I will develop custom private shopify apps and fix app bugs

Fahad Hasan

Bangladesh

I speak Bengali, English, Hindi, Urdu

36 orders completed

7 plus years building Shopify apps, stores and mobile apps

I'm Fahad Hasan Rume, a full-time software engineer with 7+ years of experience, working across four things: Custom private Shopify apps built to your spec, plus bug fixes on apps you already run. Sh...
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About this Gig

Fiverr Gig Description Shopify Custom App Development & Bug Fixes

Need a custom Shopify app built from scratch, or is an existing app throwing errors, breaking checkout, or misbehaving after an update? I build and fix private/custom Shopify apps using Shopify CLI, Admin API, Storefront API, and Web Pixels production apps, not templates, not quick hacks.

WHAT I CAN BUILD/FIX:

  • Custom private apps (Admin API, Metafields, Webhooks)
  • App bugs broken installs, auth/OAuth errors, API rate-limit issues, crashing scripts
  • Checkout/Web Pixel extensions & app embeds (theme app extensions)
  • COD order flows with OTP phone verification (anti-fraud)
  • Courier & payment gateway integrations (Pathao, SteadFast, bKash, SSLCommerz, EPS)
  • Order automation, fraud checkers, marketing/SMS modules
  • Migrating deprecated APIs (Checkout.liquid Extensions)

RECENT WORK:

Built a full COD order-management app for a children's toy Shopify store, replacing native checkout with a custom Buy Now popup delivered as an app embed. It handles OTP verification via SMS to block fake COD orders before they fire Meta/Google/TikTok purchase pixels, plus fraud checking, multi-courier dispatch etc.

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develop custom private shopify apps and fix app bugs
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develop custom private shopify apps and fix app bugs

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