Available for new projects

Building Shopify Experiences That Convert.

I'm John Mavon — certified Shopify, Wix & Klaviyo partner at Crest Agency.
I turn eCommerce stores into revenue-generating machines.

See My Work Book a Free Audit
Scroll
0+

Stores Built

0%

Avg. CRO Boost

0%

Client Retention

Trusted by brands worldwide

shopify
wix
klaviyo
VitalityVanguard
KitchenSolution
Mknits
GaleyandDesign
shopify
wix
klaviyo
VitalityVanguard
KitchenSolution
Mknits
GaleyandDesign
John Mavon
Certified Partner
Shopify Partner
Wix Partner
Klaviyo Partner

About me

John Mavon,
eCommerce
Growth Partner.

I'm a certified Shopify, Wix, and Klaviyo partner operating under the Crest Agency umbrella. I don't just build websites — I engineer revenue-driving systems. From bespoke Shopify 2.0 themes to Klaviyo flows that recover carts and grow LTV, every project is built with one metric in mind: your growth.

With over 50 stores launched and a client retention rate north of 98%, my approach is rooted in data, design craft, and relentless optimisation.

Adequate work experience across multiple industries
Customer-first projects with measurable ROI
Exceptional build quality — speed, accessibility, conversion
John Mavon
Partner, Crest Agency

What I do

Services Built
for Scale.

Every service is designed to drive measurable growth — no fluff, just results.

01

Shopify Store Development

Bespoke Shopify 2.0 themes engineered for speed, scalability, and conversion. Custom sections, apps integration, migrations, and headless builds available.

Shopify 2.0HeadlessMigration
02

Wix Website Design

Custom Wix sites with pixel-perfect design that authentically showcases your brand. Responsive, fast-loading, and SEO-ready from day one.

Wix StudioResponsiveSEO
03

Klaviyo Email Marketing

Advanced flows that recover carts, win back churned customers, and maximise LTV. Initial setup plus ongoing monthly management packages available.

FlowsCampaignsSegmentation
04

CRO & Optimisation

Scientific A/B testing, heatmap analysis, and UX refinements designed to squeeze every drop of ROI from your existing traffic without extra ad spend.

A/B TestingUX AuditAnalytics
05

Video Color Grading

Cinematic colour grading for product and brand videos — bringing cohesive, vibrant visuals that match your brand identity across every frame.

DaVinciBrand IdentityProduct
06

eCommerce Strategy

End-to-end consulting from platform selection to growth roadmapping. I work as a revenue partner, not just a developer — aligned on your targets.

ConsultingRoadmapGrowth

See the numbers

Real Results.
Real Revenue.

I don't hide behind jargon. These are the Shopify dashboard metrics that actually matter — pulled from real client accounts.

0%

Avg. Conversion Rate Boost

0%

ROAS Improvement (best case)

0.2s

Average Page Load Speed

0%

CPA Reduction (SEO optimised)

performance_audit.js

$ node performance_audit.js

Running audit...

✓ Store speed: 1.2s

✓ Conversion Rate: +28.4%

✓ Revenue (30d): $84,320

✓ Cart Recovery Rate: 34%

✓ Email Open Rate: 48.7%

■

Transformation

Before & After

BEFORE
AFTER
Original Site Design
→
Optimized Shopify Rebuild
Vitality Vanguard — Shopify Hydrogen Headless Rebuild · +42% CR

Selected Work

Projects That
Moved the Needle.

Vitality Vanguard Screenshot
Visit Store
Shopify+42% CR

Vitality Vanguard

Custom Hydrogen Headless Build — bespoke Shopify storefront engineered for speed and conversion, featuring advanced product configurators and seamless checkout.

View Project
Vitality Vanguard Screenshot
Visit Store
CRO+115% ROAS

The Kitchen Solution

Optimisation & Subscription UX — deep CRO audit, A/B testing, and subscription model integration that more than doubled their return on ad spend.

View Project
Vitality Vanguard Screenshot
Visit Store
+48% CPC

Mknits

Email Marketing & Automation — complete Klaviyo setup including welcome series, abandoned cart, post-purchase and win-back flows driving significant CPC improvements.

View Project
Vitality Vanguard Screenshot
Visit Store
SEO+56% CPA

Galeyan Design

SEO Optimisation — comprehensive on-page and technical SEO overhaul resulting in dramatic CPA reduction and improved organic visibility across target keywords.

View Project
Ketatov Screenshot
Visit Store
Wix+35% Sales

Ketatov

Full E-commerce Development — high-performance Shopify store build focusing on minimalist design and a streamlined mobile shopping experience.

View Project
Mirona Screenshot
Visit Store
Wix StudioGlobal Reach

Mirona

International Storefront — specialized Wix Studio implementation featuring multi-currency support and localized content for the Mexican market.

View Project

Social Proof

What Clients
Are Saying.

Client Name

Brand Name

Click to play testimonial

Video Testimonial
★★★★★

"John completely transformed our Shopify store. The new site loads in under 2 seconds and our conversion rate jumped 42% in the first month. Worth every penny."

V
Vitality Vanguard Team Shopify Plus Brand
★★★★★

"The Klaviyo setup John built for us is incredible. Our abandoned cart recovery alone pays for the entire engagement. Highly recommend Crest Agency."

M
Mknits Founder Fashion eCommerce
★★★★★

"Our ROAS more than doubled after the CRO work John did. He found issues we never knew existed and fixed them systematically. Real results, real fast."

K
Kitchen Solution CEO DTC Home Goods

Let's work together

Ready to Scale
Your Store?

Book a free 30-minute store audit. I'll identify your biggest growth opportunities and show you exactly what needs to change — no obligation.

Agency

Crest Agency

Book a Free Audit