OpenCart 3: Experienced Backend Developer (SEO + Speed/CWV)
Total project budget: 80,000 UAH. Payment is staged.
We are looking for an experienced backend developer to create a high-performance online clothing store on OpenCart 3.0.x. We have a fully prepared, high-quality, and responsive HTML/CSS/JS layout that needs to be professionally integrated with the platform.
Project essence: Development of a reliable and fast backend with a key focus on:
- SEO optimization: Clean URLs, hreflang (UA/RU), microdata, sitemap.
- Maximum loading speed: Achieving high Core Web Vitals scores, optimization for less powerful hosting.
- Advanced image handling: Implementation of
- Code quality: Clean code, strict use of OCMOD for all core modifications.
Main technical tasks (briefly):
- Integration of the ready layout into the OpenCart 3 template.
- Implementation of full multilingual support (UA/RU).
- Development/adaptation of custom logic for:
-- Prices: Tying to USD, auto-conversion at the exchange rate, rounding.
-- Dynamic Filtering: Different sets of filters for different product categories.
-- Complex Product Card: AJAX loading of size charts by brand/model, switching between products by color without reloading, limiting the maximum quantity of products in an order (simple setting in the admin panel), etc.
- Integration of necessary modules (search for inexpensive solutions is welcome): Nova Poshta (branch selection), Blog, Bulk product management, etc.
- Standard e-commerce functionality: Cart, Checkout (custom design), Personal account.
Our approach:
- We have prepared a very detailed specification that describes all tasks, contains possible code examples, and offers thoughtful, cost-effective solutions. The full specification will be provided in personal correspondence.
- We value your expertise and are open to discussing the best technical solutions.
- The project is divided into 3 logical stages with separate acceptance and payment for each (details in the specifications).
Who we are looking for:
- A specialist with confirmed experience working with OpenCart 3.
- With an understanding of performance optimization and SEO principles.
- With the ability to write clean, maintainable code (OCMOD).
- Responsible and ready to collaborate.
Budget and Terms:
- Total project budget: 80,000 UAH. Payment is staged.
- Terms are discussed after familiarization with the full specification. Estimated terms: 4–6 weeks (staged, with strict deadlines for stages).
If you are attracted to interesting technical tasks, working with modern technologies (AVIF/WebP), and you are confident in your abilities – please write to us to receive the full Technical Specification.
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60 days601 USD
60 days601 USD
Good evening. I have experience in creating internet resources of various complexity, as well as solving problems, improvements, and creating websites on OpenCart, WordPress, and others. I use PHP, Python, and other languages and technologies depending on the task.
I can provide examples of my work if needed. Write to me, and we will discuss the details.
Similar completed project: Зміни та допрацювання на сайті Opencart 3
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20 days601 USD
2295 73 0 20 days601 USD
Good day, I have been working in this field for more than 9 years, I have experience: php (symfony, laravel, OpenCart, wordpress), javaScript (vue, react, nuxt, nextJs, jquery), html, css (SASS/SCSS), sql (PostgreSQL, MySQL). I am ready to complete this project, with quality and in a short time. Examples of recently completed projects: https://rsps-server.com/ https://asgard-ksm.com.ua/ https://iheal.com.ua/ https://lingvanex.com/ https://cohntm.com/
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60 days601 USD
796 3 1 60 days601 USD
Good day!
I have thoroughly reviewed your project. I am very impressed with your systematic approach — detailed technical specifications, clear understanding of technical requirements, and emphasis on SEO and performance. I am ready to take on the implementation of the backend part of your online store on OpenCart 3.
My key competencies for this project:
OpenCart 3.0.x: Deep understanding of architecture, experience in creating complex custom solutions
SEO and speed: Implemented projects considering Core Web Vitals, image optimization (WebP/AVIF), clean URLs
…
OCMOD: Used exclusively for core modifications — ensuring the system's updatability
Complex business logic: Experience in implementing dynamic pricing, AJAX filters, complex product card logic
My proposals for implementation:
Phased approach: I fully support dividing the work into 3 phases with clear deadlines and acceptance criteria
Technical approach:
Clean code with strict adherence to OCMOD
Performance optimization at the template, database, and caching levels
Implementation with srcset/sizes and prioritization of AVIF/WebP
Flexible system of filters and dynamic pricing
Budget and timelines:
A budget of 80,000 UAH is quite acceptable for the stated scope of work
A timeline of 4-6 weeks is realistic with a detailed technical specification
I am ready to immediately review the full technical specification to form the final work plan and schedule by phases.
My portfolio:
https://portfoliolaravel-production-7f98.up.railway.app/
Freelancehunt
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30 days601 USD
2108 47 0 30 days601 USD
OpenCart Expert | Full-Stack eCommerce Developer | 8+ years of experience
🚀 I help businesses turn ordinary online stores into *selling machines* based on OpenCart. Over 8 years of work, I have completed more than 120+ projects — from custom themes and modules to integration with CRM, 1C, payment systems, and logistics.
🧩 What I can do:
🔧 Development and refinement of modules of any complexity (including custom business logic)
🎨 Responsive layout and UX improvements** to increase conversion
🔌 Integrations with APIs** (CRM, ERP, payments, deliveries, marketplaces)
… 🚀 Optimization of loading speed** and SEO adaptation
🛠 Migrations between OpenCart versions, data migrations
🧪 Testing, debugging, cleaning from bugs and viruses
🔒 Strengthening the security of stores
💡 Why choose me:
✅ Clear deadlines and transparent communication
✅ Understanding of the eCommerce business, not just code
✅ Willingness to urgently connect and "resolve" the project
✅ Long-term cooperation — many clients have been working with me for years
🛒 Platforms and technologies:
OpenCart (v1.5–v4), PHP, MySQL, JavaScript, HTML/CSS, jQuery, Twig, VQMod/OcMod, API integrations, 1C, RetailCRM, KeyCRM, SalesDrive, Prom, Rozetka, Nova Poshta, LiqPay, Privat24, PayPal, and others.
📩 Write to me — let's discuss your project and make it profitable.
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4 days99 USD
5491 77 3 4 days99 USD
Hello!
My experience with OpenCart is 15 years.
I write clean code, without hacks and bugs. Everything according to OpenCart documentation.
I develop custom modules of any complexity. Usually, I write my own solutions, rather than using third-party ones.
I have a great understanding of event principles and modifiers in OpenCart.
It would be interesting to collaborate!
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20 days601 USD
609 2 1 20 days601 USD
Good day.
I have confirmed experience in integrating adaptive layouts in OpenCart 3, implementing custom logic through OCMOD, optimizing performance and SEO settings. I guarantee clean and maintainable code, correct operation of multilingual functionality, modern image processing (picture/srcset, WebP/AVIF), and attention to Core Web Vitals even on limited hosting.
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22 days557 USD
4429 80 1 4 22 days557 USD
Trust a professional with over 10 years of experience! The rate and deadlines are current! I will be happy to cooperate! Experience in commercial development of online stores on CMS, business portals, and corporate websites - 11 years! +CMS: WordPress (+Woocommerce) PrestaShop / Opencart / Joomla / Bitrix / MODX / DLE / Shopify php / html / css / js / Mysql, PhotoShop / Figma Examples of work (from scratch, turnkey): https://wildandorganic.com/ https://cryptosignals.org/ https://ecnbot.com https://locs-ua.com/ https://www.grower.com.ua/ https://www.alternativemedicine.com.ua/ https://silkkiss.ua/ https://nordtrade.online/ https://v12coffee.com.ua/franchise/ https://smrtalgo.com/ https://sengero.no/ https://beautybysim.no/ https://sonatagalleri.com/ https://www.solmy-realestate.com/ https://www.emmanuel.com.ua/ https://www.onsitecomputersinc.com/ https://express-tehbud.com/ https://korostenporcelain.com.ua/ https://sladok.com.ua/ https://pricemds.com/ https://picupmedia.com/ https://www.serasar.com/
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11 days601 USD
12912 67 0 11 days601 USD
Hello! I will complete your task quickly and efficiently. Please send the full specifications. Thank you.
My portfolio: https://freelancehunt.com/ua/freelancer/romas6ka.html#portfolio
Write to me, I will start working today. I will be happy to collaborate with you!
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де можна подивитися макети ?
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Здравствуйте, Алексей!
У моего проекта есть несколько ключевых особенностей, помимо стандартной разработки на OpenCart, поэтому перед отправкой полного ТЗ (оно очень детальное) я хотел бы уточнить несколько моментов по вашему опыту:
Современная оптимизация изображений и скорости: В ТЗ большое внимание уделено максимальной скорости загрузки (Core Web Vitals) и продвинутой работе с изображениями. В частности, планируется реализация вывода через тег
<picture>сsrcsetиsizes, поддержка форматов AVIF и WebP (я предполагаю гибридный подход: ручная вставка HTML-кода для ключевых изображений и автоматическая генерация WebP для остальных). Насколько вы знакомы с этими технологиями и есть ли у вас практический опыт их внедрения на OpenCart для достижения высоких показателей PageSpeed?Продвинутое SEO: Проект двухъязычный (UA/RU). Насколько вы опытны в корректной настройке
hreflangна всех типах страниц OpenCart и в настройке современных Sitemap (индексные файлы, включениеhreflangв карту сайта)?Подход к разработке: Для меня важно, чтобы все модификации ядра выполнялись через OCMOD для чистоты кода. Также я предпочитаю использовать проверенные готовые модули там, где это оправдано, чтобы оптимизировать бюджет ("Принцип Экономии"). Насколько вам близок такой подход?
Если ваш опыт и подход соответствуют этим ключевым моментам, я с радостью отправлю вам полное ТЗ для детального ознакомления и вашей оценки.
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