E-commerce developmentE-Commerce App Development
A website for your business that takes orders and payments. App369 builds custom e-commerce platforms and mobile shopping apps with Shopify integration, Stripe payments, and conversion-optimized checkout flows that turn browsers into buyers.
- Fiverr
- 5.0 · 126 reviews
- Own product
- Workspace369
- Fixed-price offers from
- $450
What we build
E-Commerce Development Services
01
Custom E-Commerce Platforms
Fully custom e-commerce solutions built with modern frameworks and headless architecture. We build product catalogs, checkout flows, and admin dashboards tailored to your business model, from direct-to-consumer brands to multi-vendor marketplaces.
02
Shopify Customization
We build custom Shopify themes, private apps, and headless storefronts using the Storefront API for brands that want Shopify's backend reliability with a fully custom frontend experience.
03
Payment Gateway Integration
PCI DSS compliant payment integration with Stripe, PayPal, Apple Pay, Google Pay, and regional payment methods. We implement 3D Secure for fraud prevention.
04
Inventory Management Systems
Real-time inventory tracking across multiple warehouses and sales channels with automated low-stock alerts, purchase order generation, and barcode/SKU management. Our systems sync with Shopify, Amazon, and custom fulfillment providers.
05
Order Fulfillment Systems
Automated order processing from purchase to delivery with real-time tracking, shipping label generation via ShipStation or EasyPost, returns management, and customer notification emails at every stage of the fulfillment pipeline.
06
Analytics & Conversion Dashboards
Custom analytics dashboards tracking revenue, conversion rates, average order value, customer lifetime value, and product performance. We integrate Google Analytics 4, Mixpanel, and custom event tracking to identify optimization opportunities.
How it works
Our process
Market Research & Strategy
We analyze your target market, competitors, and revenue model to define the optimal e-commerce architecture, whether Shopify, headless commerce, or fully custom, along with payment, shipping, and inventory requirements.
UX Design & Conversion Optimization
Simon designs conversion-optimized shopping experiences with intuitive product browsing, streamlined checkout flows, and mobile-first responsive design validated through user testing.
Platform Development
Simon builds your e-commerce platform with product catalog management, payment integration, real-time inventory tracking, order management, and Algolia-powered search with faceted filtering.
Testing & Security Audit
Comprehensive testing including payment flow testing with Stripe test mode, load testing for traffic spikes, PCI DSS compliance verification, and cross-browser/cross-device QA.
Launch & Marketing Setup
We deploy your store, configure analytics and conversion tracking, set up email marketing automation for abandoned cart recovery, and integrate with social commerce channels.
Growth Optimization
Ongoing A/B testing of checkout flows, product page optimization based on analytics, inventory system scaling, new payment method integration, and feature additions driven by customer behavior data.
Technologies
- Shopify
- Stripe
- Vue.js
- Node.js
- Firebase
- Algolia
Questions
Frequently asked questions
How much does it cost to build an e-commerce app?
Cost depends on scope, platforms and integrations. Our rates are published on the fee structure page, and the free app cost calculator gives a range for an e-commerce app with every assumption listed. We send a fixed quote after reviewing your brief.
Should I use Shopify or build a custom e-commerce platform?
Choose Shopify if you need a proven platform with built-in payment processing, inventory management, and a vast app ecosystem, ideal for launching quickly. Choose custom if you need unique checkout flows, complex product configurations, multi-vendor marketplace features, or full control over the tech stack. App369 also builds headless Shopify storefronts using the Storefront API for the best of both worlds.
What payment gateways do you integrate?
App369 integrates Stripe for credit card and ACH payments, PayPal for buyer-protected transactions, Apple Pay and Google Pay for one-tap mobile checkout, Shopify Payments for Shopify stores, and regional payment methods as needed. All integrations are PCI DSS compliant, and we implement 3D Secure for fraud prevention.
How long does it take to build an e-commerce platform?
A Shopify store with custom theme takes 4-8 weeks, a custom e-commerce website with product catalog and checkout takes 3-5 months, and a full marketplace platform with vendor management, real-time inventory, and mobile apps takes 6-12 months. App369 uses agile sprints to deliver functional increments every 2 weeks.
What mobile commerce trends should I consider?
App369 builds mobile-first e-commerce experiences optimized for these trends.
What features should my e-commerce app include?
App369 implements all of these as standard features.
Fixed-price services
Prefer a fixed price?
Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.
Start here
Start Selling Online Today
Whether you need a custom storefront or a Flutter-based mobile shopping app, get a detailed estimate by email, usually within one business day, or book a consultation ($100 per 15 minutes, paid upfront).
Fiverr reviews / 28 on Shopify work
What buyers said about this kind of work
“This was my 3rd order with Simon, and he proved that he is very smart and talented and knowledgable.”
Rachel, Canada, December 2020. Shopify on Fiverr “Szymon was very professional, had a lot of knowledge to share. Made my home page worth looking at after I butchered it. Will definitely work with this seller again on multiple projects. Please hire him, he's the BOMB. DOT. COM.”
A buyer in the United States, December 2020. Shopify on Fiverr “Great work! Fast communication, and great cooperation. Thanks for working with me. I recommend for everyone, but I have more projects for him now.”
A buyer in Hungary, November 2020. Shopify on Fiverr
Read the whole story
- Four Shopify reviews in under three months, then an app (Rachel, Canada)