Price
Promotional, member, and promo-code discounts are calculated consistently and only on the server.
Project 03 · Mobile Commerce
Market:
delivery with server-side pricing logic.
A mobile grocery delivery service for Kazakhstan with a catalog, Market Club, map-based addresses, checkout, and a unified operations system for the team.
- Format
- Mobile product
- Environment
- Flutter · Web · Backend
- Challenge
- Catalog, pricing, and delivery
- Nexronik role
- Architecture and development
01 / Context
Delivery is more than a storefront.
It is precise calculation and operations.
The shopper needs to see current availability, clear savings, and available delivery, while the team manages the full cycle from one operational environment.
The key challenge was to connect the mobile experience to real inventory, multiple discount mechanisms, addresses, delivery windows, payments, and support. The final price must not depend on data sent by the app.
Logistics
Cities, addresses, warehouses, inventory, and delivery windows are connected to checkout.
Operations
Catalog, orders, payments, support, and content are managed in one administration system.
02 / Solution
One product.
Three connected interfaces.
The app handles the customer journey, the API handles rules and data, and the administration panel supports the team in its daily work.
01Flutter
APP
Mobile storefront
One journey from city selection and product search to checkout and order history.
- Catalog and search
- Barcode and QR
- Map and delivery
- Profile and support
02Native PHP
API
Server-side business logic
The API is the source of truth, recalculates the cart, and applies access rules.
- Prices and discounts
- Orders and payments
- Inventory by warehouse
- Authentication and limits
03Web
OPS
Operations panel
Operational sections for managing the catalog, customers, and order fulfilment.
- Catalog and content
- Warehouses and inventory
- Orders and payments
- Reports and support
Flutter AppCustomer journey
REST APIContracts and access
Domain servicesPricing and order
MySQL + StorageData and files
03 / Capabilities
From the first search
to order completion.
Customer-facing features and operational processes run on one data model and the same server-side rules.
Catalog and search
Category hierarchy, product pages, galleries, favourites, and barcode or QR search.
Server-side pricing
The app sends the product and quantity; the backend calculates the final price and discounts.
Market Club
Membership plans, validity periods, special prices, savings history, and renewal management.
Cart and order
Promo codes, separate discount breakdowns, an address, a delivery window, and a note for the courier.
Map-based address
Point selection, geolocation, address suggestions, and city-based product availability.
Tokenized payment
A hosted session saves the payment method without exposing card details to the app.
Three languages
Russian, Kazakh, and English interfaces with translated catalog content and documents.
Operations management
Users, warehouses, orders, payments, delivery, promo codes, banners, reports, and support.
04 / Interface
Premium presentation.
Clear actions.
A dark emerald palette and gold accents unify the storefront, catalog, product page, cart, and membership flow.
The main app flows are shown: the home storefront, catalog, product page, cart, and Market Club.
05 / Reliability
Trust is built
on server-side rules.
Critical decisions stay off the client app, while integrations are isolated behind clear contracts.
Backend — the pricing source of truth
The client sends only the product identifier and quantity; the server recalculates the price.
Secure authentication
OTP requests are rate-limited by phone number and source, while token lifetimes are controlled.
Payment without card details
The app opens the provider hosted page, while the backend receives only a payment token.
Controlled operations
Critical changes go through roles, an action log, and soft deactivation of entities.
06 / Results
The result is a complete service.
From storefront to operations.
The app connects product selection, personal value, the cart, and ordering with one operational workspace for the team.
key flows shown in the case
1 unified cart
1 source of the final price
languages: Russian, Kazakh, and English
key user checks passed
images supported per product
The figures reflect the implemented product scope; sales and audience data are not disclosed.
07 / Stack
Mobile experience.
Server-side discipline.
- MobileFlutter · Dart · Provider · HTTP
- BackendNative PHP 8 · PDO · REST API
- DataMySQL / MariaDB · Local / S3 storage
- InterfaceBootstrap 5.3 · jQuery · Custom UI
- MapsOpenStreetMap · CARTO · 2GIS-ready
- QualityFlutter Test · Sentry-ready · Health checks
Need a mobile product with complex business logic?
We will connect the interface,
API, and operations.
We will design the customer journey and server-side rules so the product stays convenient for customers and manageable for the team.