About
The engineer who reads the test and ships the fix
I'm Jean Manzo. I've been building for the web for 14 years, the last six of them inside Shopify — themes, custom apps, Plus builds, headless storefronts, migrations. Somewhere in there I stopped caring about the code and started caring about the number it was supposed to move.
That turned out to be an unusual place to stand. The CRO people write the strategy and hand the implementation to someone else. The developers build the ticket and never find out whether it converted. Both halves get done, badly, by people who can't check each other's work.
I do the diagnosis and the implementation. That means when I tell you a leak is worth fixing, I already know what it takes to fix it — and when I ship it, I know how we'll tell whether it worked.
How I work
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Measure before touching anything
No baseline, no result. If we can't say what the number was before, we can't say the change worked.
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Speed is the lowest-hanging fruit
There are almost always two seconds sitting on the floor of a Shopify store. Nobody has to be convinced that faster is better.
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The apps are suspect number one
Eight to fifteen installed, half of them unused, all of them injecting scripts into every page load.
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Never on the live theme
Duplicate, work, preview, publish. Your store keeps selling while I work on it.
Track record
Most of my independent work has run through Upwork, where the numbers are public and I don't get to edit them:
- $100K+
- billed
- 84
- contracts
- 100%
- job success
These say one thing only: I finish what I start and clients don't regret hiring me. They say nothing about your conversion rate — that's what the audit is for.
What I work in
- Shopify themes (Liquid, OS 2.0, metafields)
- Shopify Plus & checkout extensibility
- Theme app extensions & embedded apps
- Headless (Hydrogen, Storefront API)
- A/B testing — design and read
- GA4, GTM, Clarity
- Core Web Vitals & page speed
What clients say
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"He works hard, thinks outside of the box and is dedicated to deep work principles."
Seva Mouler · CEO
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"Excellent knowledge of the Shopify platform combined with a strong work ethic."
Harry Molyneux · CRO Specialist
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"Knowledgeable and resourceful — looking forward to future projects together."
Enrique Ramirez · CEO & Cofounder
Start with the audit
Thirty minutes on a call, then 72 hours to a ranked list of what your store is losing and where.