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Shopify development studio

Shopify work
that ships,
not stalls.

Custom apps, theme features, integrations, and rescue work, from a developer who runs three of his own apps on the Shopify App Store. Not someone learning on your budget.

Live on the Shopify App Store

Free audit back within 1 business day.

Live demoTest storeTry it
  • Fixed-price quotes, in writing
  • Your live store stays untouched
  • One developer, start to finish
  • 14 days of free bug support

Proof, not promises

My apps, up close.

Three apps paying their own way on the App Store. Built, shipped through review, and supported every day by me.
See all apps

Featured app · Cart & upsells

Flash Cart Drawer Upsell

A slide-out cart with upsells, reward bars, and a countdown that lifts AOV, without a single theme edit. It renders in Shadow DOM, so no theme can break it.

See how it works
01 / 03

Your cart

15% off ends in 09:42

$40.05 away from free shipping

  • Classic Cotton Tee

    $50.00

    Size M · White

    −2+

  • Leather Weekend Bag

    $699.95

    Colour Black

    $839.95

    −1+

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Leather Crossbody

$699.95

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Subtotal

$839.95$699.95

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Try them in the demo store

Build · Ship · Support

What I take on

A little clarity. A lot of possibility.

Build something new, extend your theme, or connect the tools behind your store. Four kinds of work, all of it Shopify.
Most requested

01 / Build & launch

Custom Shopify apps

The feature no app on the App Store actually sells.

Learn more
02 / Refine & extendTheme developmentThe section you need, not the redesign you didn’t ask for.
03 / ConnectIntegrationsShopify, your ERP and your 3PL agreeing on stock.
04 / RescueApp & theme rescueHalf-built and abandoned? I pick it up.
Explore services

My toolkit

The right tools. Built around Shopify.

Native Shopify APIs and extensions first, so what I build survives theme changes, app updates and Shopify’s own releases.
  • Shopify
  • Liquid
  • Online Store 2.0
  • Shopify Functions
  • Checkout Extensions
  • Metafields
  • Polaris
  • GraphQL Admin API
  • Remix / React Router
  • Webhooks
  • App Bridge
  • Post-Purchase Extensions
  • Node.js
  • Theme App Extensions

Sound familiar?

If one of these is your week, you’re on the right page.

Your theme settings ran out of road

Every quote you get back is for a full redesign you never asked for.

The app you need isn’t on the App Store

Six trials. Each does 70% of the job and bills monthly for the rest.

Your systems disagree about stock

Shopify says twelve, the warehouse says three, and the sync fails at 2am.

Your last developer went quiet

A half-finished repo you can’t read, and no documentation to go on.

0

Apps of my own live on the Shopify App Store

0

Developer from quote to handover. No account manager

0

Days of free bug support after your project goes live

What merchants say

Asked for a feature. Got it, fast.

I asked for a dedicated download button, and the team built it remarkably quickly, making sure it worked perfectly in my store. Responsive, professional, and genuinely open to customer feedback. Highly recommended!
Shopify merchantUsing Flash Digital Downloads

What stood out

  • Feature request shipped quickly
  • Responsive and professional
  • Open to custom requests

How I work

A clear path from brief to launch.

A written plan, a fixed price, and checkpoints you can test yourself. You know what happens next at every stage.

  1. 01

    Send the problem

    Your store URL and what’s bugging you, in whatever words you’d use out loud.

  2. 02

    Get a fixed quote

    A written scope at a fixed price, usually within 48 hours. Nothing starts until you approve it.

  3. 03

    Build and review

    Work happens on a dev store or theme copy. You test it yourself before anything goes live.

  4. 04

    Handover and support

    Code, docs and access are yours to keep, plus 14 days of free bug support after launch.

See the full process

FAQs

Before we
get started.

The practical stuff: what it costs, how long it takes, and what happens to your live store while I work.

Have a different question?

Ask me directly

Replies within 1 business day.

What can you help with?

Anything that lives inside Shopify: custom apps, checkout and post-purchase extensions, theme sections your settings can’t do, ERP/CRM/3PL integrations, and picking up builds another developer left half-finished. No WordPress, no logo design, no ad management.

Will you touch my live store?

Not until you’ve seen the work and signed off. Everything happens on a development store or a duplicated theme. Your live store keeps trading exactly as it is until you approve the change.

How much will my project cost, and how long will it take?

Small theme work usually lands in the hundreds. A custom app is normally a few thousand, depending on scope. Every project is quoted as a fixed price in writing before a line of code is written, and most theme and integration work starts within the week.

You’re one person. What if you get hit by a bus?

You own everything from day one. Code sits in your repo, apps sit under your Shopify Partner account, and every project ships with documentation written for the next developer, not for me.

What if I’m not sure what I actually need?

Then send the problem, not the spec. Working out whether you need an app, a theme change, or nothing at all is part of the free audit.

Let’s work together

Tell me about
your store.

One email is enough. I go through your theme, apps, checkout and load speed, then write back with what’s actually costing you orders. If it’s a fifteen-minute fix, I’ll tell you how to do it yourself.

Quick reply

Within 1 business day

In writing

A real audit, not a pitch

The developer

Not a sales rep

Email support@zenkai.services

What to include in your email

  1. 01Your store URLA live store, a dev store, or just the idea you want to build.
  2. 02What’s going wrongThe symptom is enough. “My cart feels slow” is a fine place to start.
  3. 03Your timingAny deadline you’re working to, and a rough budget if you have one.
  4. 04I write backWithin 1 business day: what’s wrong, what it takes, what I’d charge.

Your next fix

Ready to get it off your list?

Send your store URL and the problem in plain words. You get a written audit back within 1 business day: what’s wrong, what it takes, and what I’d charge.

Get your free audit