Shopify Conversion Engineering Service

Your Traffic Is Converting.
Just Not Enough of It.

We deliver technical Shopify conversion engineering that maps the exact friction points killing your checkout — layout shifts, conflicting scripts, broken mobile flows — and engineers them out permanently. Not A/B tests. Not button colors. Root-cause fixes tied to measurable CVR lift.

For Shopify Plus brands spending $30k–$200k/month on paid acquisition. Project-based. No retainer required to start.

Get a Free Conversion Audit See How It Works

+22%Avg. CVR lift per engagementmeasured over 60-day post-deployment window

9 daysFastest checkout fix deployed$40k/month recovered from abandoned carts

2.1% → 3.4%CVR before and afterHealth & Wellness Shopify Plus brand

21 daysAvg. time to full deploymentfrom audit delivery to production

Certified Partners & Supported Infrastructure

The Problem

Your Shopify Conversion Problem
Is Technical. Not Creative.

Most agencies recommend new copy, new creative, or a redesign. We look at your checkout CLS score, your iOS Safari error logs, and your mobile funnel drop-off data. Here's what's actually stopping your buyers from converting — and why it requires engineering to fix, not marketing.

Invisible UX collapse. At the worst moment.

Checkout Layout Shift

Your checkout is technically functional — but it's shifting. Elements are jumping position as the page loads: the payment method selector appears, then re-renders. The place order button moves. A trust badge loads late and pushes everything down. Each of these Cumulative Layout Shift events causes a high-intent buyer to tap the wrong element, lose their place, or simply stop trusting the page. It happens in milliseconds. It costs thousands per month. And it's invisible to every tool except a CLS-aware code audit.

Checkout layout shift eliminated

CLS 0.31CLS 0

How checkout layout shifts kill CVR

Silent failures. Visible revenue loss.

Conflicting Checkout Scripts

Third-party apps — trust badges, loyalty programs, upsell tools — inject JavaScript into your checkout flow. When two scripts compete for the same DOM elements, or when a script fires before the checkout is fully rendered, you get intermittent failures. Buttons that don't respond. Payment selectors that reset. Forms that submit to nothing. These bugs don't appear in your testing because they're browser-specific: most commonly iOS Safari, affecting 40–60% of your mobile buyer traffic. They don't show in Shopify analytics because they look like voluntary abandonment.

Checkout completion rate after script fix

24% completion39% completion

Why your checkout fails on iOS Safari

Mobile traffic up. Mobile revenue flat.

Mobile Funnel Friction

Most Shopify stores have 60–80% mobile traffic but mobile CVR that's 40–60% lower than desktop. The gap isn't design — it's friction architecture. Tap targets that are too small for thumbs. Quantity selectors that are impossible to adjust without zooming. Variant selectors that require excessive scrolling. Add-to-cart buttons that disappear below the fold on small screens. None of these are visible on desktop QA. All of them are destroying your mobile conversion rate silently, every single day, on the majority of your traffic.

Mobile CVR after funnel rebuild

1.1% mobile CVR2.4% mobile CVR

Why your mobile CVR is half your desktop CVR

Every store we audit has at least two of these three problems simultaneously. They don't appear in your analytics as technical failures — they look like normal abandonment. Our Shopify conversion engineering process identifies and eliminates each one in a single engagement.

The Process

How Our Shopify Conversion Engineering
Works in 21 Days.

Five phases. Every one documented. Every change tied to a CVR measurement. No heatmap recommendations recycled from another client's audit. No generic UX checklists. Your funnel, your specific friction, fixed at the root.

Days 1–3
Conversion Leak Audit
Before we touch a single line of code, we manually map every drop-off point in your funnel. We analyse heatmap data, review session recordings at checkout, run cross-browser tests (especially iOS Safari), and pull JavaScript error logs from your checkout flow. Every finding is quantified: which specific friction point is causing how many abandonments per month, translated into estimated lost revenue. You receive a written Conversion Leak Report within 72 hours.
Deliverable:Conversion Leak Report — every friction point mapped, quantified, and prioritised by revenue impact
- Manual audit
- iOS Safari testing
- 72hr delivery
Days 3–8
Checkout Layout Shift Elimination
We audit every CLS event in your checkout flow — the DOM elements that shift position as the page loads and cause buyers to tap the wrong thing at the critical moment. Payment selectors, trust badges, shipping calculators, upsell injections — each is tested across devices and browsers, fixed at the code level, and verified against a CLS target of 0. We document every change with before/after CLS measurements so you can see exactly what was stabilised.
Deliverable:Checkout CLS report with before/after measurements per element + browser verification
- CLS elimination
- Cross-browser fix
- Payment UX
Days 5–12
Script Conflict Resolution
Every third-party app in your checkout is audited for conflict behaviour. We identify scripts that load out of sequence, scripts that compete for the same DOM nodes, and scripts that produce intermittent failures on specific browsers or devices. Conflicts are resolved through script deferral, load-order correction, or surgical removal of scripts that produce no measurable conversion benefit. Every resolution is tested across iOS Safari, Chrome mobile, and desktop.
Deliverable:Script conflict log — every conflict identified, resolution documented, browser test results
- Script audit
- iOS Safari
- Zero conflict target
Days 8–17
Mobile Funnel Rebuild
We rebuild the mobile friction architecture of your store's conversion funnel — from product page to order confirmation. Tap targets are corrected to minimum 44px. Variant selectors are rebuilt for thumb navigation. Sticky add-to-cart behaviour is implemented where CVR data supports it. Quantity selectors are fixed for one-handed use. The goal is a mobile funnel where every interaction that matters is frictionless on a 375px viewport with one thumb.
Deliverable:Mobile funnel rebuild with device-tested before/after CVR baseline comparison
- Mobile-first
- Thumb navigation
- ATC optimisation
Days 17–21
A/B Testing Infrastructure & Handoff
Once the structural friction is removed, we set up a statistically valid A/B testing infrastructure so you can continue optimising with confidence. This means a properly powered test framework — not the underpowered, multi-variable tests that produce misleading data. We document your post-engagement CVR baseline, define the testing velocity needed for statistical significance given your traffic, and hand off a testing roadmap for the next 90 days.
Deliverable:A/B testing framework setup + 90-day testing roadmap with sample size calculations
- A/B infrastructure
- Statistical validity
- 90-day roadmap

Every engagement starts with the free Conversion Leak Audit. No code is touched and no scope is agreed until you've seen exactly which friction points are costing you how much revenue. You decide what to fix — we never assume scope.

What's Included

Everything in the Shopify
Conversion Engineering Service.

No ambiguity. No upsells. Here's every deliverable you receive in a Webulux Shopify conversion engineering engagement — from the first friction audit to 30 days post-deployment.

Audit & Friction Mapping

Manual checkout flow audit — every drop-off point identified across devices
iOS Safari-specific testing — the browser responsible for most hidden checkout failures
JavaScript error log analysis — every silent script failure in your checkout documented
Heatmap and session recording analysis on checkout pages
CLS measurement on every checkout element across mobile and desktop
Estimated revenue impact per friction point — delivered in 72 hours

Conversion Engineering

Checkout layout shift elimination — CLS target of 0 on all checkout pages
Script conflict identification and resolution across all third-party checkout apps
Mobile funnel rebuild — tap targets, variant selectors, ATC, quantity selectors
Payment UX optimisation — selector behaviour, error messaging, confirmation flow
Sticky add-to-cart implementation where CVR data supports it
Cross-browser checkout verification — iOS Safari, Chrome, Firefox, Samsung Internet

A/B Testing Infrastructure

Statistically valid A/B testing framework setup — not underpowered multi-variable tests
Sample size calculations based on your actual traffic volume
90-day testing roadmap with prioritised hypotheses
Test result tracking setup with CVR baseline documentation

Reporting & Handoff

Before/after CVR comparison — measured over 30-day post-deployment window
Full friction resolution log — every change documented with CVR impact
Checkout CLS before/after report with per-element measurements
Post-engagement CVR baseline for ongoing A/B testing reference
30-day monitoring to confirm lift holds under real traffic conditions

We Fix the Friction. Or We Keep Working.

Our Conversion Engineering engagement has one outcome target: measurable CVR improvement tied to the specific friction points we identify in your audit. If we don't produce a measurable lift in the initial engagement, we continue working at no additional cost until we do. We've never had to invoke this — but the commitment is real.

Pricing: Project-Based. Scoped After Your Audit.

We don't publish fixed pricing because the scope depends on what we find in your store's friction audit. A store with one checkout CLS issue and a clean script stack takes less work than a store with three conflicting checkout scripts, a broken mobile funnel, and five years of accumulated app debt. Your free Conversion Leak Audit includes a cost estimate — before you commit to anything.

→Free Conversion Leak Audit before any investment
→Fixed-scope project — no open-ended billing
→Custom quote based on your specific friction findings
→No retainer required to start

Verifiable Technical Outcomes

Engineering Proof.
Not Marketing Fluff.

LCP: 4.8s → 1.2s

“The speed optimization sprint was flawless. They removed over 800kb of dead ghost scripts from apps we had deleted years ago. Our LCP dropped from 5.2s to 1.1s and our bounce rate on mobile dropped overnight. We had no idea deleted apps were still loading JavaScript on every page.”

Michael ChangTechnical Founder
$40M/yr Apparel & Fashion Brand

620kb dead JS removed

“Our store had been live for four years and we had installed and deleted at least 20 apps over that time. Webulux found 620kb of dead JavaScript still loading on every single page. After removal our LCP went from 5.1s to 1.4s. Revenue that month was up 107%. The math on this is brutal. We had been losing money for years.”

Priya NairE-commerce Director
Home Goods Shopify Plus

-2.8s mobile LCP

“I was skeptical that page speed was our problem. Our ads were converting fine on desktop. Webulux showed me that 74% of our traffic was mobile and our mobile LCP was 4.1 seconds. After their Liquid refactor it dropped to 1.3 seconds. Mobile revenue went up 44% in 30 days. I wish I had done this two years ago.”

Sofia MendesDTC Founder
High-Ticket Skincare Brand

Proof It Works

Shopify Conversion Engineering Results.
Real Stores. Real Numbers.

These CVR lifts came from fixing technical checkout and cart friction — no redesign, no new ad creative, no copy changes. Every metric below is tied to a specific engineering intervention.

Food & Beverage (CPG)ShopifyConversion Engineering

CVR

4.3%10.1%

LCP

5.4s1.4s

Monthly revenue$70k/mo

Time to result30 Days

Custom Cart Engineering Scales CPG Brand to $70k/mo

Spending $15,000/month on Meta ads to generate $30,000 in return. The founder assumed they needed more traffic. Our forensic audit revealed the opposite: years of app debt — abandoned heatmap integrations, dead countdown widgets, heavy image sliders — had dragged LCP to 5.4 seconds and turned an impulse-buying journey into a friction maze.

Friction Removed:

Ghost script purge: deleted legacy popup software, expired countdown widgets, and dead tracking scripts
Native flavor selector built directly into the product page — instant switching, zero page reloads
Cart drawer rebuilt from scratch with dynamic free-shipping progress bar and one-click quantity adjustments
Smart bundle recommendations engineered natively into the cart drawer — no third-party app dependency

$70k/moRevenue on the exact same $15k ad spend

Read full case study →

Minimal Desk & Gaming GadgetsShopifyConversion Engineering

CVR

1.0%3.3%

LCP

6.0s< 1.0s

Revenue2x ($30k/mo)

Time to result90 Days

13-App Purge and Variant Architecture Fix Doubles Revenue

Spending $10,000/month on Meta to generate $15,000 in revenue — technically profitable, but with no margin left. 13 accumulated third-party apps were locking the mobile main thread. Worse, every product variant existed as a separate listing, forcing customers to bounce between URLs just to compare a Walnut finish to an Oak finish.

Friction Removed:

Deleted all 13 third-party apps — natively rebuilt variant swatches, review widgets, and bundle logic in Liquid
Restructured the entire variant catalog using Shopify metafields — instant finish switching, no page reloads
Rebuilt the product customizer in lightweight React components — configuration logic moved to JSON to stop DOM re-renders
Converted all heavy banners to WebP/AVIF with proper srcset rules and critical rendering path prioritization

2x Revenue$15k → $30k/mo on the same ad spend

Read full case study →

View all case studies →

The Difference

Why Our Shopify Conversion Engineering
Finds What Generic CRO Misses.

Most CRO agencies end with a heatmap and a list of copy suggestions. We end with fixed checkout code and a measured CVR lift. Here's exactly how our approach differs from every other option you're considering.

What's being compared	Generic CRO approach	Webulux Conversion Engineering
Audit method	Install a heatmap tool, review clicks, generate a list of UX recommendations	Manual checkout audit — JavaScript error logs, iOS Safari testing, CLS measurement per element, session recording analysis at the drop-off point
iOS Safari testing	Not covered — most agencies test on Chrome desktop and call it done	Every checkout fix verified on iOS Safari — the browser responsible for 40–60% of mobile buyer traffic and most hidden checkout failures
Checkout CLS	Not measured — layout shifts are invisible in standard heatmap or analytics tools	CLS measured per checkout element, before and after. Target: 0. Every shift event identified and resolved at the code level
Script conflicts	Not investigated — third-party app scripts are treated as black boxes	Every third-party script in checkout audited for conflict behaviour, load sequence issues, and DOM competition — then fixed or removed
A/B testing	Recommend testing button colour, headline copy, and CTA text — often with underpowered sample sizes	A/B infrastructure set up after structural friction is removed. Proper sample size calculations. Tests that produce statistically valid data
Mobile funnel	Responsive design review — checks if elements display correctly on mobile	Tap target audit, thumb-navigation rebuild, sticky ATC implementation, one-handed variant selector optimisation — tested on real devices
Revenue tie-in	Report on clicks, scrolls, and heatmap hotspots — no revenue correlation	Every friction point assigned an estimated monthly revenue impact before fix. Every resolution measured against CVR baseline after fix
Design changes	Usually requires redesign or new creative to see CVR improvement	Zero visual change — we work inside your existing theme and checkout. Your store looks identical; the technical friction is gone

Right fit for this service:

High add-to-cart rate but low checkout completion
Mobile CVR significantly below desktop CVR
Checkout abandonment above 65–70%
iOS Safari users converting at a lower rate than Android
Shopify Plus or $30k–$200k/month on paid acquisition
Tried A/B testing with inconsistent or inconclusive results
Recently installed or uninstalled checkout apps

Not the right fit:

Store under 50,000 monthly visitors — insufficient A/B test traffic
CVR problem is offer or creative, not funnel — low add-to-cart rate
Looking for a visual redesign alongside conversion work
Under $15k/month revenue — audit ROI won't justify engagement

Common Questions

Shopify Conversion Engineering:
Your Questions Answered.

Everything you need to know about our conversion engineering service before booking a call.

What is Shopify conversion engineering?

Shopify conversion engineering is the technical process of identifying and eliminating the specific friction points in your store's checkout funnel that cause high-intent buyers to abandon. At Webulux, this means manual friction mapping, checkout layout shift elimination, conflicting script resolution, and mobile funnel rebuilding — not heatmap recommendations or button colour tests. The difference from generic CRO is the diagnosis method: we start with JavaScript error logs, CLS measurements, and iOS Safari cross-browser testing, not with click data and hunches.

Why is my Shopify checkout abandonment rate so high?

High Shopify checkout abandonment is almost always caused by technical friction, not design or copy. The most common causes are: layout shifts during checkout that cause accidental taps on the wrong elements, conflicting third-party scripts that cause intermittent failures on iOS Safari (affecting 40–60% of mobile buyer traffic), slow checkout load time that breaks purchase momentum, and payment selector bugs that appear on specific devices. These issues look like voluntary abandonment in your analytics — they're invisible without a code-level audit.

How long does Shopify conversion engineering take?

Most Webulux conversion engineering engagements are fully deployed within 14–21 days from audit delivery. The fastest wins — checkout layout shift fixes and conflicting script removal — often produce measurable CVR improvement within the first week of deployment. Our fastest case study recovered $40k/month in checkout revenue in 9 days. The full engagement — audit, checkout fixes, mobile funnel rebuild, and A/B testing infrastructure — runs across 21 days, followed by 30 days of post-deployment monitoring.

What CVR improvement can I expect from Shopify conversion engineering?

Our clients average a +22% CVR lift across all conversion engineering engagements, measured over a 60-day post-deployment window. Individual results depend on the severity of friction in your current funnel — stores with unresolved checkout layout shifts, conflicting iOS Safari scripts, or broken mobile flows tend to see larger lifts because there is more structural friction to remove. Your free Conversion Leak Audit includes a specific revenue impact estimate for your store before you commit to anything.

Do I need to redesign my Shopify store to improve conversion rate?

No. Every Webulux conversion engineering engagement produces measurable CVR improvement within your existing design. We work inside your current theme, checkout configuration, and app stack — fixing the technical root causes of drop-off without changing your visual presentation. Our case study clients achieved CVR lifts of +22–82% with zero visual changes to their stores. A redesign is only recommended when the visual architecture itself is the fundamental barrier — which is rare, and not where most stores' CVR problems actually live.

What is checkout friction mapping?

Checkout friction mapping is the process of identifying every technical and UX barrier that prevents a high-intent buyer from completing a purchase once they've reached checkout. At Webulux, this combines heatmap analysis at the checkout stage, session recording review of abandonment events, JavaScript error monitoring during checkout, cross-browser testing (especially iOS Safari vs Chrome), CLS measurement per checkout element, and funnel drop-off analysis tied to specific device/browser combinations. The output is a map of every friction point with an estimated monthly revenue cost per issue.

Have a question that isn't answered here? Book a free 30-minute discovery call → We review your store before the call and come ready with specific findings about your checkout funnel.

Free for Qualifying Stores

Start With the Free Conversion Audit.
Commit to Nothing.

Every Webulux Shopify conversion engineering engagement starts with a free, manual Conversion Leak Audit. Our engineering team personally reviews your checkout flow — not a tool, not an automated scan. You'll know exactly which friction points are killing your CVR, which scripts are failing on iOS Safari, and what fixing each one is worth in recovered revenue — before you commit to anything.

What's Inside Your Audit:

Checkout friction map — every drop-off point identified with estimated monthly revenue cost
iOS Safari testing — the specific checkout failures killing your mobile buyer traffic
CLS measurement per checkout element — which shifts are causing mis-taps and how much they cost
Script conflict report — every third-party app creating checkout failures, named and documented
Prioritised fix roadmap — ordered by revenue impact, not by technical complexity

Manual. Not automated. Our engineering team personally reviews every checkout flow. Limited to 5 audit requests per week to maintain quality.

Only 4 audit spots remaining this week

Apply for Free Audit Book a Discovery Call

Secure & Confidential Review

Your Traffic Is Converting.Just Not Enough of It.

Certified Partners & Supported Infrastructure

Your Shopify Conversion ProblemIs Technical. Not Creative.