Case StudiesData Processing with Google CloudSoftware DevelopmenteCommerce and Online B2Be-Learning and Publishing

INTRO

Cartepedia.ro is one of Romania’s leading online bookstores, offering tens of thousands of titles and fast nationwide delivery. Over time, the platform became a trusted destination for readers.

However, its website design had remained unchanged for more than five years. During that period, user expectations and e-commerce standards evolved significantly, and the outdated interface started limiting browsing quality, conversion, and customer retention.

To stay competitive and provide a smoother, more inspiring shopping journey, Cartepedia needed a UX-driven redesign aligned with modern online retail best practices, focused on clarity, trust, and usability across every step of the customer journey.

OPTI worked based on recommendations from a digital agency, refining UX and SEO in multiple feedback loops. Results after 90 days included +20% conversion rate and +70% Google search clicks and impressions.

Modernizare UX & SEO E-Commerce Cartepedia

CHALLENGES

As Cartepedia prepared to modernize its online store and align with current UX and CRO standards, four key challenges emerged:

1. Technical Debt & UX Friction

  • Over five years of legacy code resulted in slow load times and a rigid interface. Navigation and visual hierarchy no longer matched modern e-commerce expectations, and technical debt had become a brake on growth.

2. Conversion Barriers

  • Essential pages (Home, Product, Cart & Checkout) lacked clear CTAs, transparent delivery info, and optimized flows, causing stagnating conversion rates.

3. Retention and Re-Engagement Opportunity

  • Returning customers had limited incentives, with no strong Account zone and scarce personalized recommendations.

4. Lack of Self-Service Features

  • Users couldn’t easily access order history, invoice downloads, or delivery status, leading to unnecessary support requests and reduced loyalty.
Lucian Cârlogea
“We refactored a decade of legacy code into a unified base. It massively reduces technical debt, cut page load times in half and laid the groundwork for new AI features such as chatbots.”
Lucian Cârlogea, Senior Engineer

SOLUTION

FROM AUDIT TO RESULTS

We delivered a redesign built for trust, top speed optimizations, and a clear shopping experience.

  1. Home Page and AI-Ready Search
    • A new homepage with a clear hero banner, themed shelves, and personalized recommendations, supporting both quick search and inspirational browsing.
    • Implemented Sphinx Search Server with semantic features for speed and relevance, and prepared the backend to support Google Gemini for future conversational AI.
  2. Performance-First Product Pages
    • Rebuilt product UX with clear pricing, large CTAs, transparent delivery info, rich content (descriptions, reviews), and smart cross-sells.
    • Technically rewritten to achieve an LCP of 0.5s for SEO dominance.
  3. Simplified Cart & Checkout
    • Streamlined flow with editable cart, visible totals, guest checkout, easy forms, and transparent payment options for fewer steps and greater trust.
  4. New User Account Area
    • Introduced “My Account” with order history, tracking, billing/shipping details, and invoice downloads, boosting self-service and retention.
This project proves that addressing technical debt is a growth strategy. By achieving a Largest Contentful Paint (LCP) of 0.5s and integrating semantic search, the platform moved into the top tier of Core Web Vitals, directly correlating with a massive organic traffic surge.

BEFORE & AFTER HIGHLIGHTS

Over the last 90 days, the purchasing rate improved by aprox. 20% versus the previous period.

Actualizări UX Cartepedia

The growth in both clicks and impressions by aprox. 70% confirms that the technical upgrades were rewarded by Google, driving significantly more qualified organic traffic.

Actualizări UX Cartepedia

LCP at 0.5s places Cartepedia in the top tier of Core Web Vitals.

Actualizări UX Cartepedia

RESULTS

AFTER 90 DAYS

Top-Tier Performance

Legacy refactoring and infrastructure upgrades cut load times in half, achieving an LCP of 0.5s.

+70% Organic Growth

Google Search impressions and clicks grew by ~70% after re-indexing and Core Web Vitals gains.

+20% Conversion

Cleaner product pages and simplified checkout reduced friction and boosted conversions by ~20%.

Higher Engagement

The new account area and personalized recommendations increased session length and re-engagement.


TECH AND METHODOLOGY

  • Services: UX/UI Design, Front-end Dev, Technical SEO.
  • Tech: PHP, Yii Framework, Sphinx Search Server, MySQL, Cloudflare, Postmark, Google Gemini, Google Analytics, Search Console, Sentry, Bugbug.
  • Standards: ISO 9001 (quality), ISO 27001 (information security), Core Web Vitals.

Proof of Engineering: Achieving a 0.5s Largest Contentful Paint (LCP) moved the site into the top tier of Core Web Vitals, directly triggering organic traffic growth.



Performance-First Build

Refactored legacy code and optimized critical paths for ultra-fast UX and SEO lift.

Semantic Search

Sphinx-powered relevance and speed to support large catalogs and discovery browsing.

AI-Ready Architecture

Backend prepared for Google Gemini features like conversational shopping assistants.

References

Quick Questions

What was the main goal of the Cartepedia project?

To modernize the 5-year-old interface, fix technical debt, and align with current UX/CRO standards to boost conversion and retention.

How did the technical changes affect SEO?

By refactoring legacy code and achieving a Largest Contentful Paint (LCP) of 0.5s, Google Search impressions and clicks grew by 70%.

What AI technologies were implemented?

We integrated Sphinx Search for semantic results and built the backend architecture to support Google Gemini for future features like conversational AI.

What were the quantifiable results after 90 days?

The platform saw a 20% increase in conversion rates and a 70% increase in organic traffic from Google.

What is the TLDR (conclusion)?

This project proves that addressing technical debt is a growth strategy. By achieving a Largest Contentful Paint (LCP) of 0.5s and integrating semantic search, the platform moved into the top tier of Core Web Vitals, directly correlating with a massive organic traffic surge.

What technologies and methodologies are involved?

Technologies: PHP, Yii Framework, Sphinx Search Server, MySQL, Cloudflare, Postmark, Google Gemini, Google Analytics, Search Console, Sentry, Bugbug
Methodologies: UX/UI Design, Front-end Dev, Technical SEO, ISO 9001, ISO 27001

How can I find out more?

Lucian Cârlogea

Article written by

Lucian Cârlogea

Senior Software Engineer (with OPTI since 2013). eCommerce, database and backend optimization.

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