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My existing iOS e-commerce app is due for a significant refresh and I’m looking for a developer who can step in quickly and guide it from its current stable release to the next level. The core build is written in Swift and maintained in Xcode; everything is already live on the App Store, handling product browsing, cart management, and Stripe-based checkout. Here’s where I need your help: • Modernise the UI so it feels fully at home on the latest iPhone and iPad screens, adopting SF Symbols, dark-mode support, and smooth animations. • Optimise performance and memory usage—startup times and scrolling in the product feed need to be razor-fast. • Integrate Apple Pay alongside the existing Stripe workflow, plus add Sign in with Apple to simplify onboarding. • Ensure every change meets current App Store Review Guidelines, with TestFlight builds supplied for each milestone and unit/UI tests demonstrating stability. • Provide clear, commented code via Git with concise release notes so my internal team can follow along. Acceptance criteria 1. A TestFlight build that passes Apple’s automated checks without warnings. 2. Checkout flow completes successfully with both Stripe and Apple Pay in sandbox. 3. All screens render without layout issues in light and dark mode across iPhone SE through iPad Pro. 4. Unit and UI test suites show ≥90 % pass rate on Xcode’s latest stable version. 5. Clean, documented Pull Request ready to merge into the main branch. If you have a track record of upgrading Swift-based, App Store-approved commerce apps, I’d love to see a couple of examples and hear how quickly you can get started.
Project ID: 40362112
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Active 10 days ago
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52 freelancers are bidding on average $141 USD for this job

Hello, Please share the source code of your iOS application along with a few additional details. I’ll take care of the rest( Modernise the UI, Fix the payment and improve overall functionality). 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.
$100 USD in 10 days
8.8
8.8

Hello, As a leading web development company in Pakistan, we understand the importance of bringing the 'WOW' factor to every project. This includes e-commerce apps written in Swift and we have a robust portfolio that showcases our expertise in precisely the kind of upgrade you're seeking. Our team is well-versed in working with Xcode, implementing appropriate functionalities such as Sign-in with Apple and Apple Pay, and overall optimizing performance to ensure your app runs seamlessly. The App Store submission process can be a complex task, but rest assured we have valuable experience navigating through it. We appreciate the need for stability and maintainability - not only will we provide TestFlight builds at every stage but also thoroughly test them to guarantee they pass 90% high on Xcode's latest version. Finally, if you're seeking an efficient turnaround time, you'll be pleased to know that our team is accustomed to busy schedules and adept at delivering projects on schedulewithout compromising the quality or attention to detail. Given the opportunity, we'd turn your app's upgrade into a reality that not only meets your expectations but also helps your business achieve new heights. I look forward to discussing this project further with you! Thanks!
$30 USD in 1 day
6.2
6.2

Hello, I can upgrade your existing Swift iOS e-commerce app modernizing the UI, improving performance, and integrating Apple Pay + Sign in with Apple alongside your current Stripe flow. I’ll ensure full App Store compliance, provide TestFlight builds, and deliver clean, well-documented code with tests. Ready to start immediately and share similar upgrade work.
$20 USD in 3 days
5.5
5.5

Hi! I can help you with upgrading your Swift e-commerce app. This is right in my wheelhouse. I've been building and maintaining iOS apps since 2014 and have handled exactly this kind of refresh before, modernizing the UI with SF Symbols and dark mode, adding Apple Pay alongside Stripe, and optimizing scroll performance in product feeds. I'm Edward and I take clean Git workflows seriously. Each milestone would come with a TestFlight build and documented PRs your team can follow. Happy to share some examples of similar commerce app upgrades I've done. Let me know if you want to chat.
$50 USD in 7 days
5.0
5.0

Hi, I understand you’re looking to elevate an already live Swift e-commerce app—modernising the UI, improving performance, and integrating Apple Pay and Sign in with Apple while staying fully compliant with App Store standards. I’ve worked on upgrading Swift/Xcode apps with smooth UI transitions (SF Symbols, dark mode), performance tuning (startup + scrolling), and secure payment flows including Stripe and Apple Pay. I’ll ensure clean Git-based delivery with TestFlight builds, strong unit/UI test coverage, and well-documented PRs so your team can seamlessly continue development. I can start quickly and structure milestones to meet each acceptance criterion without disrupting your current stability. Looking forward for your positive response in the chatbox. Best Regards, Arbaz N
$30 USD in 7 days
5.1
5.1

Hi, I’ve worked on upgrading live iOS apps built in Swift via Xcode, so taking your current stable e-commerce app to a modern, high-performance release is right in my lane. I’ll refresh the UI with SF Symbols, dark mode, and smooth animations, optimise startup/scroll performance, and integrate Apple Pay alongside Stripe plus Sign in with Apple—fully aligned with App Store guidelines. I’ll deliver clean Git-based PRs, TestFlight builds each milestone, and solid unit/UI tests to meet your ≥90% target. I can jump in quickly and share similar upgrade examples. Looking forward for your positive response in the chatbox. Best Regards, Hassan T
$30 USD in 7 days
4.9
4.9

As an experienced iOS developer with a track record of creating and upgrading successful mobile applications, I believe I am the perfect fit for your e-commerce app upgrade project. My comprehensive understanding of Swift and Xcode will allow me to seamlessly navigate through your codebase and implement the necessary enhancements. I'm genuinely well-versed in delivering retail solutions that meet Apple's ever-evolving App Store Review Guidelines. Not only do I bring an in-depth knowledge of iOS development to the table, but I also have extensive experience in optimizing app performance and memory usage - two aspects you specifically mentioned needed attention. My expertise in integrating Apple Pay, Stripe, and Sign in with Apple is a huge plus, as it aligns perfectly with your desire to streamline onboarding while maintaining a smooth checkout process. Moreover, my strong attention to detail is visible in all my deliverables - clean, commented code maintained via Git with coherent release notes. My ultimate goal is always your satisfaction, which is why I aim for a ≥90% pass rate on Unit and UI tests. Partnering with me will ensure you get a thorough solution that seamlessly merges into your existing system without any hassle. Let's give your e-commerce app the 21st-century upgrade it deserves!
$20 USD in 1 day
4.9
4.9

Hello, Sumit this side, hope the weather is great in Paisley. With a rich experience in building and upgrading commerce apps in Swift, I am well-prepared to help you modernize your iOS e-commerce app. Having worked at Google and Apple, I understand the significance of maintaining consistent performance and incorporating the latest guidelines to pass through Apple's stringent review process. My expertise will transform your app to feel fully at home on the latest iPhone and iPad screens, while adding value with SF Symbols, dark mode support, smooth animations and more. I appreciate the importance of streamlined payment processes in an e-commerce app which is why I excel not only in integrating multiple payment options like Stripe and Apple Pay but also enhancing them for a seamless user experience. Coupled with my adeptness at providing commented code via Git, clear release notes and ensuring thorough testing at each milestone, both you and your internal team can remain involved throughout the upgrade.
$20 USD in 7 days
4.4
4.4

Hi, I would like to grab this opportunity and will work till you get 100% satisfied with my work. I just applied after read your job posting carefully and I believe that I am good fit to your project. I'm a serious bidder. I will satisfy you with my high skills! I am an expert which have 10+ years of experience on Mobile App Development, iPhone, User Interface / IA, PhoneGap, Mobile App Testing, Swift, Google Maps API, Web Development, iOS Development, Mobile Development I am looking forward to meet you to discuss the further detail about this project. Looking forward to hearing from you. Warm Regards
$20 USD in 3 days
4.1
4.1

I can help you refresh and upgrade your existing iOS e‑commerce app so it feels modern, stable, and aligned with current App Store and iOS standards. I focus on improving performance, UX, and maintainability without disrupting your existing users or core business flows. I’ve worked on multiple Swift-based e‑commerce apps, including upgrades from older codebases, SDK migrations, and UI overhauls. This includes integrating updated payment gateways, fixing cart/checkout edge cases, and ensuring smooth compatibility with the latest iOS versions and devices. My approach would start with a quick review of your current codebase, dependencies, and known issues, then define a focused upgrade plan covering UI refresh, bug fixes, performance tuning, and any new features you want to add. I would love to chat more about your project! Regards
$20 USD in 7 days
4.2
4.2

With your e-commerce app needing an upgrade, I'm confident I can handle the task effectively. As an experienced Mobile App Developer with a strong proficiency in both Swift and Xcode, I have successfully upgraded several Swift-based, App Store-approved commerce apps. I’m adept at blending modern UI elements - like SF Symbols and dark mode support - with smooth animations to deliver sleek user experiences. On top of that, I have an excellent grasp on performance optimization techniques for iOS apps. With my skills in Flutter, React Native, and Swift, you can be sure that your app's startup times will be lightning-fast and scrolling will be seamless. Additionally, my expertise in integrating payment gateways such as Apple Pay (which you require) and Stripe will further streamline your app's checkout process. Moreover, my experience with Git ensures that I provide clean, well-commented code along with concise release notes essential for maintaining and scaling your app in the long run. To ensure stability, I religiously employ unit/UI tests - even more so when dealing with crucial features like payment systems. Seamless integrations like this are bread and butter to me. Let's get started swiftly (pun intended) on making your e-commerce app a more powerful tool for you and your customers! Thanks, Jay
$20 USD in 7 days
3.7
3.7

Hello Dear nice to meet you! I am very excited to apply for this job role. I have thoroughly reviewed the job description which clearly outlined what needs to be done. I can assist you with completing your app and help you get it ready for submission to the Apple App Store. With my extensive experience in iPhone app development, I can ensure that your app is properly optimized, tested, and ready for launch. Here’s what I offer: Bug fixes for your app (based on the issues you're facing). Assistance with uploading and publishing the app on the Apple App Store. Clean, robust code for any necessary improvements. Daily or weekly updates to keep you in the loop. Availability for communication 15 to 20 hours a day. Let’s get in touch to discuss the details further and ensure a smooth process for launching your app!
$30 USD in 1 day
3.0
3.0

Hello, I’ve reviewed your app refresh requirements and understand you need a fast, careful upgrade of an existing live Swift commerce app without disrupting what already works. I have experience with iOS development, Xcode, Git, Stripe, Apple Pay, and production app improvement work, and I can start quickly. I bring strong expertise in Swift, iOS development, Xcode, Stripe, Apple Pay, Sign in with Apple, Git, and UI modernization across iPhone and iPad. My focus would be updating the interface with SF Symbols, dark mode, and smoother interactions while also improving startup time, feed performance, memory usage, and checkout reliability. A key part of this project is keeping the app App Store-safe while making real improvements, so I’d work with milestone-based TestFlight builds, clean pull requests, and clear release notes your team can follow easily. I’m also comfortable adding unit and UI test coverage to support stable rollout and smoother review. I keep communication simple and friendly throughout the project. Quick questions: • Is the app built in UIKit, SwiftUI, or a mixed structure? • Do you already have an existing test suite, or should I extend coverage from the current baseline? I’d be glad to discuss the current app structure and help move it to the next level. Best regards, Carlos.
$20 USD in 5 days
2.7
2.7

Hi, I have experience working with iOS apps in Swift and can help upgrade your existing e-commerce app to meet the latest standards. I can modernize the UI (dark mode, SF Symbols, animations), optimize performance, and integrate Apple Pay and Sign in with Apple alongside your current Stripe setup. I’ll also ensure everything meets App Store guidelines with proper testing and TestFlight builds. I’ll provide clean, well-documented code and smooth handover for your team. I can start immediately—let’s discuss the next steps
$25 USD in 1 day
2.8
2.8

Hello, Hope you are doing fine. I have extensive Swift experience upgrading live iOS e‑commerce apps. I will modernize your UI (SF Symbols, dark mode, smooth animations), optimize performance (fast startup, scrolling), integrate Apple Pay alongside Stripe, and add Sign in with Apple. I will provide TestFlight builds, unit/UI tests (90%+ pass rate), and clean, commented Git commits with release notes. I ensure full App Store compliance. I can start immediately. Let’s discuss your codebase and timeline in chat. Best regards, Md Ruhul Ajom
$20 USD in 1 day
4.8
4.8

Hi there! Have you considered whether you want the animations to be custom-built or based on existing SwiftUI components for smoother updates down the road? Regardless, this is definitely something that I feel confident delivering on, given my past experience. I would love to discuss your project further! Looking forward hearing from you. Kind Regards, Corné
$10 USD in 14 days
2.5
2.5

As an experienced and versatile developer with more than 8 years in the industry, I believe I have the skills and knowledge you need to take your iOS e-commerce app to the next level. Having a deep focus on mobile app development and proficiency in Swift, Xcode, and iPhone platforms, I am well-poised to tackle all the elements that need upgrading. My past projects include successfully integrating Apple Pay into existing payment systems similar to what you're looking for. One of my notable strengths is my capacity to merge traditional software development practices with emerging technologies, which can be especially valuable during an upgrade project. I have a proven track record of creating sleek, modern UI designs that are tailored for specific device screens - a key requirement on your list. Furthermore, my unwavering commitment to producing clean, high-quality code ensures stability and meets the latest App Store Review Guidelines. In addition to my technical expertise, I bring a diligent attitude towards project management and effective communication skills. This means I can provide regular TestFlight builds for evaluation at every milestone and maintain clear documentation along with concise release notes. I'm confident my unique blend of skills will enable me to exceed your expectations and emerge as your ideal partner for this project. Let's discuss further how we can make your app better!
$18 USD in 2 days
2.0
2.0

Hi there, A strong iOS commerce app upgrade comes down to modern UI, fast performance, and seamless checkout. I can help you evolve your current Swift app into a polished, App Store–ready experience. My approach: • Refactor UI using SwiftUI (where suitable) while maintaining stability in existing UIKit flows • Implement SF Symbols, dark mode, adaptive layouts for iPhone SE → iPad Pro • Improve performance (lazy loading, image caching, optimized API calls, memory profiling) • Integrate Apple Pay alongside Stripe with smooth fallback handling • Add Sign in with Apple for frictionless onboarding • Ensure compliance with latest App Store Review Guidelines • Set up unit + UI tests and optimize for high pass rate • Deliver clean Git commits, PRs, and clear release notes What you’ll get: • TestFlight builds at each milestone • Fully responsive UI across devices and modes • Faster load times and smoother scrolling • Secure, reliable checkout with Apple Pay + Stripe • Maintainable, well-documented codebase I’ve worked on upgrading live Swift apps with focus on performance, UI consistency, and App Store compliance. Quick question: Is your current codebase fully UIKit-based, or have you already started adopting SwiftUI in some modules? Looking forward to helping you ship the next version smoothly. Regards, VK
$20 USD in 7 days
1.6
1.6

Hi, I just applied after read your job posting carefully and I believe that I am good fit to your project. I have thoroughly reviewed your requirements and I am confident in my ability to deliver excellent results. I'm a serious bidder. I will satisfy you with my high skills! I am an expert which have 8+ years of experience on Mobile App Development, iPhone, Objective C, iPad, Git, Stripe, iOS Development, Xcode I will work on your project hard with full time. I am looking forward to meet you to discuss the further detail about this project. Looking forward to hearing from you. Warm Regards
$25 USD in 7 days
1.4
1.4

Hi there. This upgrade will succeed if the current Swift app architecture, payment setup, and test baseline are audited first so UI refresh, Apple Pay, Sign in with Apple, and performance work land cleanly in the live codebase. The real risks are layout regressions across iPhone and iPad sizes, Apple Pay merchant setup issues, onboarding edge cases with Sign in with Apple, and performance tweaks that miss the real bottleneck. I would first profile startup and product-feed scrolling in Xcode Instruments, then trace the existing Stripe checkout, auth flow, and test coverage before changing UI layers. Is the app built in UIKit, SwiftUI, or a mix? What is the current iOS minimum version and Stripe SDK version?
$20 USD in 7 days
1.4
1.4

Paisley, United Kingdom
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Member since Feb 14, 2015
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