Grocery E-Commerce App Build (Flutter & FastAPI/Node)

@kamran2012

Hi, I will build your grocery app in Flutter with FastAPI backend — product catalog for 10K+ items, OTP login, Razorpay + COD checkout, and an admin panel for orders and inventory management. For location-based discounts across Vapi, Daman, and Surat, I will design a discount override table keyed by location ID — keeping one product catalog while applying region-specific pricing at checkout without duplicating data. Questions: 1) Does the Oracle system expose an API, or will syncing rely on scheduled CSV exports? 2) Do you need real-time order tracking with delivery status, or basic order history? Looking forward to discussing further. Best regards, Kamran

@Srashtasoft

Hi Dear, We can build a robust and scalable solution using Flutter (Android first, iOS ready) and FastAPI or Node.js backend with a well-structured database. The app will include fast product listing, optimized search/filtering for large catalogs, smooth checkout (COD + Razorpay), OTP login, and order tracking. We will also implement location-based discount logic and seamless product sync via CSV/API from your Oracle system. The admin panel will allow order management and basic product control, and we will ensure full deployment on your server with clean, well-documented source code. A few quick questions: ================== How frequently will product data sync from Oracle (real-time, hourly, daily)? Do you need delivery slot selection or simple order placement for now? Should discounts be auto-calculated per location or manually managed via admin? Do you require multi-language support in the app? Best Regards, Srashtasoft Team

@vishal1145

Your product sync from Oracle will become a bottleneck if you're pulling 10K SKUs on every app launch. Without proper caching and delta sync, users will see 5-10 second load times, which kills conversion rates in grocery apps where speed matters. Quick question - does your Oracle system expose a REST API for real-time inventory checks, or are you planning batch CSV imports? And when you say discounts vary by location, do prices also change, or just promotional markdowns? This affects whether we cache product data locally or fetch it per session. Here's the architectural approach: - FLUTTER + RIVERPOD: Build offline-first architecture with local SQLite cache so users browse products instantly even on slow networks, syncing cart data in background. - FASTAPI + POSTGRESQL: Design normalized schema with product variants table and location-specific pricing rules, using Redis for session management and frequently accessed SKUs to handle concurrent checkouts without database locks. - RAZORPAY INTEGRATION: Implement webhook verification and payment status polling to handle network failures during checkout, preventing duplicate orders when users retry failed transactions. - ORACLE SYNC ENGINE: Build scheduled ETL pipeline that pulls delta changes every 15 minutes via CSV/API, updates only modified products, and triggers push notifications to apps when inventory drops below threshold. - ADMIN PANEL: Create React-based dashboard with bulk product editing, order fulfillment workflow, and location-based discount rules management without touching code. I've built 4 grocery apps handling 15K-50K products with real-time inventory sync. The last one scaled from 200 to 8K daily orders without performance degradation. I'll deploy everything on your server with Docker Compose and hand over full source code with zero dependencies on my accounts. Let's schedule a 20-minute call to walk through the Oracle integration requirements and confirm your server specs before I send the timeline breakdown.

@ixorawebmob

Hello, I’ve gone through your project details, and this is something I can definitely help you with. With 10+ years of experience in mobile and web app development, I specialize in Flutter and backend frameworks like FastAPI and Node.js. I focus on clean architecture and scalable solutions. Your project for a grocery e-commerce app aligns perfectly with my expertise. I can ensure a smooth implementation of features like product listings, payment integrations, and user authentication. I will first analyze your requirements, recommend the most suitable technology stack, and keep you updated throughout the development process. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify the expected timeline and any specific deployment requirements you have in mind? Let’s discuss over chat! Regards, Arpit

@Rajoriadares

Hello Client, Greeting of the day!!!! I read your job description I have sound of five years plus experience in App development. I have been DEVELOPED 35+ Apps, three taxi apps, Two socials apps and restaurant apps based on GPS location and notification functionality and based on different domain like sports, Health, GYM, personal business and social etc I have testing team for testing apps. I think I am strongest person for doing this job and provide the quality product with testing. I am always available for your support. Thanks Sr. Mobile Developer

@chandankandar007

With over a decade of professional experience to back me, I am confident that I am the best fit for your grocery e-commerce mobile app project. As a full-stack developer proficient in a variety of frameworks—including Flutter, Node.js, and FastAPI— I possess not just the technical expertise, but also the knowledge and experience necessary to build your clean UI and navigable grocery app. With regards to large data management, I have already successfully worked with product listings ranging from 8000-10000 in size similar to yours. Moreover, I have robust skills in database system management such as Oracle (for syncing products), MySQL, and MongoDB—which will undeniably be useful for your project. Perhaps what sets me apart the most is my methodical approach towards software development. From following MVC principles to adhering to logical layering and semantic naming, there's not a single line of code that goes unorganised. My aim is not only to deliver a fully-functioning app but also one that is maintainable and scalable in the long run. I would be honoured to collaborate with you on this project and promise nothing short of absolute dedication and commitment. Let's get this ball rolling!

@durgesh8527

As an experienced full-stack developer with a deep knowledge of both the front and back ends, I'm confident that I'm the perfect fit for your grocery e-commerce app project. With 12+ years in the industry, I've built clean, functional solutions that are high performing and scalable. My extensive experience includes working with large product data sets, similar to what you anticipate with the 8,000-10,000 products for your app. In terms of technology stack, I'm proficient in Flutter (Android/iOS) and comfortable with both FastAPI and Node.js for building scalable backends. You mentioned the need for a proper database design and that's an area where I have a strong track record - ensuring the underlying architecture of an application supports its immediate needs while having future scaling potential. One thing that sets me apart is my ability to think long-term; I always prioritize clean, documented code and ensure that my applications are not unduly dependent on developer accounts. Moreover, as a client-focused professional, meeting deadlines and delivering within agreed-upon budgets is something I take very seriously. So, if you're looking for an efficient developer who can provide an end-to-end solution without any hassle or compromise on quality, let's get started!

@arbu1499

Hi! I understand you need a scalable grocery e-commerce app (Flutter) with 8K–10K products, fast search/filtering, Razorpay + COD, OTP login, and a backend that syncs inventory from Oracle with location-based pricing differences. I’ve worked on similar high-volume product systems where performance, clean API architecture, and smooth UX are critical—especially with large datasets and real-time inventory sync. I’d recommend Flutter + FastAPI with PostgreSQL, optimized indexing for fast queries, and a clean admin panel for order/product control, plus full deployment support on your server with documented code. I can share relevant work, timeline, and cost breakdown—happy to collaborate long-term. Looking forward for your positive response in the chatbox. Best Regards, Arbaz N

@fullstack0407

I have read your job post and understand that you’re looking to build a scalable grocery e-commerce mobile app with a strong backend foundation, not just a basic MVP. My approach would be to develop a clean, high-performance Flutter app (Android first) with a UI inspired by platforms like DMart/JioMart focused on fast browsing, smooth search, and frictionless checkout. On the backend, I recommend FastAPI for its speed and scalability, combined with PostgreSQL for structured product and order data. I’ll design the system to efficiently handle 10K+ products with optimized indexing, caching, and pagination. Product data will be synced from Oracle via scheduled API/CSV ingestion pipelines, ensuring consistency. Location-based pricing will be handled via a flexible pricing layer, where base products remain constant but discounts dynamically adjust per city (Vapi, Daman, Surat). I’ve worked on similar multi-vendor and high-volume catalog systems where performance, clean architecture, and real-time updates were critical. The platform will include OTP-based authentication, Razorpay integration, COD support, order tracking, and a robust admin panel for managing orders and inventory.

@webmasters486

Greetings! My name is Muhammad, and I am a highly skilled and dependable freelancer with a team of competent developers who can help you transform your grocery e-commerce idea into a cutting-edge mobile app. Our primary focus is on ensuring superior user experience, and we have substantial proficiency in both Flutter for the Android app development and in FastAPI or Node.js for your backend architecture. In terms of managing large product data such as the 8,000-10,000 products you have mentioned, we possess the necessary expertise to ensure smooth navigation, efficient search options, filters, categorizations as well as prompt cart and checkout functionalities. Furthermore, we have worked with multiple payment gateways like Razorpay and OTP login functionalities. Considering the demanding nature of this project, our collaborative approach and our long-term commitment to our clients' success make us an ideal choice for you. We promise well-documented, clean code base that will be fully deployable on your server without needing any developer accounts thereby ensuring complete ownership and control over your application at all times. With us, you don't just get a product, you get a dedicated partner. Reach out to ¡n me at your earliest convenience!

@NEHABHAT92

With nearly a decade of experience in both web and mobile app development, I am confident that I can bring your grocery e-commerce app vision to life. My team and I are well-versed in the technologies required for this project - from Android and Flutter, to Node.js - and have successfully built complex, high-functioning apps in similar domains. We are well-equipped to handle a large product data of 10K+ and possess a thorough understanding of clean database design and API-based architecture. In addition to technical expertise, we understand the importance of usability and aesthetics in an e-commerce app. Our designs will resonate with the clean UI requirements and offer features like search, categories, filters, OTP login, cart & checkout, order history & tracking - among others that you've specified - effortlessly. Moreover, being skilled in backend development using FastAPI – or Node.js as per need – we can guarantee a scalable architecture with easy integrations including an admin panel for orders & basic product management. Lastly, I assure you timely delivery without any compromise on quality. We take pride in our coding ethics which will ensure clean and documented code. Transparency is paramount for us; thus, we'll provide you with full source code ownership without dependency on our developer accounts. Even after the project is delivered, you'll get free 3 months of support from us.

@webnsoftindia

-------- Grocery E-Commerce Mobile App (Flutter + Scalable Backend) ----------- Hello, We will build a full-featured grocery e-commerce mobile application with a scalable backend system designed to handle large product catalogs (10,000+ items), multi-location pricing rules, and seamless order processing. The solution will be production-ready, cleanly structured, and optimized for long-term scalability and maintainability. We will use Flutter for the mobile app (Android first, iOS later) and FastAPI (or Node.js if preferred) for the backend, ensuring high performance, clean API architecture, and easy integration with your Oracle inventory system. Key features include: OTP-based user authentication Grocery-style UI (DMart / JioMart inspired design) Product listing with 8,000–10,000 SKUs Advanced search, categories, and filters Cart, checkout, and order management system COD + Razorpay payment integration Order history and live tracking Location-based pricing rules (same products, variable discounts) Inventory sync via API or CSV import (Oracle integration ready) Admin panel for product and order management Scalable REST API backend architecture Full deployment support on your server APK build delivery for Android Thanks

@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

@hr157

Hello, I can build your grocery e-commerce app with a scalable architecture and smooth user experience. Tech Stack: Flutter (Android first), FastAPI (Python), PostgreSQL + Redis, REST APIs. Experience: Built large-scale catalog apps handling 10K+ products with fast search, filters, and optimized APIs. Features: OTP login, Razorpay + COD, order tracking, admin panel, Oracle sync (CSV/API), and location-based discount logic. Timeline: 4–6 weeks Cost: ₹1.2L–₹2.5L (based on final scope) Deployment: Yes, full server deployment, APK build, and complete source code with documentation included. I’m available for long-term collaboration and ongoing improvements.

@RajAbhisek

Hello, I saw your requirement for a grocery e-commerce app with Flutter and FastAPI/Node. It sounds like a perfect fit for us. I'm Raj Abhisek Panda, and I have solid experience building scalable e-commerce solutions, including those with large product catalogs (10,000+ items). We can definitely build your mobile app using Flutter for Android (and later iOS) with a clean UI similar to DMart/JioMart. Features like OTP login, COD, Razorpay, and robust search/filters are all part of our expertise. For the backend, we will use FastAPI (Python) as it's excellent for API-driven architectures and managing things like location-based discounts and product sync from Oracle via CSV/API. Yes, we are experienced with large product data and will ensure smooth performance. We can also handle full deployment on your server and provide all source code and the app APK. We'd be happy to share similar app demos when we connect on chat. Ping us on chat, we can definitely do this project. Raj Abhisek Panda

@chiragardeshna

Hi there, Strong alignment with this project comes from experience delivering large-scale e-commerce apps where performance, scalability, and clean architecture were critical. Clear understanding of your requirement to build a Flutter-based grocery app with 8K–10K products, backend (FastAPI/Node), Razorpay integration, OTP login, and location-based pricing logic. Hands-on expertise with Flutter, API-driven backends, and database optimization ensures smooth handling of large product catalogs, fast search, and stable checkout flows. Risk stays controlled through scalable architecture, efficient product syncing (CSV/API), and ensuring clean, maintainable code with full ownership. Answers: • Similar apps: Can share grocery/e-commerce demos on request • Tech stack: Flutter (mobile) + FastAPI (backend) + PostgreSQL + Redis (for caching/search speed) • Experience with large data: Yes, handled 10K+ products with optimized queries and indexing • Timeline: ~4–6 weeks for MVP • Cost: Can be finalized after scope discussion • Deployment: Yes, full deployment + APK build + handover included Available to start immediately happy to discuss roadmap and long-term collaboration. Recent work: https://www.freelancer.com/u/chiragardeshna Regards Chirag

@KarthikTechCon

Hi, I’m Karthik with 15+ years of experience in mobile app development and UI/UX optimization. I’ve worked on Flutter apps integrated with PHP (CodeIgniter) backends, ensuring smooth upgrades without breaking APIs. **Approach:** • Audit existing Flutter code + API integrations to identify safe UI upgrade paths • Revamp UI with modern color palette, typography, and consistent design system • Enhance interactions (smooth animations, better tap feedback, improved responsiveness) • Ensure seamless compatibility with your PHP CI + MySQL backend **Feature Enhancements:** • Analyze your ideas, propose scalable implementations • Clean integration with existing APIs (no backend disruption) • Maintain performance and app stability **Quality & Deployment:** • Full regression testing (UI + API endpoints) • Device testing across Android versions • Deploy to Google Play internal track → support final release rollout **Potential Pitfalls (Handled):** • API dependency mismatches → handled via adapter layers • UI changes affecting state management → structured refactor • Performance drops → optimized animations & rebuilds **Timeline:** 1–2 weeks (UI) + features based on scope **Cost:** $400 – $1,000 I focus on clean UI, stability, and smooth user experience. Warm Regards, Karthik B Resonite Tech

@abdf2010

Hello, I am interested in your project, Grocery E-Commerce App Build (Flutter & project. I've successfully completed projects involving Mobile App Development, Android, NoSQL Couch & Mongo before. Happy to discuss the details whenever works for you.

@arshig8

Hello, I have carefully reviewed your project requirements and understand you are seeking a reliable professional who can deliver a well-planned, high-quality digital solution with clarity, commitment, and long-term value. I am a full-stack developer and digital solution consultant with 4+ years of freelance experience, passionate about building scalable, user-friendly, and business-oriented web and mobile applications. My work approach is structured and transparent, ensuring the final output aligns exactly with the client’s expectations. Why I’m a strong fit for your project: Hands-on experience in MERN Stack, PHP, Laravel, HTML, WordPress, Shopify, and modern UI design. Application development for Android and IOS in Flutter Strong background in website design, graphics, and customer-centric interfaces Proven ability to manage projects end-to-end, from planning and development to deployment and support Experience working with clients who value quality, timelines, and clear communication I focus on clean code, intuitive design, and performance optimization, ensuring the solution is reliable, secure, and easily scalable. I believe in honest commitments, realistic timelines, and delivering exactly what is promised. I want to discuss your goals further and clarify any details needed before moving ahead. Thank you for your time and consideration. Looking forward to the opportunity to work together. Best regards, Arshiya