Upgrade existing mobile app

@om26er

Hello, Share the source code so i can start updating your app right away. i am a mobile applications developer and i have more than 8 years of experience developing mobile applications with backend services. i have developed many Business Solutions from scratch to Stores ready applications. i have completed more than 550 projects. i have live sample apps for you. i am super confident i will provide you best quality software services on time and on budget. Let's chat to proceed.

@corpmember29

Hello, I have carefully reviewed your requirements and understand that you need to upgrade your existing React Native mobile application by improving its features, performance, and overall functionality while ensuring seamless integration with your MERN stack backend. I have 10+ years of experience in React Native, Node.js, MERN Stack, iOS, Android, and full-stack development, and can deliver clean, scalable, and well-tested enhancements without disrupting your existing application. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL FOLLOW AN AGILE METHODOLOGY AND I WILL ASSIST YOU THROUGH THE ENTIRE PROCESS FROM DEVELOPMENT TO DEPLOYMENT. I am available to start immediately and eagerly await your positive response. Thanks.

@kamran2012

Good to see this project, I will upgrade your React Native frontend and merge it with your MERN backend, ensuring the existing MongoDB APIs stay backward compatible throughout the process. On a similar RN upgrade, I tested every screen on a staging build first, so the live app stayed untouched until final deploy. I will do the same here. Questions: 1) Which React Native version is the app currently running? 2) Are there specific Node.js packages or CI/CD pipelines that must carry over unchanged? Share your current repo access and I will review the codebase tonight. Looking forward to discussing further. Best regards, Kamran

@webbookstudio

Hi there, We understand you're looking to upgrade an existing mobile app, utilizing React Native for a seamless iPhone and iPad experience, with a full-stack development approach using the MERN (MongoDB, Express, React, Node.js) stack. At Webbook Studio, we have extensive experience in mobile app development, including a music voting mobile app built with React Native, React.js, and Node.js. Our team is well-versed in JavaScript, HTML5, and iOS development, ensuring a high-quality upgrade for your app. We'll deliver a fully functional and tested mobile app upgrade. Can you share more details about the current state of your app and what specific features or improvements you're looking to implement in the upgrade? Feel free to message us to discuss the details! — Webbook Studio

@extreamcode

Hi ClientFirstName, I can see this isn’t just an app upgrade, it’s the kind of project where a small change in React Native or Node can quietly affect the whole stack. I’ve handled mobile app and MERN updates where frontend stability, API behavior, and iPhone compatibility all need to stay aligned, so I can step in carefully and keep the upgrade clean. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. I’d approach this by reviewing the current React Native app, the Node/MERN backend flow, and any iOS-specific issues before making changes, so we improve the app without breaking what already works. If you’d like, I can start by checking the current structure and outlining the safest upgrade path for both app and backend. Which parts of the upgrade are most important to you right now: UI changes, bug fixes, API updates, or iPhone-specific compatibility? Best regards, Asad

@edwarddzi8f

Hi there, I can help you with the upgrade on your React Native app. Since you mentioned full stack and MERN, I'm guessing there's backend changes too. I've done a bunch of React Native upgrades over the years, migrating from older versions and refactoring components. I'm Edward and have been working with React Native since 2016. Let me know what specific upgrades you're looking at and I can give you a clearer timeline. Happy to chat more about this.

@InterconnectBPO

I specialize in upgrading mobile apps to enhance user experience and functionality. With our expertise in React Native and full-stack development, we can help elevate your app to the next level. I noticed your emphasis on using MERN stack and Node.js for the project, showcasing your focus on robust and scalable solutions. We understand the importance of seamless integration and efficient performance in mobile app development. Our team brings a wealth of experience in mobile app upgrades and has received 20+ 5-star reviews on similar projects. We are confident in our ability to deliver top-notch results that exceed your expectations. THE WORST THAT CAN HAPPEN IS YOU WALK AWAY WITH A FREE CONSULTATION! Regards, InterconnectBPO

@XanvraTECH

Hello, I am very interested in your project to upgrade the existing mobile app with expertise in iOS Development, Mobile App Development, MERN, iPhone, JavaScript, Full Stack Development, Node.js, and React Native. I have a deep understanding of the project requirements and am confident in my ability to deliver high-quality results. I will approach this project by thoroughly analyzing the current app, identifying areas for improvement, and implementing enhancements using the latest technologies and best practices in mobile app development. - MY WORK STATS: ✨ https://www.freelancer.com/u/XanvraTECH I would love to discuss this project further and explore how I can contribute to its success. Looking forward to the opportunity to collaborate. Best regards, Warda Haider

@DeveloperStation

Hi there, We’ve developed several mobile apps using React Native, including a fully functional iOS app that was later converted to a web app. We also have extensive experience with backend technologies like Node.js and PHP, as well as server management with AWS and DigitalOcean. In addition to React Native, we’ve worked with other frameworks like Flutter and Ionic, giving us a broader perspective on mobile development. 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. I’m eager to learn more about your exciting project. Best, Adil

@codefusion53

Hi I understand you are looking for a hands-on upgrade of an existing mobile app built with React Native and a MERN stack, focusing on delivering a polished iPhone/iPad experience and a solid full-stack foundation with scalable, maintainable code. I’m a results-driven developer experienced in AI-enabled tooling and full-stack web/mobile projects. My approach is to turn complex toolchains into repeatable, production-ready workflows—delivering clear next steps, measurable outcomes, and reliable delivery across both frontend and backend layers. For your project, I would structure the work into focused phases: assess the current app and infra, outline target architecture and component upgrades, implement UI/UX refinements and React Native optimizations, and harden the Node.js/MERN backend with robust APIs and data flows. Each phase ends with a concrete artifact—updated code, a testing checklist, and a rollback plan—so you always know what to review next and can validate progress against your critical use cases. I will also provide concise reference guides and a lightweight deployment and testing checklist to help your team reproduce the improvements and maintain momentum after hand-off. Best, Justin

@SBITServices

Hi there, I am a skilled mobile app developer with expertise in React Native and full-stack development using MERN stack technologies. With my experience in building and upgrading mobile apps for iOS devices, I am confident in enhancing your existing app to meet your requirements. I will utilize my knowledge of Node.js for backend development, along with React Native for frontend enhancements, ensuring a seamless user experience. My focus will be on optimizing performance, implementing new features, and providing a stable app upgrade. Let's collaborate to elevate your mobile app to the next level. Thank you.

@teodorgeorge

Hello, I have solid experience upgrading React Native mobile apps backed by Node.js/MERN stacks, including iPhone-focused builds, API integration, bug fixing, and performance improvements. I understand you need support improving an existing mobile app across the full stack. I can review the current codebase, identify upgrade needs, update the React Native app and Node/MERN backend cleanly, then test the changes so the app is stable and ready to move forward. Please connect in chat so we can discuss the app’s current state and the exact upgrade scope. Best regards, Teo

@kaustubhkpatil

Being a highly skilled and experienced Mobile Phone Developer with an extensive background in the development of iPhone apps, I believe I am the perfect fit for upgrading your existing mobile app. Firstly, my proficiency in React Native, MERN stack, and Node.js perfectly aligns with the requirements mentioned in your project description. These skills ensure that I can successfully handle any challenges involving your mobile app. Moreover, I understand the value of delivering within stipulated time frames without compromising on quality, making me an incredibly reliable choice for executing your project. Having worked on various iPhone app projects, I have proven my ability to enhance app performances and introduce new features seamlessly. In conclusion, my track record of providing excellent outputs and my meticulous approach to handling critical situations make me confident that with me on board, your existing mobile app will be upgraded to a higher level of functionality and performance. Let's collaborate and create something exceptional together!

@Curveballsol

Hello, I understand that you are looking to upgrade your existing mobile app using React Native and MERN stack technologies. With expertise in JavaScript, Mobile App Development, iOS Development, Node.js, and React Native, I am confident in my ability to successfully enhance your app. I will ensure effective communication throughout the project to keep you informed on the progress and address any feedback promptly. My portfolio includes successful projects in mobile app development, showcasing my skills in creating user-friendly and efficient applications. I am excited about the opportunity to work on this project and deliver a high-quality mobile app that meets your requirements. You can view my portfolio at https://www.freelancer.com/u/Curveballsol Best regards, Curveball Solutions

@KavyaTechNepal

Namaste, I’d love to help upgrade your existing mobile application. With experience in React Native, MERN Stack, Node.js, iOS/Android development, and API integrations, I can enhance your app, fix issues, add new features, optimize performance, and maintain a clean, scalable codebase. What I Can Deliver: . React Native feature enhancements . Backend/API improvements with Node.js . Bug fixes and performance optimization . iOS & Android compatibility . Clean, well-documented code . Testing, deployment, and post-update support I’m ready to review your existing codebase and start immediately. Best regards, Amit G. Kavya Tech Nepal

@vladang

It looks like you're after someone who can handle both the React Native app and the backend without splitting the work across multiple developers, which usually makes development much smoother. I'd start by understanding the core user flow, then build the API and database structure around it before connecting the mobile app. That keeps the frontend moving against stable endpoints instead of constant changes. From there, I'd focus on authentication, data syncing, and handling offline or failed network requests so the app stays reliable in everyday use. I'd also pay attention to keeping the UI responsive across both iPhone and iPad rather than treating larger screens as an afterthought. I recently worked on a full-stack project using React on the frontend and Node.js on the backend where keeping the API clean made future features much easier to add. If there are already designs or API specifications, I can start with those immediately. Otherwise, I'm happy to help shape them and get development underway.

@johnallenvillan1

Hi there, Your React Native mobile app needs an upgrade across iPhone, MERN, and Node.js, and I can handle the full-stack side cleanly. I’ve spent the last 4 years solving exactly this type of problem. I’ve delivered two app modernization projects: one where I stabilized a React Native iOS release, and another where I refactored a MERN/Node backend to support faster mobile sync and fewer crashes. The real risk here is not just adding features; it’s keeping the mobile build stable while changing APIs, state flow, and backend contracts at the same time. I’ll update the app in isolated steps, verify iPhone compatibility, and tighten server endpoints so the frontend and backend stay aligned. I’ll review the current React Native structure, identify upgrade blockers, patch the Node/MERN integration points, and validate the build on iPhone. I’ll keep changes documented and separated so future work stays maintainable. Best regards, John allen.

@bcosley

Hi, Upgrading a React Native app with a MERN back end means tightening the bridge between the mobile UI and server, while preserving existing users and data integrity. I’ve shipped similar upgrades where I validated critical flows, guarded against regressions, and staged changes to production with feature toggles and targeted QA. I’d start by validating the current user flows, API contracts, and data syncing, then push changes incrementally with careful migration steps and automated checks. One technical risk: data migrations and cache invalidation across devices can create subtle inconsistencies if not sequenced properly. What should happen if a user has unsynced changes when the update lands? Are there any data migration constraints or downtime windows I should plan around? If we're aligned, I can outline the implementation phases before kickoff. Best regards, Brandon

@CodeAnchors

Hello, I hope you're doing well. I understand the importance of upgrading your existing mobile app to enhance its performance and user experience. With expertise in Mobile App Development, React Native, Full Stack Development, and Node.js, I am well-equipped to assist you in achieving this goal. My approach involves structured requirement confirmation, controlled planning, clean implementation, rigorous testing, and milestone-based transparency to ensure a successful project delivery. By focusing on the real business objectives behind the upgrade, I aim to provide long-term results that align with your goals. You can view my portfolio here: ⭐⭐ https://www.freelancer.com/u/CodeAnchors ⭐⭐ Could you please share more details about your priorities or specific business goals for this project? I would love to discuss how we can work together to finalize the scope smoothly. Best regards, Muhammad Anas Khan