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English
$
USD
I will build a custom shopify app with API integration
Sajjad Sindhu
About this gig
Need a Shopify app that does something the theme editor can't? I build custom and private Shopify apps using the Shopify API, automations, integrations, and store functionality tailored to how your business actually runs.
What I build:
- Custom and private Shopify apps using Shopify's Admin and Storefront APIs
- Integrations with third-party tools (CRMs, ERPs, shipping, payment, marketing platforms)
- Automated workflows inside your store (inventory sync, order processing, custom checkout logic)
- Webhooks for real-time updates between Shopify and your other systems
- Clean, documented code your team can maintain after delivery
I come at Shopify from the backend side, 6+ years building APIs and integrations, not just theme customization. If your app needs real logic, a database behind it, or a connection to a system Shopify doesn't natively support, that's exactly the kind of work I do.
Send me what you want the app to do and which systems it needs to talk to, and I'll scope it accurately before you order.
Get to know Sajjad Sindhu
Sajjad Sindhu
Full Stack Engineer AI Agents Automation Shopify Apps
- FromPakistan
- Member sinceSep 2018
- Avg. response time1 hour
- Last delivery3 years
Languages
Urdu, English
Hey, I'm Sajjad — a Senior Full-Stack Engineer (backend-focused, I like the hard problems) and AI/LLM Engineer with 6+ years of experience.
I build production AI agents (text and voice), RAG pipelines, and multi-agent systems with LangChain/LangGraph. I also build automation workflows with Zapier, Make, and n8n, custom Shopify apps, and backend APIs with Python, FastAPI, Django, and Node.js.
I've done this kind of work on contract for teams at Apple, Microsoft, and Anthropic.
I focus on systems that hold up under real users. Send me your use case and I'll get back with a clear plan.
Other Software Development Services I Offer
FAQ
Public app or private app — what's the difference?
A private app is built for your store only. A public app goes through Shopify's App Store review and can be installed by any merchant. Tell me your goal and I'll recommend which one fits.
Do I need a Shopify Partner account?
For a private app on your own store, no. For a public app, yes, and I can guide you through setting that up.
Can you integrate my store with third-parties?
Yes, via the tool's API or a webhook, as long as it exposes one, which most modern platforms do.
Will I own the app and its code?
Yes, fully yours after delivery.
Can you fix an existing Shopify app that's broken?
Yes — send me access and a description of the issue for a scoped quote.
