{"id":5929,"date":"2026-06-12T06:51:01","date_gmt":"2026-06-12T04:51:01","guid":{"rendered":"https:\/\/uniquedevs.com\/case-study\/wieloplatformowa-aplikacja-marketplace\/"},"modified":"2026-06-12T13:07:57","modified_gmt":"2026-06-12T11:07:57","slug":"cross-platform-marketplace-app","status":"publish","type":"case-studies","link":"https:\/\/uniquedevs.com\/en\/case-study\/cross-platform-marketplace-app\/","title":{"rendered":"Cross-Platform Marketplace App"},"content":{"rendered":"\r\n
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The marketplace app is a modern, multi-platform ecosystem designed for local trade and distribution of natural products. The project seamlessly integrates a dedicated mobile app for buyers and sellers, a self-service web panel for sellers, an administrative panel, and a high-performance backend API based on the GraphQL standard.<\/p>\n

The product\u2019s main value lies in bridging the gap between local producers and consumers.<\/p>\n <\/div>\r\n <\/div>\r\n

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Users can discover local stores in real time on an interactive map, browse the product selection, place orders with delivery or in-store pickup options, and rate products.<\/p>\n

Sellers are provided with intuitive tools to run their own online stores and manage subscriptions, while administrators retain full operational oversight of the entire ecosystem.<\/p>\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n

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\r\n Market context and business challenges<\/span> <\/h2>\r\n
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The market for local, natural products can be highly fragmented. End customers often know what products they are looking for, but they lack a centralized source of information on where a specific producer or store is located in their immediate vicinity.<\/p>\n <\/div>\r\n <\/div>\r\n

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On the other hand, smaller retailers and artisans need a simple, technology-friendly way to showcase their products, build visibility, and accept orders\u2014without having to go through the costly process of building a dedicated online store from scratch.<\/p>\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n

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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Discovering suppliers in the map-first model<\/strong>\r\nCombining a digital product catalog with the actual, physical location of a point of sale. <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Support for three user groups<\/strong>\r\nDesign and maintain a single, consistent data model for buyers, sellers, and administrators. <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Scalable Monetization<\/strong>\r\nIntroduction of an automated subscription model that directly controls the visibility of sellers’ commercial offers. <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Centralization of operations<\/strong>\r\nProviding tools for mass communication, payment processing, and access management. <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n
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\r\n Main project objectives<\/span> <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n For Buyers<\/strong>\r\nQuick and intuitive search for local products and interactive mapping of nearby sellers. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n For sellers<\/strong>\r\nAccess to a self-service dashboard for instantly creating a store profile, adding products, and managing orders. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Business<\/strong>\r\nDeveloping a mechanism for automatically controlling product visibility based on subscription payment status. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Technology<\/strong>\r\nMaintaining a single, unified data contract (API) for the mobile app and both management dashboards. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n For Buyers<\/strong>\r\nQuick and intuitive search for local products and interactive mapping of nearby sellers. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n For sellers<\/strong>\r\nAccess to a self-service dashboard for instantly creating a store profile, adding products, and managing orders. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Business<\/strong>\r\nDeveloping a mechanism for automatically controlling product visibility based on subscription payment status. <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Technology<\/strong>\r\nMaintaining a single, unified data contract (API) for the mobile app and both management dashboards. <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n
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\r\n WE’RE ONLINE <\/div>\r\n \r\n
\r\n Do you have a similar project<\/span> in mind? <\/div>\r\n \r\n
\r\n A quick chat<\/strong> usually cuts weeks of indecision<\/strong> down to just a few minutes. Tell us what you want to build\u2014we\u2019ll give you concrete answers, without any sales talk. <\/div>\r\n \r\n
\r\n \r\n \r\n \r\n <\/svg>\r\n +48 602 393 343 <\/a>\r\n \r\n \r\n \r\n \r\n \r\n <\/svg>\r\n Prefer online? Schedule a consultation <\/a>\r\n <\/div>\r\n <\/div>\r\n\r\n
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\r\n \"\"\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\n
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\r\n Ecosystem Architecture and User Flows<\/span> <\/div>\r\n
\r\n The website featured a complete set of global settings in the WordPress admin panel, which greatly simplified site management. Among the most important global settings were: <\/div>\r\n <\/div>\r\n
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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Seller – mobile app + web dashboard<\/span><\/strong>\r\n

The seller gains flexibility\u2014they can manage their business on a phone or computer.<\/p>\r\n

Launching an online store<\/p>\r\n

After registration, they provide an address, which the system automatically converts into geographic coordinates using integration with the Google Geocoding API.<\/p>\r\n

Catalog management<\/p>\r\n

The seller sets net\/gross prices, assigns categories, and uploads photos (which the system automatically compresses). The number of products that can be marked as \u201cvisible\u201d to buyers is dynamically adjusted based on the purchased plan.<\/p> <\/div>\r\n <\/div>\r\n

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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Buyer – mobile app<\/span><\/strong>\r\n

The mobile app for end customers focuses on location.<\/p>\r\n

Purchase path<\/p>\r\n

The interface starts with a map view that uses advanced marker clustering (ensuring the screen remains clear even when points are densely packed). The buyer searches for a product or store, clicks a marker, and goes to the offer details. They see a gallery of up to 3 photos, the gross price, delivery options, and ratings. They add items to the cart and place an order.<\/p>\r\n

Cart grouping<\/p>\r\n

The cart automatically groups products by specific store, which eliminates the logistical problem of a single order split across multiple uncoordinated suppliers.<\/p>\r\n

Review mechanism<\/p>\r\n

After purchase, the user can rate the product from the order history, which automatically updates the average rating and builds transparency on the platform.<\/p> <\/div>\r\n <\/div>\r\n

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\r\n \"Ikona\"\r\n <\/div>\r\n \r\n
\r\n Administrator \u2013 web panel<\/span><\/strong>\r\n

A dedicated environment for internal marketplace management. It allows you to filter the user database and view transactions and order history. Additionally, it enables the scheduling and bulk sending of email notifications, which the backend processes periodically in batches to prevent overloading the mail server.\r\n<\/p> <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n

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\r\n Website architecture <\/div>\r\n
\r\n The project stands out for its modern, fully modular, and performance-oriented technology stack: <\/div>\r\n <\/div>\r\n
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\r\n Frontend <\/div>\r\n
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\r\n Mobile App (Expo \/ React Native) <\/div>\r\n
\r\n It uses expo-router<\/span> for navigation and NativeWind for consistent interface styling. The shopping cart is saved and processed locally using AsyncStorage<\/span> <\/div>\r\n <\/div>\r\n <\/div>\r\n
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\r\n Web Panels (React \/ Vite \/ Tailwind) <\/div>\r\n
\r\n Both the seller and administrator dashboards are lightweight SPA applications. They use the nuqs<\/span> tool to efficiently synchronize and store filter states directly within the URL structure. <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n
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Backend NestJS & GraphQL<\/b><\/h3>\n

Built using the NestJS framework.<\/p>\n

It provides a single GraphQL API via Apollo, which serves as a common data contract for the mobile app, the merchant website, and the admin panel. The data layer uses Prisma ORM<\/b> and a PostgreSQL database, ensuring transactional operations (which are critical for processing payments and orders).<\/p>\n <\/div>\r\n <\/div>\r\n <\/div>\r\n <\/div>\r\n<\/section>\n\n\r\n

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Key Design Decisions and Conclusions for the Case Study<\/h3>\n

Immutability of Order History<\/h4>\n

When a purchase is finalized, the system saves a complete copy (snapshot) of the product data (name, price, taxes) from the exact moment of purchase. This ensures that subsequent edits to the product lineup or prices made by the seller do not negatively impact the historical order records of the buyer and administrator.<\/p>\n

Monetization automation (RevenueCat)<\/h4>\n

Subscription support in the mobile app has been integrated with RevenueCat. The backend processes webhooks regarding purchases, renewals, or package expirations in real time. In the event of a downgrade, the system automatically hides redundant products, ensuring the integrity of the business model.<\/p>\n

Security and compliance with privacy policies<\/h4>\n

The system operates on a soft delete mechanism (business records are not physically deleted from the database). When an account is deleted, user data is fully anonymized and associated store and product structures are hidden, which protects the integrity of the database.<\/p>\n <\/div>\r\n <\/div>\r\n

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\r\n Potential<\/span> business outcomes <\/div>\r\n \r\n
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