Browse categories
Explore
Fiverr Pro
English
$
USD
I will customize shopify plus checkout with checkout extensibility with a private app
Mostofa Tanim A
Vetted Pro
Level 2
Vetted by Fiverr Pro
Mostofa Tanim A was selected by the Fiverr Pro team for their expertise.
About this gig
Turn your Shopify Plus checkout into your best-converting page. I'm a Fiverr Pro Vetted developer building Checkout Extensibility apps for growing DTC brands, run from one dashboard so your team controls everything, no code.
What goes into your checkout:
- Countdown timer, synced from cart to checkout
- Shipping protection / insurance with automatic price tiers
- One click upsells with compare at pricing and SAVE % badges
- Free shipping bar plus trust and security badges
- Review widget powered by your own real reviews
- Any custom widget your store needs
- Shopify Functions: discounts, validation, hide payment or shipping
- Message me for any custom features.
Your control dashboard: toggle any widget, edit text, prices and colours, and preview live inside Shopify. No redeploys, It's Easy!!
I build only on current APIs (Checkout UI Extensions, Functions, Admin GraphQL) and handle checkout.liquid / Scripts migration, so your checkout stays fast and upgrade-safe.
Message me with your store and goals and I'll scope it precisely.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Mostofa Tanim A
Mostofa Tanim A
Vetted Pro
Software Engineer and Full Stack Dev AI LLM Engineer
Level 2
Mostofa Tanim A is part of the Fiverr Pro catalog and has been hand-picked by a dedicated Fiverr Pro team for their skills and expertise.
Vetted for
Website Maintenance
- FromBangladesh
- Member sinceJun 2017
- Avg. response time1 hour
- Last delivery2 days
Languages
English, Spanish
Senior Software Engineer with 14+ years building scalable web platforms, custom Shopify Plus storefronts, and headless commerce systems. I architect complex theme logic, advanced storefront data models, custom Shopify apps (public and private), and Hydrogen-based headless builds backed by the Storefront and Admin APIs. My stack includes Next.js, React, TypeScript, Node.js, Turborepo, Python, PHP, and MySQL.
I design robust GraphQL and REST APIs, improve performance at scale, and deliver features that add real value to the product or stores.
Knock me for anything!
My Portfolio
Other Website Maintenance Services I Offer
FAQ
Do I need Shopify Plus?
Widgets on the Information, Shipping and Payment steps need Plus. Thank-you and Order-status page widgets work on every plan. Functions inside a custom app also need Plus; tell me your plan and I'll confirm what's possible.
Can I change the widgets myself after delivery?
Yes. The Premium package includes a dashboard inside Shopify where you turn widgets on/off and edit text, prices, reviews and colours with a live preview. No code, no redeploy.
Will the cart timer and checkout timer match?
Yes. Both read the same reservation deadline, so the countdown continues from the cart drawer into checkout instead of restarting.
How does shipping protection / insurance pricing work?
You set price tiers by cart size (e.g. $2.95 up to $50, $4.95 up to $150). Checkout switches to the right price automatically, and buyers can remove it in one click.
Where do the reviews come from?
Your own real reviews (imported or connected from your review app). I don't create or supply reviews, the widget only displays genuine ones also you have ability to add custom reviews from dashboard and you can control it.
Can you migrate my old checkout.liquid or Scripts?
Yes. I rebuild them with Checkout UI Extensions and Shopify Functions so your checkout stays upgrade-safe.
