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Shopify Plus development
Checkout Extensibility, Functions, Flow, B2B, Scripts, Pixels, Customer Accounts and app extensions. Custom storefronts built from Figma with Vite, TypeScript, SCSS or Tailwind, and GitHub Actions.
Available for integration and migration work
MaksymMariukhnik
E-commerce integration engineer · Senior full-stack developer
I connect e-commerce systems that were never built to talk to each other, and move live stores between platforms without losing orders, customers or search rankings.
- 17 years in commercial web development
- e-commerce since 2009
- 100+ projects
- remote
What I do
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Platform migrations
Shopify, BigCommerce, WooCommerce, CS-Cart and proprietary platforms, in any direction. Products, variants, customers, order history, categories, images and metafields — plus the URL mapping and 301s that keep the traffic.
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API and data synchronization
REST, GraphQL and webhook integrations that keep catalog, pricing, inventory, customers and orders in agreement across stores and external systems.
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Serverless automation
Cloudflare Workers, KV, D1 and scheduled jobs. Integration work that runs on its own, with no server to maintain and no cron box to forget about.
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Third-party integrations
Recharge, Klaviyo, Yotpo, Klevu, Algolia, Searchanise, Mailchimp, Stripe, ShipStation, UPS, USPS and FedEx.
Selected work
Multi-store Shopify synchronization
Shopify PlusOne master store, five regional storefronts, one source of truth.
A centralized integration layer keeps products, discounts, orders, customers and inventory in step across six Shopify stores. REST and GraphQL where each fits, Cloudflare Workers for the logic, KV and D1 for state, and scheduled processing for the parts that should never run inline with a request.
E-commerce platform migrations
MigrationLive stores moved between platforms with the order history intact.
Full production migrations across WooCommerce, BigCommerce, Shopify and proprietary platforms: products, variants, customers, historical orders, categories and collections, images, custom fields and metafields.
Technical SEO is part of the migration, not a follow-up. Where URL structures cannot survive the move — BigCommerce nested categories do not map cleanly onto Shopify collections — the redirects carry the equity across.
- 2,000products migrated
- 15,000historical orders
- 301redirect mapping
Supplier and dropshipping sync
Data pipelinesAPI calls where they fit, bulk processing where the catalog is too large for them.
Synchronization pipelines for supplier and dropshipping feeds across Shopify and WooCommerce. The method is chosen per catalog: per-item API calls for small, frequently changing sets, CSV bulk processing where volume would otherwise spend the whole rate limit on a single run.
BigCommerce B2B integrations
B2BBackorders, third-party search and a storefront that behaves for wholesale buyers.
Long-running B2B builds where several interconnected systems have to agree on the same order. Integration compatibility and custom storefront behavior for purchasing workflows that standard themes do not cover.
BigMed.ge — my own product
FounderA multilingual medical directory for finding doctors and clinics, built and run solo.
Full-stack product work: multilingual site architecture, technical SEO, Schema.org structured data, SEO architecture for doctor, clinic, specialty and location pages, and performance optimization — plus ongoing work on how medical content is presented to search engines and AI answer systems.
Stack
E-commerce platforms
- Shopify
- Shopify Plus
- BigCommerce
- CS-Cart
- WooCommerce
- WordPress
Shopify ecosystem
- Admin API
- Storefront API
- GraphQL
- Webhooks
- Checkout Extensibility
- Functions
- Flow
- B2B
- Pixels
- Customer Accounts
- Theme development
- Extensions
Languages and APIs
- PHP
- JavaScript
- TypeScript
- SQL
- GraphQL
- REST
Frameworks and frontend
- Laravel
- Liquid
- Alpine.js
- Tailwind CSS
- SCSS
- Vite
Cloud and serverless
- Cloudflare Workers
- KV
- D1
- Cron Triggers
Integrations
- Recharge
- Klaviyo
- Yotpo
- Klevu
- Algolia
- Searchanise
- Mailchimp
- Stripe
- ShipStation
- UPS
- USPS
- FedEx
Engineering
- Git
- GitHub Actions
- Code review
- Solution architecture
- Task estimation
- Performance optimization
- Technical SEO
Experience
2011 — present
Senior full-stack / e-commerce developer
Absolute Web · remote
Long-term collaboration with an international e-commerce agency, contributing to 100+ commercial projects across Shopify, Shopify Plus, BigCommerce, CS-Cart and WordPress/WooCommerce.
- Complex e-commerce builds across frontend, backend and integration layers.
- Migrations between Shopify, BigCommerce, WooCommerce and proprietary platforms.
- REST, GraphQL and webhook integrations; automated sync for products, pricing, inventory, customers and orders.
- Serverless integration solutions on Cloudflare Workers, KV, D1 and scheduled jobs.
- Custom CS-Cart themes and add-ons.
- Solution design, code review, estimation and risk assessment; technical support for other developers.
- Direct technical communication with project managers and clients.
2026 — present
Founder and full-stack developer
BigMed.ge
A public multilingual medical platform for finding doctors and clinics. Product development, frontend architecture, multilingual site structure, technical SEO, Schema.org, performance, and AI/LLM discoverability of medical content.
2009 — 2011
Web developer
Lipen Furniture House · Melitopol, Ukraine
Built the company's online furniture store on CS-Cart from concept to launch: custom theme, custom modules, technical SEO, and ongoing maintenance and feature work after launch.
2007 — 2009
Industrial automation / PLC programmer
Melitopol, Ukraine
Programmed and configured the Siemens and Omron PLC systems controlling an automated electroplating production line: control logic, equipment sequences, operating modes and operator workflows.
Background
- Education
- Bachelor's degree, Computer Systems and Networks Zaporizhzhia Institute of Economics and Information Technologies, 1999 — 2004. Computer systems and networking, network administration and design, wireless networks, C++, microcontrollers.
- Certification
- Shopify — Liquid Storefronts for Theme Developers May 2025 — May 2027
- Languages
- Working languages: Ukrainian, Russian, written English Ukrainian and Russian — fluent. English — intermediate reading and written technical communication; limited spoken communication.
Contact
Tell me what needs to talk to what.
Send the platforms involved, what has to move between them, and your deadline. You will get an honest estimate and the approach I would take — including when the answer is that the work is not worth doing the way it was framed.