI’s LLM. We also integrated Stripe for subscription management and implemented a robust admin panel for user management and activity monitoring. We can use either Flutter or React Native for your app, depending on which is more suitable for your specific requirements. I’d love to schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. Let’s connect and get started on this exciting project. Best, Adil
€1.142,78 EUR trong 21 ngày
7,4
7,4

Dear Client, With profound experience developing complex mobile apps and a robust skill set in the preferred technologies, I am confident that I can deliver the cross-platform secure app you are looking for. Throughout my career, I have built numerous highly scalable mobile applications with a strong focus on security and performance precisely what your project demands. Your project description highlights critical features such as secure authentication, encrypted data storage, real-time synchronization which all fall within my areas of expertise and have been core to many successful projects I've delivered. Additionally, my mastery in REST and GraphQL APIs, backend architecture (Node.js, Python), database management (PostgreSQL, MongoDB), and Docker proficiency strengthens my candidacy against the specific technology requirements you mentioned. What sets me apart is my passion for delivering not only quality code but also a seamless user experience. Given that your application will handle sensitive data and high volume usage, this differentiator cannot be overstated! My track record speaks for itself having developed multiple applications akin to what you envision, I am comfortable working within demanding timeframes to provide tangible deliverables while ensuring future scalability. Let my future-forward approach align with your long-term collaboration needs!! Thank you!!!
€1.200 EUR trong 7 ngày
7,8
7,8

You're building a production grade mobile platform secure auth with 2FA, real time sync, encrypted data management, push notifications, in app messaging, and a web admin panel. Complex scope, high security bar, built to scale. You've structured this well. The feature set is clear, the security requirements are specific, and the "not a simple app" framing tells us you've thought through the risks of getting this wrong. Our recommended stack: Flutter for iOS and Android native performance, single codebase, scales cleanly. Node.js backend with PostgreSQL for structured data, REST API with GraphQL available where query flexibility matters. Firebase for push notifications and real time sync. AWS for infrastructure with Docker containerization for clean deployments. Security built in from architecture encrypted storage, 2FA, rate limited APIs, secure communication throughout. Not retrofitted after launch. Admin panel covering user management, activity monitoring, and analytics dashboard operational from day one. We share production app portfolio directly in chat App Store and Play Store links included. Plan D Studios 12+ years delivering complex mobile apps, SaaS platforms, and secure API integrations. All in house. Long term collaboration is exactly how we prefer to work. What's the core use case what sensitive information are users storing and managing? Let's talk stack and timeline. Message us. Regards, Haider
€1.350 EUR trong 30 ngày
7,4
7,4

With your project requiring an experienced hand and keen understanding of mobile app development, I am confident I can be the freelancer to bring your vision to life. Having been a part of the ever-evolving world of IT for over 16 years, I have deep knowledge in Node.js and Python - two powerful backend frameworks that can ensure top-notch performance and security for your app. Alongside my extensive skills in GoogleAds management, Data processing, and other areas, I bring a well-rounded understanding of digital marketing that can lend a dual advantage to your project. I understand the weight that comes with managing sensitive information securely and the need for optimum performance even as user numbers climb. My experience allows me to be proactive in ensuring every element of the apps' architecture - from user authentication to data encryption- is designed for fortification. With a Full-Stack developer's hat on, I have successfully built complex apps with similar functionalities and more like yours; some are presently live on App Store and Google Play. My suggestion for the tech stack is Flutter or React Native for mobile development due to their cross-platform compatibility. Utilizing Node.js or Go in conjunction with GraphQL API and MongoDB for backend would grant great speed, flexibility, and scalability. And let's not for
€1.500 EUR trong 99 ngày
7,8
7,8

Hi, For your project "Full-Stack Developers for Cross-Platform Secure App", We provide complete frontend to backend development with clean, scalable, and high-performance solutions tailored to your requirements. Our experienced team ensures modern UI/UX, secure architecture, smooth functionality, and full support until successful deployment. Let’s build a reliable and impactful product together. Regards, Muhammad Abdullah
€1.125 EUR trong 7 ngày
7,2
7,2

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