Building Smarter Commerce: How DEMAND Delivers Custom API and App Development for Clients

In the modern commerce ecosystem, off-the-shelf solutions only go so far. Businesses often need functionality that goes beyond default platform capabilities—whether it’s connecting third-party systems, streamlining operations, or enhancing the customer experience. That’s where DEMAND’s custom API and app development expertise comes in.

We don’t just adapt to your systems—we engineer scalable, secure, and performant solutions that align with your business logic and long-term goals.

Why Custom APIs and Apps Matter

Out-of-the-box tools are helpful for speed, but custom development unlocks competitive advantage:

• Eliminates manual work through automation and system syncing
• Enables advanced features like personalized shopping experiences, loyalty programs, or complex business rules
• Connects siloed systems like ERPs, OMS platforms, CRMs, or analytics stacks
• Creates owned Intellectual Property (IP) and tech that’s tailored exactly to your workflows

When scaling an eCommerce brand, flexibility and integration become mission-critical—and we’re ready to build exactly what you need.

What DEMAND Can Build

Custom API Integrations

We build, integrate, and maintain APIs that connect your commerce stack:

• ERP / OMS Integration (e.g., Salesforce Order Management (SOM), NetSuite, Deck Commerce)
• PIM Sync (e.g., Akeneo, Salsify, custom product databases)
• Shipping & Tax APIs (e.g., FedEx, EasyPost, Avalara, Vertex)
• Payment Gateways (e.g., Adyen, Cybersource, Authorize.net, PayPal)
• Marketing & Personalization Tools (e.g., Klaviyo, Attentive, Salesforce Marketing Cloud)

We handle authentication, error handling, data mapping, and rate limiting to ensure your integrations are clean and reliable.

Custom App Development

Need a feature or tool that doesn’t exist? DEMAND can design and build:

• Custom Shopify Apps (embedded, public, or private)
• Middleware apps that transform and route data between platforms
• Admin tools to help client teams manage data, workflows, or integrations
• Customer-facing features like loyalty dashboards, store locators, or advanced filtering systems

Every app is built with scalability, maintainability, and performance in mind.

Our Approach

1. Discovery & Architecture

We collaborate with stakeholders to map out:

• Business logic
• Data requirements
• Existing system capabilities
• Technical constraints

This ensures that we solve the right problem and future-proof the solution.

2. Development & Documentation

Our engineering team builds robust APIs and apps with:

• Clean, modular code
• Thorough documentation
• Robust testing and validation
• Logging and monitoring where appropriate

3. Deployment & Support

We ensure smooth rollout across environments, we provide:

• Post-launch support
• Developer handoff training
• Ongoing maintenance packages (if needed)

Real-World Applications

Here’s how clients have used DEMAND’s custom development services:

• A furniture brand connected their Shopify storefront to a legacy ERP using a custom middleware app.
• A home goods brand connected their Shopify storefront to an enterprise SAP system using a custom middleware app for orders, inventory & returns.
• A beauty brand using Salesforce Commerce Cloud added a custom Einstein-powered recommendation widget across channels.
• A global retailer needed a multi-market loyalty solution, so DEMAND built a custom API framework to handle tier logic, redemption, and integrations with third-party CRMs.

Let’s Build What You Actually Need

DEMAND’s cross-functional teams bring deep platform knowledge (SFCC, Shopify, Headless) alongside backend integration experience. We’re not just developers, we’re architects, strategists, and commerce partners.

If your platform needs to do more, connect more, or simply work smarter, we’ll build what your business demands.

Ready to create a custom solution? Let’s talk.