Shopify Plus Developer

I build the app features your store can own.

The feature stays, and the app's monthly bill and extra code go. Apps that earn their place, like email or loyalty, stay. I measure the page before and after.

Request a build quote

Tell me what you want built, then pick a time to talk.

A store I worked on

Before

Press the button to watch the numbers change.

  • Leftover scripts Running
  • SEO app Running
  • Checkout button app Running
  • Page builder app Running
  • Native theme code Not built yet
  • Theme Kept
Fully loaded time
37.3s
Files loaded
227
Page size
4.98 MB

Measured in GTmetrix, a page-speed testing tool, one report before and one after. The three figures come from the whole rebuild together.

How I work.

01 · Map

I map what loads.

Every app and script on your store, with what each one costs in load time and monthly fees.

02 · Decide

I decide what stays.

Shopify's own features first, a well-built app second, custom code last. If your email or loyalty app is doing its job, it stays, and I make its widget lighter.

03 · Cut

I cut the rest and measure it.

Apps nobody uses come out, along with code that uninstalled apps left in the theme. I measure the page before and after every change.

Bloat Score calculator

What do your apps cost you over three years?

Two numbers from your Shopify admin. No email needed to see the result.

Performance Lab · native reviews

One review app added 54 requests to a product page.

I kept the app for collecting reviews and rebuilt only the display, with Shopify's own features. The page now loads one small file of its own, for moving between pages of reviews. New reviews show up after the next sync. The store decides how often it runs: hourly, daily or weekly. Photo and video reviews aren't in the standard build, and I can add them, quoted separately.

Script files on one product page

  • Review app's widget 54 requests · 296 kB transferred
  • My native display 0 external requests · 0 kB

Chrome DevTools, script files only, measured October 25, 2026. My display loads one small file from my own theme, for the review page numbers.

What I build

When an app should go, I build what replaces it.

When Shopify's own tools can do an app's job, I rebuild the feature inside your store and measure the page before and after. Here are four I've built.

I measure every build's effect on page speed before I hand it over.

Replaces a review app's widget

Performance Lab

Review display

Your review app keeps collecting and moderating. Your theme shows the stars and the reviews.

The trade-off

New reviews show up after the next sync. The store decides how often it runs: hourly, daily or weekly. Photo and video reviews I can build in, quoted separately.

See the build →

Replaces a store locator app

Performance Lab

Store locator

Your locations live in Shopify, and the page loads no vendor widget.

The trade-off

Locations are edited in the Shopify admin. If your team wants its own editing screen, I can build one, quoted separately.

See the build →

Replaces a bundle app

Performance Lab

Bundle discounts

Shopify itself works out the bundle price, so no app code runs in the shopper's browser.

The trade-off

I set up your bundle rules as part of the build. New rules, or a screen your team uses to change them, I can build too, quoted separately. Custom Functions need Shopify Plus.

See the build →

Replaces a page builder app

Working demo on this site

Page builder pages

Pages made in a page builder app, rebuilt as sections your team edits in the theme editor. On one store I worked on, the page builder came out along with two other apps.

The trade-off

Your team builds new pages from the sections I make. A section you need that isn't there yet, I can build, quoted separately.

See the build →

Your app

An app that isn't on this page

Tell me what the app does for your store. On a free call, I'll tell you whether Shopify's own tools can do the same job and how I'd build it. That includes product configurators, tiered and volume pricing, cart rules and checkout features.

The trade-off

Some larger builds run inside Shopify's checkout and need Shopify Plus. Your quote says if yours does.

How a build is quoted →

Apps whose value is their network, like email and SMS or loyalty, stay.

Watch the work.

Videos load only when you press play, so they don't slow this page down.

Shopify bundles: keep your bundle app or replace it?

Robert sitting at a desk with two computer monitors in his home office.

I'm Robert Foster. FosterUI is just me.

The person who looks at your store is the same person who does the work. I'm in Jacksonville, Florida, on Eastern time.

Questions before you book

What does it cost?

That depends on the work. The Diagnostic Audit is $500, $1,000 or $1,500, depending on your store, and I confirm which one on the first call. For a build, I send you a quote within 4 hours of the call, or of anything I ask you for on the call. If a build of $5,000 or more starts within 90 days of your report, the audit fee comes off it in full.

Who does the work?

I do. The person on the call is the person who writes your report.

Do you remove every app?

No. If an app does a job Shopify can't do itself, like your email and SMS app or your loyalty program, it stays, and I look at making its widget lighter. The report lists every app I'd keep and why.

Who builds the fixes?

I can, or your own developer can. I write the report so either of us can follow it.

Is this only for Shopify Plus stores?

No. I've built on Shopify for 12 years, the past six exclusively on Plus, but the audit works on any Shopify plan. The report marks any fix that needs Plus.

Not sure what to build yet? A Diagnostic Audit tells you where to start.

You get a written report of what I'd cut and what I'd keep, in the order I'd do it. If I don't find anything worth fixing, the report says so.

$500, $1,000 or $1,500 · delivered within 7 business days

First, a 30-minute call. You'll know the exact price before you commit to anything.

Book a Diagnostic Audit