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Project Overview We are seeking an experienced full-stack engineering team to develop and deploy a high-performance, responsive global web application and utility platform. The entire frontend must be built from scratch using clean, semantic React.js and Tailwind CSS, supported by a robust, secure Node.js and [login to view URL] backend architecture. This project enforces a strict Zero-Plugin / Zero-Template Policy. All performance optimization, state management, and asset delivery must be engineered natively within the codebase to guarantee uncompromised speed and stability. Core Scope of Work & Functional Requirements 1. Frontend UI Execution (React.js & Tailwind CSS): o Development of an 8-page fully responsive architecture using fluid typography and strict grid alignments. o Integration of dynamic client-facing components, including interactive resource-scaling sliders and multi-input cost estimation forms. o Implementation of native dark-mode styling utilizing specific, predefined design tokens and hex codes. 2. Backend Architecture & APIs (Node.js & [login to view URL]): o Development of an automated Geolocation IP filtering mechanism to handle regional user categorization. o Integration of dynamic calculation engines to process multi-input form variables and output real-time structural cost matrices. o Deployment of an isolated lead qualification layer that captures and routes communication data via external webhooks without bottlenecking public core application routes. 3. Payment & Deployment Gateways: o Full integration of dual-currency payment gateway APIs (Stripe and domestic localized checkout hooks) to handle single-pass transaction processing and secure checkout callbacks. o Secure deployment preparation on cloud container pools with streamlined version control. Strict Performance Benchmarks • The production application must achieve a native Mobile Core Web Vitals Largest Contentful Paint (LCP) 1.2 seconds. • Target Mobile PageSpeed score must consistently benchmark at 95+ across Chrome, Safari, Firefox, and Edge browser engines without relying on third-party optimization libraries or plugins. Collaboration & Compliance Onboarding Workflow To protect proprietary data, structural logic, and system infrastructure parameters, our development roadmap utilizes a strict compliance gate: • Step 1: Scope & Estimate Confirmation: Review these functional guidelines and confirm your fixed budget alignment. • Step 2: Formal Mutual NDA Generation: Provide the full legal names of your lead developer and participating team engineers. A formal Mutual NDA will be generated and dispatched via email. • Step 3: Technical Handoff: Upon receipt of the executed agreement, Milestone 1 will be funded, and your team's GitHub handles will be whitelisted for access to our private organization monorepo containing detailed wireframes, architecture blueprints, and API documentation.
Project ID: 40544271
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212 freelancers are bidding on average $490 USD for this job

With over a decade of experience in full-stack architecture and high-scale systems, I understand your project goal of developing and deploying a high-performance, responsive global web application and utility platform using MERN / React & Node.js. My background in scaling for over 1 million users and experience in creating high-security systems in FinTech directly apply to the challenges of your project. For strategic insight, I recommend focusing on native performance optimization within the codebase to ensure speed and stability. In a past project, I successfully built and scaled a Telegram Mini App serving over 1 million users, showcasing my ability to handle complex and high-performance applications. I encourage you to reach out to discuss the roadmap further. Let's collaborate to bring your vision to life and achieve the strict performance benchmarks you are aiming for.
$600 USD in 20 days
8.3
8.3

Hi, I've built MERN stacks like this many times—full deployment included. I noticed your project description got cut off, but I can see you need React and Node.js working together, and that's exactly what we do. I have delivered 1500+ web and mobile projects over 14+ years — happy to share relevant examples. Send over the full details and let's get moving. Thanks, Hasan
$250 USD in 21 days
7.6
7.6

Hello,Please send the NDA copy to sign it , I am a honest dedicated full time MERN / React & Node.js developer. I read your requirements carefully and understood very well about the project scope and start working accordingly in stages. I am having more then 11+ years of experienced in programming and i believe that i can start working step by step and achieve the project goal in short time frame. successfully implement this project from start-to-finish. Let's come together and create a platform that not only propels your business but also stands out prominently within the marketplace. Thanks
$250 USD in 7 days
6.9
6.9

Hi — your zero-plugin/zero-template policy is exactly how we prefer to build. I'd hand-engineer the frontend in semantic React + Tailwind (no UI kits), with a secure Node/Express API, custom state management, and performance tuned natively (code-splitting, asset delivery, caching) rather than bolted on. We've delivered scratch-built React/Node platforms for SaaS products like EloERP and FOXAF. I can deploy to your target host with CI and Lighthouse-grade performance budgets. — Muhammad Idrees / Global IT Vision Pvt. Ltd
$700 USD in 21 days
7.3
7.3

Hi there! I'm Markiyan, a full stack developer and CEO of a web agency, and I'd love to help you build this high-performance web application. I understand you need a responsive global web application with a React.js frontend and a Node.js backend, following a strict Zero-Plugin policy, which means all performance optimization and state management must be engineered natively. My team and I have experience with similar projects, including a music voting mobile app built with React Native and Node.js, and we're confident in our ability to deliver a fast and stable application. I can deliver a fully functional web application that meets your requirements, including an 8-page responsive architecture, dynamic client-facing components, and a robust backend with automated Geolocation IP filtering and dynamic calculation engines. One question: can you provide more details about the dual-currency payment gateway APIs and the expected transaction volume? Feel free to message me to discuss the details! — Markiyan
$520 USD in 10 days
6.9
6.9

As a seasoned development team led by me, SUNIL, we excel at delivering top-of-the-line, scalable solutions essential to bring your ambitious web application project to life. For over 12 years, we've crafted powerful software using standout technologies like JavaScript and our proficiency lies in languages like TypeScript and frameworks like Node.js and React.js - precisely what you demand. We also keep up with the latest trends that your project demands, such as working with Tailwind CSS and Express.js. With this deep experience under our belt, we've tackled the kind of performance optimization, state management, and asset delivery native to your codebase preference.
$250 USD in 7 days
6.6
6.6

Hi there, I can help you with this full-stack MERN application. The zero-plugin policy and the strict performance benchmarks for 95+ PageSpeed and 1.2s LCP are exactly the kind of constraints I work with. I build everything natively in React with custom hooks and lazy loading, and the backend with Express middleware for geolocation and webhook routing. I'm Edward, a solo developer with 10+ years experience. Happy to chat more about this.
$250 USD in 7 days
6.7
6.7

Hi, I can help build this as a custom React/Tailwind + Node/Express application, with no templates or plugin-based shortcuts. The scope is clear: responsive 8-page frontend, dark-mode tokens, custom sliders/forms, geolocation handling, calculation engines, lead routing via webhooks, payment integration, and cloud-ready deployment. For performance, I’d approach this from the architecture level: lean React components, careful asset loading, server-side/API efficiency, image optimization, minimal client-side JavaScript where possible, structured caching, clean Tailwind output, and early Lighthouse/Core Web Vitals checks during development rather than only at the end. On the backend, I’d separate public app routes, calculator logic, lead qualification, payment callbacks, and webhook handling so one layer does not slow down the rest of the platform. Stripe and the localized checkout flow would also be handled with secure callback validation and clear transaction status tracking. Regarding the NDA, I’m comfortable reviewing and signing before accessing private wireframes, API docs, or infrastructure details. Once the agreement is in place, I can share the required developer details and GitHub handle for repository access. Question 1: Do you already have the 8 page wireframes finalized, or should frontend structure refinement be included in Milestone 1? Question 2: Which domestic/localized checkout provider should be integrated alongside Stripe? Regards, Houssame
$500 USD in 7 days
6.2
6.2

Hey, the LCP under 1.2s without third-party optimization libs is the part that'll actually define how this gets built — that constraint pushes you toward static asset pre-rendering, aggressive code splitting, and careful font/image loading strategies baked into the React layer itself rather than bolted on. I'd handle the IP geolocation at the Express middleware level so it resolves before any route logic touches it, keeping the core app routes clean from the lead qualification layer. The dual-currency Stripe integration with localized checkout hooks is where scope tends to creep quietly, especially around webhook idempotency under retry conditions — that's a detail I plan for upfront. Are the 8 pages mostly static content with dynamic components, or are several of them heavily data-driven from the backend calculation engine?
$250 USD in 6 days
5.7
5.7

As an punctual, skilled multidisciplinary Web developer and Server Administrator, I am equipped to efficiently solve your Wordpress theme design problems. Over the years, I've gained comprehensive experience in all aspects of Design, Development and Maintenance of Websites including HTML, CSS and PHP which are central to WordPress troubleshooting. With a results-oriented approach, my main objective is always to ensure client satisfaction and measurable success in line with SEO best practices. Regarding communication, I understand how important it is to keep you consistently informed about the project's progress. Offering instant messaging through platforms like Slack or Discord isn't a problem at all. In fact, I believe this real-time interaction will be particularly beneficial in tackling your theme design modifications efficiently. Moreover, as someone with proven skills in investigating, diagnosing and troubleshooting both Linux and Windows Servers, you can trust that I have the problem-solving prowess required for your job. I will meticulously examine every component contributing to this issue guaranteeing that necessary measures are taken to prevent its reoccurrence. Future-proof your site by entrusting me with this task--you definitely won't be disappointed!
$500 USD in 10 days
5.8
5.8

Hello, We've reviewed your requirements in detail and are confident our team can deliver this project with a clean, scalable architecture while meeting your zero-plugin policy and performance benchmarks. We're aligned with your onboarding process. Please share your expected fixed budget range so we can confirm commercial alignment. Once agreed, we'll proceed with the Mutual NDA and provide our lead developer and engineering team details for GitHub access and project kickoff. Best Regards, Zero IT Solution
$1,000 USD in 25 days
6.1
6.1

What stands out here is that you're not looking for a typical MERN build—you've already identified performance as a product requirement, which changes a lot of implementation decisions from day one. I’d start by building the React/Tailwind frontend architecture from scratch with the design token system and dark mode baked in, then wire the calculation flows and resource-scaling components before connecting them to the backend engines. On the Node/Express side, I’d keep the geolocation layer, calculation services, lead-routing pipeline, and payment processing isolated so failures in one area never impact public-facing routes. For a project targeting 95+ mobile PageSpeed and ~1.2s LCP, asset delivery, route-level code splitting, caching strategy, hydration cost, and API response times need to be engineered early rather than optimized later. I've done similar performance-focused work on Zipline using React, Tailwind, and custom UI interactions where speed remained a primary requirement throughout development. One thing I'd also add is graceful fallback handling for geolocation, payment callbacks, and webhook failures so lead capture never gets lost even when third-party services are temporarily unavailable. I can start reviewing the technical handoff process immediately.
$500 USD in 7 days
5.3
5.3

Hi, you need an engineering build where frontend performance, backend computation, and payment reliability are all treated as one system rather than separate layers stitched together after the fact. At your scale of requirements—React + Tailwind frontend, Node/Express backend, real-time calculation engines, IP-based routing, and dual payment flows—the main risk is not implementation but architectural drift that breaks Core Web Vitals targets under real traffic. I would structure this as a clean React architecture with strict component boundaries, server-side calculation endpoints for the cost matrix engine, and isolated webhook-driven lead routing so checkout and lead capture never compete on the same execution path. On the backend side, I’d implement lightweight geolocation filtering and payment callback handling with careful separation of concerns so Stripe and local gateway flows remain idempotent and audit-safe while keeping response times consistently low. Before anything else, can you share whether your cost calculation engine already has a defined formula spec, or does that logic still need to be designed from scratch? Best regards, Fizza Nadeem K
$250 USD in 5 days
5.4
5.4

You nailed the performance targets. Hitting LCP 1.2s and 95+ mobile PageSpeed without plugins means we must control every byte and render step from React to the container. That usually means shipping minimal critical CSS, client side code splitting, and pushing heavy calculation to an isolated backend worker so the UI stays snappy. I built TicketSALO, a Stripe integrated ticketing SaaS where we engineered fast client UX and PCI compliant payments under strict performance constraints. My approach 1. Frontend: build a React app with Tailwind from scratch, create eight responsive pages, native dark mode with your tokens, and client components for sliders and multi input forms with local state and memoization. 2. Backend: Node and Express APIs, middleware for geolocation IP filtering, a calculation engine service for real time cost matrices, and an isolated lead qualification webhook worker. 3. Payments and deploy: Stripe plus domestic checkout hooks integration, containerize with Docker and orchestrate for zero downtime. Native performance steps include critical CSS extraction, image responsive srcsets, and server side rendering where needed. Budget and compliance I confirm the fixed budget alignment at 500 USD. I will provide the full legal name of the lead and GitHub handles after the Mutual NDA is issued. Quick question before I draft an architecture diagram and performance plan for Milestone 1: which domestic payment provider hooks do you need supported and which target regions should the geolocation rules prioritize?
$500 USD in 7 days
4.8
4.8

Hello There!!! ★★★★ (Custom MERN application built from scratch with zero plugins, high performance, and secure cloud-ready architecture.) ★★★★ I carefully read your project and understand you need a fully custom React, Tailwind, Node.js, and Express application built under a strict Zero-Plugin policy. I can confirm my budget alignment and am comfortable proceeding with the NDA process and GitHub-based development workflow. ⚜ Custom React & Tailwind Frontend ⚜ Node.js & Express Backend ⚜ REST API Development ⚜ Stripe & Payment Integration ⚜ Performance Optimization ⚜ Cloud Deployment & GitHub Workflow ⚜ Secure Scalable MERN Architecture I have experience developing high-performance MERN applications from scratch with clean architecture, optimized Core Web Vitals, and scalable backend systems. I'll build semantic React components, efficient APIs, native state management, secure payment flows, and container-ready deployment while maintaining clean, documented code throughout. I'd love to discuss the project roadmap and begin as soon as the NDA is in place. Warm Regards, Farhin B.
$256 USD in 10 days
5.0
5.0

⚠️ If you're not happy, you don’t pay. ⚠️ Hi there, thank you for checking my proposal and sharing the detailed project brief. I can build your high-performance, responsive web application using React.js and Tailwind CSS with a focus on speed and stability. I will deliver: • Fully responsive 8-page architecture with interactive components • Implementation of native dark mode styling • Automated geolocation IP filtering and dynamic calculation engines • Dual-currency payment gateway integration • Strict performance benchmarks for Mobile Core Web Vitals and PageSpeed You will also receive streamlined deployment preparation and secure documentation. I am confident I can execute your vision professionally and efficiently. Looking forward to discussing timeline and next steps. Best regards, Chirag.
$550 USD in 7 days
4.4
4.4

I am 100% confident in building your high-performance MERN application from scratch, adhering strictly to your zero-plugin and native optimization requirements. I specialize in semantic React/Tailwind architecture and secure Node/Express backends, ensuring your mobile LCP remains under 1.2s with a 95+ PageSpeed score. My approach prioritizes native state management and efficient asset delivery, eliminating third-party bloat while maintaining a robust lead routing and payment integration layer. I am ready to sign the NDA immediately and begin the technical handoff for the private monorepo. To achieve the targeted LCP, are you planning to host the containerized application on a managed Kubernetes cluster or a serverless environment like AWS Fargate/Cloud Run?
$500 USD in 4 days
4.5
4.5

hi.. we have strong experience in react, node js, express and tailwind css and we build high performance web applications with clean architecture and scalable backend systems. we can develop your platform from scratch with a custom react frontend and a secure node js backend. we will handle api development, calculation logic, geolocation filtering and payment integration while keeping performance as a top priority. can we schedule a quick call to discuss the project in detail. it will help us understand your technical requirements better and give you a clear plan for architecture, timeline and budget. we will also share our portfolio. mughira
$500 USD in 7 days
4.5
4.5

With over a decade of experience in full-stack web development using technologies like Node.js, React.js, and Tailwind CSS, I am confident in my ability to deliver a secure, high-performance web application that aligns with your exact requirements. I strictly adhere to your Zero-Plugin/Zero-Template Policy, guaranteeing an optimized application without relying on unnecessary third-party libraries or plugins. My expertise goes beyond mere coding; it extends to performance optimization, state management, and asset delivery. I can assure you an uncompromised speed and stability in the frontend as well as backend. My proficiency in carrying out tasks like Geolocation IP filtering mechanism, dynamic calculation engines, payment gateway integrations and much more will ensure no stone is left unturned in your project's success. Additionally, my collaboration mantra involves understanding your business objectives clearly and delivering tailor-made solutions that drive user engagement while being scalable for future growth. Should you decide to collaborate with me and my team, expect a deep understanding of your needs with minimal back-and-forth communication, clean and maintainable code, timely delivery without compromising quality, and consistent support during the project lifecycle. Let's create something phenomenal together!
$250 USD in 7 days
4.4
4.4

Hello, I'm excited to offer my expertise in developing and deploying high-performance web applications using the MERN stack. I understand the importance of a clean, efficient codebase and am ready to tackle the challenges your project presents. Key Points: - I will develop a fully responsive frontend with dynamic components and native dark-mode styling. - I'll create a robust backend architecture with automated geolocation filtering and dynamic calculation engines. - Integration of dual-currency payment gateways and secure deployment on cloud container pools will be seamless. My experience in developing similar projects and my commitment to meeting strict performance benchmarks make me the ideal candidate for this project. I look forward to discussing how we can work together to bring your vision to life.
$250 USD in 7 days
4.3
4.3

Kigali, Rwanda
Member since Jun 26, 2026
£10-15 GBP / hour
$750-1500 USD
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$10-30 USD
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₹12500-37500 INR
₹12500-37500 INR
$750-1500 USD
$10-30 USD
£250-750 GBP
$3000-5000 SGD
₹1500-12500 INR
€8-30 EUR