E-commerce businesses generate more operational data — orders, inventory, customers, returns, shipping — than almost any other business type. The off-the-shelf tools (Shopify apps, WooCommerce plugins) work until they don’t. When your business has specific workflows that no plugin handles, or when you’re building the next e-commerce tool yourself, you need custom SaaS development for e-commerce that works the way your business actually works.
Zargham Labs LLC builds custom e-commerce SaaS products and integrations — from WhatsApp abandoned cart recovery systems to multi-warehouse inventory platforms — using the same stack that powers Messenjo.
E-commerce SaaS Products We Build
- WhatsApp Abandoned Cart Recovery — Automatically detect abandoned carts from your Shopify/WooCommerce store and send personalized WhatsApp recovery messages. Converts at 2-3x the rate of abandoned cart emails. Powered by Messenjo.
- Multi-Warehouse Inventory Management — Real-time stock tracking across multiple locations, low-stock alerts, purchase order automation, and supplier sync — all in a custom web application.
- Order Management Systems — Custom order processing workflows, fulfillment integration, shipping carrier APIs, customer communication automation, and return management.
- WhatsApp Order Notifications — Send order confirmations, shipping updates, delivery notifications, and review requests automatically via WhatsApp. Higher open rates than email or SMS.
- E-commerce Analytics Dashboards — Custom dashboards showing revenue, AOV, conversion rates, inventory turnover, and customer cohort metrics — pulling from your actual data, not Shopify’s limited analytics.
- B2B E-commerce Platforms — Wholesale portals with tiered pricing, minimum order quantities, credit terms, custom catalogs per buyer, and purchase order workflows.
Why E-commerce Businesses Choose Zargham Labs
- WhatsApp Integration Built In — We built Messenjo. Every e-commerce client gets access to WhatsApp automation capabilities that most custom development shops can’t offer.
- Real-Time Architecture — E-commerce needs real-time: stock updates, order status changes, payment confirmations. Our FastAPI + WebSocket + Celery architecture handles real-time data flows properly.
- Shopify & WooCommerce Expertise — We integrate with Shopify’s Admin API, Storefront API, and Webhooks. Same for WooCommerce REST API. Your custom SaaS connects to your existing store seamlessly.
- Multi-Currency & Multi-Region — Built for global e-commerce. Multi-currency support, regional tax handling, and localized customer communication are standard considerations in our builds.
- Scale-Ready from Day One — Flash sales, seasonal spikes, viral moments — we design for traffic bursts, not just steady-state load.
Tech Stack for E-commerce SaaS
- Backend: Python FastAPI — handles high-frequency order processing with async endpoints
- Frontend: Next.js 14 — fast, SEO-optimized storefronts and admin panels
- Database: PostgreSQL with proper indexing for high-volume order tables
- Real-Time: WebSockets via FastAPI for live inventory/order updates
- Queue: Celery + Redis for order processing jobs, notification sends, report generation
- WhatsApp: Messenjo / Meta WhatsApp Cloud API for customer communication
- Payments: Stripe, PayPal, regional gateway integrations
- Integrations: Shopify API, WooCommerce API, shipping carriers (DHL, FedEx, Aramex)
Frequently Asked Questions
Can you build a custom Shopify app?
Yes. We build Shopify apps (both public and custom/private) using Shopify’s official APIs and app framework. We can also build standalone systems that integrate with Shopify via webhooks and the Admin API without being a formal Shopify app.
How does the WhatsApp cart recovery work technically?
We listen to your Shopify/WooCommerce checkout abandoned webhook → store the cart data → wait the configured delay (typically 1-2 hours) → check if the order was placed → if not, trigger a personalized WhatsApp message via Messenjo with the cart contents and a checkout link. The whole flow runs autonomously via n8n or our FastAPI workers.
What’s the typical project cost for an e-commerce SaaS tool?
It depends heavily on scope. A focused WhatsApp cart recovery integration starts from $3,000. A full custom inventory management system typically runs $8,000–$20,000 depending on complexity. We give fixed-price quotes after a proper scoping call — never before.
Ready to Build Your E-commerce SaaS?
Whether you’re building an e-commerce tool to sell to other merchants, or a custom internal system for your own operation, let’s talk about what you need.
Zargham Labs LLC · E-commerce SaaS Development · US-Registered · zarghamlabs.com