Shopify Custom Checkout App

@irsolutions

With over a decade of experience in web and mobile development, I understand the unique challenges you face in needing a custom Shopify checkout app that meets your specific requirements. Your need for full control over payment options, checkout design, and shipping methods is crucial in providing a seamless shopping experience for your customers. In the realm of eCommerce solutions, I have successfully delivered tailored products that drive results for businesses like yours. My expertise in creating secure integrations with external services aligns perfectly with your project needs. I have a proven track record of building custom solutions that meet and exceed client expectations. I am confident in my ability to create a private or public Shopify app that matches your UI mock-ups, integrates alternative payment gateways, and optimizes conditional shipping rates, all while ensuring compliance, security, and performance. Let's collaborate to bring your vision to life – reach out to me to discuss further details and take the next step towards achieving your project goals.

@technosystem

With a solid portfolio showcasing my expertise in JavaScript, Node.js, PHP, Ruby, and Shopify, I am confident in delivering the Shopify Custom Checkout App you require. My extensive experience encompasses everything from developing and publishing various mobile apps to delivering scalable eCommerce solutions. This unique skill set allows me to tailor a private or public Shopify app (Node or Ruby) that meets your needs while ensuring clean, well-documented code that's easy for your team to navigate. One of the vital criteria for your project is the successful integration with external services such as your chosen payment gateway, rate-shopping API, and CRM; areas I've excelled in during previous projects. My proficiency here guarantees non-faulty third-party calls both in staging and production environments with an average latency of less than 300 ms. Moreover, I understand the need for flexibility in projects while adhering to deadlines. Thus,I offer a composition of quick response time and efficient development to ensure your demo-ready checkout flow is delivered within three weeks.

@OutsourceMan

As a seasoned professional with 18 years of industry experience, I - Raman from CnELIndia understand the precision and finesse that this project requires. Our track record speaks for itself with over 743 satisfied clients, demonstrating our capacity to meet both time and budgetary constraints. Our proficiency extends across diverse programming domains such as API Integrations, JavaScript, Node.js, PHP, Software Architecture and a particular focus on Shopify. Given your specific requirements for a Shopify custom app, our expertise in this platform is surely to provide you the best solution to replace Shopify's standard checkout and give you complete control over UI, payment options and shipping methods. Not only will we ensure a flawless integration with all third-party APIs including payment gateway and CRM but will also deliver a comprehensive install/uninstall guide along with a brief video walkthrough so that your non-technical staff can manage future toggling without any coding. Within your specified flexible timeline of three weeks, we assure you code that not only passes Shopify's compliance checks but exceeds in delivering real orders end-to-end. So choose us for proficiency that balances efficacy and finesse!

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in PHP, JavaScript, Ruby on Rails, Software Architecture, Node.js, Shopify, Ruby, API Integration and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@doomshellsl

Hello, At Doomshell Software Pvt. Ltd., we specialize in advanced Shopify app development and custom checkout experiences that balance flexibility, performance, and compliance. We can build a robust Shopify app (Node/Ruby) that replaces and extends checkout functionality—giving you full control over payment options, dynamic shipping logic, and a fully customized UI aligned with your mockups. Our team will also integrate your external services (payment gateway, rate API, CRM) with secure, optimized calls to ensure <300 ms latency and smooth order processing. We’ll deliver clean, well-documented code along with an intuitive admin panel so your team can manage settings without technical dependency. The solution will be tested end-to-end to meet Shopify compliance, performance benchmarks, and real transaction flows. You’ll also receive setup documentation, a walkthrough video, and post-launch support for refinements. A few quick questions to align: • Are you on Shopify Plus? • Which payment gateway and rate APIs are we integrating? • Do you already have UI designs finalized for checkout? • Any specific CRM workflows or tagging rules post-purchase? Let’s connect and build a seamless, high-performance checkout experience. Best Regards,

@corpmember29

HELLO, I HAVE CAREFULLY REVIEWED YOUR REQUIREMENTS AND FULLY UNDERSTAND THE NEED FOR A CUSTOM SHOPIFY CHECKOUT APP WITH CONTROL OVER PAYMENT OPTIONS, SHIPPING RULES, AND UI DESIGN. I HAVE 10+ YEARS OF EXPERIENCE IN SHOPIFY APP DEVELOPMENT, NODE/RUBY BACKEND, AND API INTEGRATIONS, AND CAN DELIVER: Private/public Shopify app installed in your test store Custom checkout flow matching your UI mock-ups, with alternative payment gateway and conditional shipping logic Secure integrations with payment, rate-shopping API, and CRM for post-purchase tagging Simple Shopify Admin settings panel for non-technical staff Written install/uninstall instructions and short video walkthrough One round of post-launch tweaks based on feedback I WILL PROVIDE 2 YEARS OF ONGOING SUPPORT AND COMPLETE SOURCE CODE, WORK USING AGILE METHODOLOGY, AND ASSIST FROM ZERO TO LIVE DEPLOYMENT. I EAGERLY AWAIT YOUR POSITIVE RESPONSE. THANKS

@solutionsplayers

As a full-stack developer with extensive experience in JavaScript, PHP, and Shopify, I am confident in my ability to deliver a top-notch, custom checkout app that meets all of your project's needs. Throughout my 6+ years in the field, I have consistently created high-performance web applications that not only meet client requirements but also drive tangible results. My technical skills include proficiency in React JS & Bootstrap for front-end, PHP & Laravel for back-end, and MySQL & SQLite for database management - all of which are perfectly aligned with your project! In addition to my technical proficiency, I believe my client-centric approach sets me apart. Your satisfaction is at the core of my development process. With every project, I ensure clean code and comprehensive documentation to enable easy maintenance and enhancement, ensuring that even non-technical staff can make adjustments without any hassle. Lastly, rest assured that I will not abandon you once the project is completed — I offer reliable post-launch support and maintenance to tackle any unforeseen issues swiftly. My aim is always to build professional relationships based on trust and excellence which translates into high-quality work and satisfied clients. Let's make your e-commerce vision reality together!

@arbu1499

Hi! I can build a Shopify custom app to fully replace your checkout, giving you complete control over payment options, UI/UX, and dynamic shipping rules. The app will integrate securely with your payment gateway, rate-shopping API, and CRM for post-purchase tagging, with a simple admin panel so non-technical staff can manage settings. I’ll provide clean, well-documented code, install/uninstall instructions, and a short video walkthrough. The custom checkout will meet Shopify compliance, handle real orders end-to-end, and maintain <300 ms third-party API latency with Lighthouse scores above 85. A demo-ready version can be delivered within three weeks. Looking forward for your positive response in the chatbox. Best Regards, Arbaz M

@Mahihassi

As a seasoned developer with a deep expertise in API integration and Node.js, I'm confident of crafting the custom Shopify checkout app you have in mind. I have built scalable backend systems, user-friendly dashboards, and robust APIs, which are crucial to your project's success. Beyond just implementing the designs, my focus on clean architecture ensures not just hassle-free toggling for your non-technical team but also an optimized and performant system even under dynamic rules. Moreover, my experience with AI-backed platforms presents an added advantage. While AI may not be explicitly required for this project, I bring the perspective of designing intelligent systems that can adapt to real-world use cases - just as you require your app to dynamically change payment options and shipping methods based on rules. This can save you time and effort in potential future adaptations.

@FizzaNadeemK

Hi, I understand you're looking for a custom Shopify app to fully replace the standard checkout, giving you control over payment options, UI design, and dynamic shipping methods while integrating with external services like payment gateways and your CRM. I can build a private Shopify app (Node or Ruby) that customizes the checkout experience to match your mock-ups, implements third-party API integrations, and provides a settings panel for easy feature toggling. I’ll ensure all customizations meet Shopify’s compliance checks, perform well under <300 ms API latency, and pass Lighthouse performance standards. Could you clarify if any specific payment gateway or CRM system is a priority for the first integration phase? I’m ready to begin and can deliver the core functionality in three weeks, with post-launch tweaks based on feedback. Best Regards, Fizza Nadeem K

@MohammedSabih

Hi, building a fully custom Shopify checkout with controlled payments, UI, and dynamic shipping—while integrating external services—is a complex task we’re very experienced with. At Talvon Technologies, with 8+ years of experience, we develop scalable Shopify apps with clean architecture and seamless integrations. ⭐ Custom Shopify app (Node/Ruby) with admin settings panel ⭐ Tailored checkout UI matching your mockups ⭐ Dynamic shipping logic + external rate APIs ⭐ Secure payment gateway & CRM integrations ⭐ Clean, documented code + install guide & walkthrough ⭐ Performance-optimized flow meeting compliance standards We’ll deliver a demo-ready core within 3 weeks and refine post-launch—let’s build this the right way together.

@Aasifayub

Hey, I just need quick clarification, for the custom checkout UI, do you have design mock-ups ready (Figma/XD) to implement, or should I work from your description? I've checked the scope and you're aiming to build a Shopify custom app that replaces the standard checkout—controlling payment options, UI, and dynamic shipping rules, with external integrations (payment gateway, rate-shopping API, CRM) and a simple settings panel for non-technical staff. I'd be glad to help you develop this using Shopify's Checkout Extensibility (if supported) or a custom checkout app with Node.js/Ruby, ensuring all third-party APIs perform reliably and the flow passes compliance. I've successfully managed similar Shopify checkout customizations with complex external integrations. Let me know your availability for a quick call on freelancer to discuss how we can move this forward. Best regards, @Asif

@TalhaAhmed02

Hi, I understand you need a fully custom Shopify checkout app that gives you complete control over payments, shipping rules, and UI, while integrating with external APIs and remaining user-friendly for your team. At TechForge Innovations, we have a 4.9 rating from 37 reviews and a 95% job success rate, with deep experience building Shopify apps that handle custom flows, API integrations, and high-performance checkout experiences. Key deliverables: • Custom Shopify App: Node or Ruby app installed in your test store with a secure, toggleable admin panel. • Checkout Flow: Fully custom UI implementing your mock-ups, conditional shipping, and alternative payment gateways. • API Integrations: Smooth, secure connectivity with your CRM, rate-shopping API, and payment provider. • Documentation & Walkthrough: Written install/uninstall guide plus a short video demo for your team. • Post-launch Tweaks: One round of adjustments based on real-store testing. Next step: I can review your mock-ups and API details, then set up a staging app in Shopify for initial testing. Estimated demo-ready delivery: within three weeks.

@mughiraaa

Hello, I have reviewed the details of your project. i can develop a custom shopify app using node.js that replaces the default checkout with your approved designs. the app will handle alternative payment gateways, dynamic shipping rules from the rate-shopping api, and crm tagging after purchase. a simple settings panel in the shopify admin will allow your staff to toggle options without code changes. all integrations will be tested for performance and reliability, and the app will be documented with installation instructions and a short video walkthrough. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira

@CodeAnchors

At the heart of a successful app lies a developer who understands the intricate layers of customization that make it truly powerful. With over 11 years of delivering web development and SaaS systems, I have honed my skills in building scalable, secure and maintainable solutions using technologies such as React.js, Node.js, Laravel and MERN stack. For your Shopify Custom Checkout App project, I bring considerable expertise in API Integration, JavaScript, Node.js, PHP and Software Architecture which is directly aligned with what your project demands. My extensive hands-on experience with Shopify ensures that your non-technical staff can seamlessly toggle the app's features without requiring any kind of coding assistance from my side. Moreover, my proficiency in crafting dashboards, portals, admin panels with custom roles and permissions will enable me to create a clean UI matching your design specifications. I understand the criticality of robust external integrations for smooth functioning of an e-commerce platform like yours; having worked on multiple resonating projects like that in the past assures you of hitting the ground running from day one. Let's build something impactful together!

@Ekarthaan

Hi Andrii H., This is quite similar to a project I delivered last week, so I can jump straight into execution. Ready to start immediately. Are you on Shopify Plus and open to Checkout Extensibility for deep UI control, or do you prefer a fully headless checkout (Hydrogen/Next) that still creates Shopify orders—this choice drives compliance and how far we can replace native checkout? For the alternative gateway, is it a Shopify Payments App/redirect flow or direct card capture via hosted fields (3DS supported), and do you have webhooks for auth/capture/refunds we can consume? Use Shopify Functions (for Plus) or a Carrier Service/Delivery Rate Provider with edge caching and prefetch to keep rate-shopping under 300 ms, with deterministic fallbacks if the API is slow. Wrap all third‑party calls with circuit breakers, timeouts, retries, and queue CRM tagging asynchronously so checkout isn’t blocked. Action Plan: - Phase 1: Architecture decision (Plus vs headless), finalize gateway/CRM/rate APIs, confirm UI spec. - Phase 2: Scaffold app (Node/TS), Polaris settings panel, feature flags/metafields. - Phase 3: Build checkout UI, payment integration, shipping rules, webhooks; secure secrets. - Phase 4: Performance hardening (caching, prefetch, circuit breakers), Lighthouse >85. - Phase 5: Staging tests, demo by week 3, docs + short video. - Phase 6: Production launch, one iteration based on live feedback. Best Regards, Sid

@revival786

Greetings! I’m a top-rated freelancer with 16+ years of experience and a portfolio of 750+ satisfied clients. I specialize in delivering high-quality, professional Shopify checkout app development services tailored to your unique needs. Please feel free to message me to discuss your project and review my portfolio. I’d love to help bring your ideas to life! Looking forward to collaborating with you! Best regards, Revival

@alizain721

If your checkout can’t show the right payment options or shipping rules at the moment of purchase you’re literally leaving money on the table. I’ve built full replacement checkouts that stop that leak and keep customers moving. The best thing about me is I’ve worked on a very similar project recently. I built a private Shopify app (Node) that replaced the standard flow, wired an alternative payment gateway, integrated a rate-shopping API for conditional shipping, and pushed post-purchase tags to a CRM, plus a simple admin settings UI for non-technical staff. I understand the user flow: cart to custom checkout screens to payment and order confirmation. System architecture would be an OAuth app with a backend webhook processor, secure API proxies to the payment gateway and rate shopper, and an admin settings panel in Shopify Admin. Key features: custom UI per your mocks, conditional shipping rules, secure third-party integrations, and staged testing with logging. Tech stack: Node/Express, Shopify APIs, webhooks, and React for the admin UI. Quick questions: Is the store on Shopify Plus so we can fully replace checkout? Are the UI mocks final and do shipping rules rely on product tags, cart values, or destination logic? If that sounds right I can demo a plan and timeline—happy to jump on a quick call. Regards Ali Zain!!

@kareemmaize

Hi there To deliver a custom checkout that controls payment options, UI, and dynamic shipping rules, the most critical part is designing it within Shopify’s checkout constraints while still achieving your required flexibility and performance. I’ll approach this by implementing a compliant architecture—using Checkout UI Extensions and Shopify Functions where possible, and integrating your external payment, rate-shopping API, and CRM through a clean Node-based app layer. This ensures the checkout remains stable, fast, and passes Shopify validation while giving you control over logic and presentation. This means I understand the real challenge here is balancing customization with compliance and performance—not just building screens. My process is simple: define the correct checkout architecture, implement UI/payment/shipping logic, then test end-to-end flows and optimize latency before launch. I’m ready to begin with architecture validation and API mapping, then deliver a working demo flow within your 3-week target..