• React.js
  • TecDoc VIN API
  • Shopify Custom App
  • localStorage vehicle persistence
  • GTM
  • GA4

VIN Lookup & Sticky
Fitment Bar Integration

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Client challenge

 A leading German automotive eCommerce store faced a consistent problem: over 20% of returns were caused by customers ordering parts that didn’t fit their vehicles. Product pages lacked compatibility information, and filters didn’t account for car model specifics. This resulted in user frustration, poor reviews, and increased customer support costs

Our solution

 We began with a UX audit and behavioral analytics (Hotjar, GA4) to pinpoint where users dropped off. Based on insights, we introduced

Sticky Fitment Bar

A Sticky Fitment Bar visible across all pages, allowing customers to lock in their vehicle (Year/Make/Model)

VIN Lookup Integration

VIN Lookup integration via TecDoc to auto-match parts with vehicle configuration

Real-Time Fit Messaging

Real-time compatibility messaging on each product: “✅ Fits your BMW 320i (2017–2019)”

Fitment Warning Alerts

UX fallback: clear alerts when parts don’t fit

Saved Vehicle Memory

Saved vehicle in cookies/localStorage for returning visits

VIN Lookup & Sticky
Fitment Bar Integration

Results & Measurable Impact

22

%

increase

in overall conversion rate

-27

%

reduction

in returns within 60 days

-30

%

drop

in customer service inquiries about compatibility

Improved trust and retention among repeat users

Summary:

 This project significantly improved shopping confidence for new and returning users by eliminating the biggest source of cart abandonment: uncertainty about part compatibility. By combining VIN lookup with a persistent UX element, we ensured that compatibility became a core part of the browsing journey – not an afterthought.

✅ Reliable fitment = fewer returns + higher trust = more sales

Ready to bring your vision to life?

Let’s chat about how we can design an experience that not only captivates but also converts and grows your business. 🚀

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PORTFOLIO

Our Portfolio

Explore our portfolio to see the diverse range of projects we have successfully completed. They prove our commitment to excellence and impactful results.

GA4Shopify

Boosting Revenue Without Increasing Ad Budget

The marketing team reported high monthly traffic from paid sources but flat revenue growth. ROAS was declining. The company used standard product...
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Shopify

Building Trust to Reduce Cart Abandonment

New users landed on product pages, added items to cart… but never completed checkout. Usability tests and session recordings revealed a clear...
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GTMHotjarShopify

Optimizing Mobile Conversion in a High-Traffic Store

Although mobile traffic made up 63% of the total sessions, mobile conversion rate remained stuck below 1%. Product pages loaded slowly, were...
Read More

GA4, Shopify

Boosting Revenue Without Increasing Ad Budget

The marketing team reported high monthly traffic from paid sources but flat revenue growth. ROAS was declining. The company used standard product pages with generic recommendations, no segment-based personalization, and basic filters

Shopify

Building Trust to Reduce Cart Abandonment

New users landed on product pages, added items to cart… but never completed checkout. Usability tests and session recordings revealed a clear pattern: users didn’t trust the product or the site — no signs of compatibility, no warranty information, no signals of authenticity

GTM, Hotjar, Shopify

Optimizing Mobile Conversion in a High-Traffic Store

Although mobile traffic made up 63% of the total sessions, mobile conversion rate remained stuck below 1%. Product pages loaded slowly, were cluttered, and lacked trust elements. Checkout had multiple friction points on smaller screens

Magento 2, Vue.js

Eliminating Fitment-Based Returns (DACH Market)

A mid-sized B2C & B2B retailer operating in Austria and Germany had an 18% return rate — the majority due to users selecting the wrong parts. Their PDP lacked clarity, and filtering by vehicle was hidden or unavailable. They also served workshops and fleets with unique compatibility needs

GTM, React.js

VIN Lookup & Sticky Fitment Bar Integration

A leading German automotive eCommerce store faced a consistent problem: over 20% of returns were caused by customers ordering parts that didn’t fit their vehicles. Product pages lacked compatibility information, and filters didn’t account for car model specifics. This resulted in user frustration, poor reviews, and increased customer support costs.

UI/UX

TechGear CRO Case

TechGear is a leading online retailer of high-end consumer electronics, including laptops, gaming accessories, and home automation devices.
Shops

Angular, JavaScript

MoveBoard Project

MoveBoard is an innovative application designed to streamline package transportation processes, developed by Kozak Group. Focused on front-end development, the project involved repairing existing functionality and addressing bug fixes to enhance user experience.
Logistics

Blockchain

AllianceBlock Project

AllianceBlock is a pioneering blockchain-based crowdfunding platform developed by Kozak Group, designed to securely conduct initial coin offerings (ICOs) while generating and distributing tokens. This full-stack development project involves creating front-end modules and microservices from scratch, aimed at disrupting traditional fundraising and financing models, particularly for early-stage projects.
Finance

Magento

Vintage Sport

Vintage Sports Fashion is a cutting-edge e-commerce platform developed by Kozak Group, dedicated to offering a curated selection of unique vintage sports apparel and accessories. The project emphasizes both aesthetic appeal and high performance, featuring a full-stack development approach that ensures seamless functionality across the site.
Fashion

Magento

Fashionesta

Fashionesta is an advanced multistore e-commerce platform developed by Kozak Group, designed to meet the diverse needs of fashion retailers and consumers alike. Leveraging cutting-edge technologies like Varnish for high-speed caching and Sphinx for optimized search functionality, Fashionesta provides a seamless and engaging shopping experience.
Fashion

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Contact Info

Address:

Yevhena Konovaltsia St, 36d Kyiv, Ukraine 02000

Email:

info@kozak-group.com

Phone:

+380987568230

Address: 36d Konovaltsia St., Kyiv, Ukraine

Email: info@kozak-group.com

Phone:+380987568230

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