Mark J.

Senior Web Developer | WordPress, Shopify, Webflow, MERN | 8+ years on Upwork

150+ contracts, $200K+ earned, 100% JSS, Top Rated.

I've built and contributed to sites for Enfusion, GOBI Cashmere, Steffi Graf, Not Pot, Joovv, Allbirds, Bonsai, Daybreaker, WorldwideERC, and GoLoadUp across fintech, luxury DTC, funded SaaS, nonprofits, and creative brands.

The work ranges from custom Liquid variant configurators and headless Shopify (Next.js) to Elementor Pro builds, Webflow CMS architecture, and full MERN apps with OpenAI and Claude API
integrations. I'm equally comfortable in a Figma-to-WordPress production sprint or debugging a webhook that's silently dropping form submissions.

What I actually get hired for: sites that work after launch. The form connects. The pixel fires. Checkout doesn't break on mobile Safari. You can edit a headline without calling me.

Platforms and stacks:

• WordPress + Elementor Pro, WooCommerce, ACF, custom themes
• Shopify custom Liquid, headless (Next.js), variant logic,
  Klaviyo, ReCharge
• Webflow CMS, Memberships, Logic, custom code embeds
• Squarespace, Wix, Framer when those are the right fit
• MERN stack: React, Next.js, Node, Express, MongoDB
• AI integrations: OpenAI, Claude API, RAG, agent workflows
• Stripe, HubSpot, Mailchimp, Make, Zapier
• Technical SEO, Core Web Vitals, schema markup, GA4, GTM, Meta Pixel

If you've been burned before, send me what you have. I'll tell you honestly what I'd do differently.

Fixed price or hourly. Available now.