Cross-Platform App, Secure Full-Stack Web

@pinkeegupta

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native and for web and backend on react js and node js, Python Django , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@nadeemkhan7

Hello, I went through your project description and it seems like that I am a great fit for this job. I have an expert team with many years of experience in JavaScript, Python, Django, AngularJS, Web Development, React Native, Flutter, Next.js. Please come over chat and discuss your requirement in a detailed way. Regards

@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

@chiragardeshna

Hi there, Strong alignment with this project comes from delivering cross-platform apps and full-stack systems where performance, consistency, and security are essential. Clear understanding of unified development across mobile and web, with scalable architecture, consistent UI/UX, and OWASP-aligned security practices. Hands-on expertise with frameworks like Flutter/React Native and modern backend stacks ensures maintainable code, smooth deployment, and native-like performance. Risk is minimized through structured milestones, threat modeling, continuous testing, and validated security practices before release. Available to start immediately happy to discuss stack and timeline. Recent work: https://www.freelancer.com/u/chiragardeshna Regards Chirag

@Menaga3777

With my diverse skill set encompassing UX/UI design, front-end and back-end development, and experience working with cutting-edge frameworks like Flutter and React Native, I am perfectly positioned to tackle your project. Having successfully built mobile applications like the Pet Care, Laundry and Food Delivery Apps across multiple platforms, I assure you a seamless cross-platform application for iOS, Android, and Windows with maintainable codebase. Similarly, my expertise in database architecture and responsive front-end development will ensure that your website is robust, functional, and user-friendly. Moreover, my thorough understanding of OWASP best practices grants me the capability to build secure applications from ground up. This includes conducting initial threat modeling, creating test scripts and conducting thorough pen testing before final delivery. I have prided myself throughout my career on delivering quality work promptly and professionally. By selecting me to spearhead your project, you’ll not only be gaining access to nearly a decade of development experience but also working with someone who values robust security architecture as much as you do. Rest assured that my past clients can attest to my commitment to excellence and effective communication throughout all stages of development. Together, we can bring your vision to life without compromising on efficiency or security.

@vivekku410

Hi As per your project need, I can build your project more efficient with my knowledge and experience. I'm looking to work with you and I'm very sure that you'll feel great to work with me. Along with your project requirement, I'll provide you clean source code with free bug fixing and maintenance. I Have 8.2 years of work experience in web and mobile Apps development(React JS and React native). I have worked on so many projects. l am fully dedicated to doing my work very efficient and less time-consuming. "Looking forward to your positive response please open your chat window to more details" Thanks. regard, Vivek

@zongfeiz3

Hi! I can build your bot with Python. Experienced with Telegram/Discord bots, custom commands, and API integrations. Fast delivery, clean code. Let's discuss details!

@Marcoa011

This Project caught my eye, so I had to reach out. Your focus on a single, integrated build for cross-platform mobile and full-stack web, with rigorous OWASP-based security, perfectly matches my skill set. I specialize in delivering clean, user-friendly apps that feel native and perform seamlessly across iOS, Android, Windows, and web environments. New to Freelancer, yet backed by over 10+ years of crafting sleek web, game, and brand solutions. Let’s create something exceptional together. I would love to chat more about your project! Regards, Marco Agrela

@aurvixlabs

Building a single, secure codebase for cross-platform mobile (iOS/Android/Windows) and a full-stack web app requires a unified React/React Native + Node.js stack to ensure maintainability and a native feel. In the mBART50 Translation API project, I designed and deployed a scalable, secure backend with multiple engines, directly applying the OWASP principles you require. My AWS ML Security certification and expertise in JavaScript, Python, React, and Node.js fit your stack perfectly. I'd approach this in three clear milestones—architecture, core build, and security hardening—to deliver working components early. For the 'consistent visual language' across platforms, are you planning to use a specific design system like Material-UI or a custom component library?

@singhpritpal225

Django Backend Services I propose to develop a secure, scalable Django backend to power both a cross-platform mobile app (iOS, Android, Windows) and a responsive web application. The backend will act as a single source of truth, exposing REST or GraphQL APIs for seamless integration with mobile and web clients. Scope & Features: Authentication & Authorization: JWT with refresh tokens, role-based access control. Database: PostgreSQL/MySQL with migrations and optimized schema. Security: OWASP-aligned best practices, input validation, encryption, rate limiting, CSRF/CORS protection. API Documentation: Swagger/OpenAPI or GraphQL Playground. Testing: Unit & integration tests to ensure reliability. Deliverables: Fully functional Django backend with APIs. Database migration scripts and seed data. Security documentation including threat model and OWASP checklist. Private Git repository with commit history. Timeline: 1. Design & DB modeling – 1–2 weeks 2. Core backend build – 3–4 weeks 3. Security hardening – 1–2 weeks 4. Testing & deployment – 1 week 5. Documentation & handover – 1 week Benefits: Single maintainable backend for all platforms Security-first approach protecting user data Scalable, well-documented, frontend-ready APIs Next Steps: Approve scope, provide staging/hosting access, finalize API & database design. ---

@vetalh3

Good day. I've reviewed the task and would be happy to collaborate. Since I don't have a rating on this service yet, but I have extensive proven experience, I'm ready to complete the task at a competitive price. I'd be happy to collaborate.