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From $45/hr · Working your US or EU hours

Shopify Plus development

Shopify Plus checkout extensions and Functions start at $675 (15 hours at $45), and most jobs take 1 to 4 weeks.

I build on Shopify Plus: checkout UI extensions, Shopify Functions for discount, delivery and payment rules, and Plus theme work. It's for Plus merchants whose checkout logic lived in Scripts or checkout.liquid, which no longer run. One extension or Function starts at $675 (15 hours at $45), and most jobs take 1 to 4 weeks.

Who it's for

  • Plus merchants whose discount, shipping or payment rules ran on Shopify Scripts, which stopped running on 30 June 2026
  • Plus stores that need custom fields, banners or upsell blocks in checkout
  • Brands moving to Plus that want the theme and checkout set up properly from the start
  • Wholesale sellers planning B2B on Plus (read the B2B note below first)

What you get

  • Checkout UI extensions: custom fields, banners, upsell and trust blocks, delivery notes
  • Shopify Functions for discounts, delivery and payment customisation, and cart validation
  • A custom app for your store that holds the extensions, deployed with Shopify CLI
  • Plus theme customisation and performance tuning
  • Testing in a development store before anything touches your live checkout

How it works

  1. 01 A list of what your checkout must do, starting from your old Scripts or checkout.liquid code if you still have it
  2. 02 For each item, a decision: a native Shopify setting, an App Store app or custom code
  3. 03 A fixed quote in hours at $45
  4. 04 Build and test in a development store
  5. 05 Deploy, then watch the first live orders

1 to 4 weeks. One extension or Function is usually 15 to 25 hours; replacing a full set of Scripts can take 40 hours or more.

When you don't need me

B2B is the thin part of my Plus work. I wrote a growth plan for an 8,000+ product wholesale store covering B2B reorder flows and per-unit and case pricing, but I haven't built a native Shopify B2B setup with company profiles and price lists for a client. If that is most of your project, a developer who has shipped Shopify B2B before is the safer choice. And if an App Store app already does what you need, buying it costs less than custom code.

Proof

From past work

FAQ

Questions

For extensions on the information, shipping and payment steps, yes; those are Plus only. Thank-you page extensions work on other plans too. Any plan can use Functions through public apps from the Shopify App Store, but a custom app with Functions built for your store needs Plus.

Shopify stopped running all Scripts on 30 June 2026, so each rule has to move to a Shopify Function, a public app or a native setting. I start from your old Script code if you still have it, or from how your discounts and shipping used to behave, then rebuild and test the rules in a development store.

Yes. At Louise Carter I built checkout customisations with checkout UI extensions and Shopify Functions, and I did Plus theme, subscription and performance work on the John Masters Organics UK store.

Plus pays off when you need a customised checkout, B2B or extra expansion stores, or when your sales are high enough that its lower payment rates cover the monthly fee. My Shopify vs Shopify Plus post goes through when the upgrade makes sense.

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Next step

Get a fixed quote

Send me your store URL, what you want done and your deadline. I'll reply within 24 hours with questions or a quote in hours at $45.