E-Commerce & Retail

S3Corp builds custom storefronts and commerce platforms for B2C, B2B, and marketplace models, plus the systems around them. Services include:

• Product listing and promotion management
• Payment and transaction infrastructure
• Inventory and supply chain management
• Analytics, reporting, and business intelligence
• CRM
• Platform migration and system integration
• POS system development
• Omnichannel retail solutions

Engagements range from full development to maintenance.

Choose custom when your business logic, integrations, or traffic have outgrown what a standard platform supports. Until then, a standard platform is usually cheaper.

• Your pricing rules, quote workflows, or promotions need logic a standard platform cannot express.
• Your ERP, CRM, or logistics systems need reliable integration instead of plugin workarounds.
• You run a marketplace, B2B portal, or omnichannel operation with unusual data or workflow needs.
• Peak-traffic events such as flash sales strain your current setup.

If none of these apply yet, a well-configured standard platform may serve you better. We scope your project honestly either way.

AI now powers recommendations, demand forecasting, fraud detection, and how shoppers discover products. Build first where AI moves a metric you already track.

• Start with recommendations if average order value or conversion is your bottleneck.
• Start with demand forecasting if stockouts or excess stock are costing you money.
• Start with fraud detection if chargebacks or manual review are growing.

All three depend on clean data, so unified customer profiles and real-time inventory usually come first.

Agentic commerce means AI assistants research, compare, and sometimes buy products for shoppers. Your store is ready when agents can read live catalog, price, and stock data and send shoppers to a working checkout.

• Your product data is complete, structured, and current.
• Inventory and pricing are available in real time through APIs.
• Checkout works reliably on mobile and handles payment securely.
• You have decided which protocols to support, such as UCP or ACP, or you rely on your platform to do it.

S3Corp designs API-first commerce platforms, so we can scope this with you.

Headless commerce separates the storefront your customers see from the back end that runs catalog, pricing, orders, and payments. The two connect through APIs.

It pays off when you need several front ends, such as a website, PWAs, and mobile apps, on one back end. It adds engineering effort, so smaller stores often do not need it.

Headless also fits composable commerce, where you assemble best-of-breed services such as search, cart, and payments through APIs.

S3Corp designs headless commerce architecture with API-first principles. Our PWA development guide explains how PWAs work and what they cost.

Scope sets the timeline. Typical ranges for custom and enterprise e-commerce platform development:

• A focused platform covering core storefront, payment, and inventory typically takes four to six months.
• An enterprise e-commerce platform with custom ERP integrations, CRM connectivity, and multi-region support can take eight to twelve months or longer.

We provide a detailed scope and timeline estimate at the start of every engagement.

Cost depends on scope, integrations, and team size, so a range is more honest than a single number.

In Vietnam, a small team of two to three people typically costs $8,000 to $15,000 per month. A medium team of five to eight people costs $20,000 to $35,000.

S3Corp's published guide puts small web applications near $20,000 and complex enterprise systems above $200,000. A custom e-commerce build lands between them.

Six factors move the number most:

• The scope and number of features you need.
• The number and complexity of integrations with ERP, CRM, 3PL, and marketplace systems.
• Your architecture, such as headless, multi-store, or multi-region.
• The engagement model you choose.
• Security requirements such as PCI DSS.
• Accessibility rules such as the European Accessibility Act, which has applied to many online shops selling to consumers in the European Union (EU) since 28 June 2025.

The most useful next step is a requirements walkthrough that ends in a realistic estimate. Request your estimate.

A multi-vendor marketplace costs more than a single-brand store because it adds seller-side systems on top of the storefront.

• Seller onboarding flows
• Commission logic
• Search and discovery infrastructure
• Multi-vendor order management
• Payment and transaction infrastructure

We do not quote a marketplace number before scoping these pieces with you. A consultation gives you a realistic range first.

Yes. Integration is a core competency, and we design every integration for reliability and maintainability. You can connect:

• ERP systems such as SAP, Oracle, and Microsoft Dynamics.
• CRM platforms such as Salesforce and HubSpot.
• Accounting tools and logistics providers through 3PL APIs.
• Marketplaces through APIs such as Amazon SP-API.

A zero-downtime migration runs the old and new platforms side by side and moves traffic over in controlled stages, so customers never see an outage.

A good plan protects four things:

• Your search rankings, through address mapping and redirects that preserve SEO equity.
• Your product, customer, and order data.
• Your live integrations with ERP, CRM, logistics, and payments.
• The cutover itself, which is tested and has a fallback.

The same pattern applies when you move from Magento / Adobe Commerce to a headless, API-first architecture. We build this plan with you during scoping, before any code moves.

We build on Shopify and Shopify Plus, Magento / Adobe Commerce, WooCommerce, Shopware, BigCommerce, and fully custom-built platforms.

Your business requirements choose the platform, not our tooling preferences. When your needs outgrow a packaged platform, we build custom.

Yes. B2B commerce differs from B2C, and we build for those differences:

• Account hierarchies.
• Custom pricing tiers and contract-based discounts, delivered through a custom pricing engine.
• Quote and approval workflows.
• Bulk order management.
• Deep ERP integration.

S3Corp has built B2B buyer portals for manufacturers, distributors, and FMCG companies across Southeast Asia.

Vietnam combines engineering depth, lower costs, and a mature outsourcing ecosystem. A specialist partner also brings full-stack commerce capability under one engagement.

• Vietnam has 500,000+ technology professionals, and about 50,000 new technology graduates join each year.
• Developer rates run 60–70% below rates in the United States and Western Europe.
• Vietnam ranked 7th of 78 countries in Kearney's 2023 Global Services Location Index, the most recent edition.
• Asia-Pacific overlap is strong, and a London morning is a Vietnam afternoon.

North American teams need more flexibility: when it is 9 AM in New York, it is evening in Ho Chi Minh City. Teams usually shift hours for overlap and rely on structured written updates.

Through our Offshore Development Center (ODC) model: a dedicated team that works as a virtual extension of your engineering team.

• You select the team.
• Team size adjusts to your needs.
• The ODC manager can come from S3Corp or from your company.
• The engagement runs on an annual ODC contract.

Security sits inside the delivery process, not at the end of it. S3Corp's certified practices cover risk assessment, secure code review, least-privilege access, encryption, and separate client environments.

S3Corp builds payment work with PCI DSS considerations in mind. Your own PCI DSS duties depend on how you take payments, so confirm the scope with your payment provider.