Mario Cueto

Summary

Senior Shopify Engineer. I build the storefront and everything around it: themes, apps and Functions, the tests that decide what stays, and the Workers underneath.

Most of my work is for direct-to-consumer brands in health, wellness and beauty, where the product page and the cart carry the business. I've also shipped headless builds on Hydrogen, funnels on Webflow and sites on WordPress, so I pick the platform for the job, not the other way around.

What I build

Theme architecture

Liquid · JSON templates · Metafields · Metaobjects

Shopify apps

Admin GraphQL API · Functions · App extensions

Edge automation

Cloudflare Workers · Webhooks · Cron Triggers

CRO & experimentation

Intelligems · Split URLs · Theme variants

Subscriptions & AOV

Recharge · Skio · Rebuy · Automatic discounts

Tracking & attribution

Elevar · GTM · Northbeam · Meta & TikTok pixels

Performance & tooling

Lighthouse · Core Web Vitals · Theme Check

Selected work

• WinonaShopify · shop.bywinona.com

  A custom theme for a telehealth brand serving women 30+. Calm and clinical on the surface, built to sell bundles underneath.

  • Custom Online Store 2.0 theme built from a blank skeleton
  • Build-your-own-bundle bar: 10%, 15% and 20% off at 2, 3 and 4 items
• Alpha LionShopify · www.alphalion.com

  A dark, performance-first storefront where the product page does the heavy lifting: subscriptions, flavor builders and per-serving math.

  • Subscribe & Save on every PDP, with first-order savings up to 62% through Recharge
  • Multi-flavor builder: shoppers add flavors one by one before the cart unlocks
• OnélogyShopify · onelogy.com

  A dark, product-first storefront for freeze-dried skincare, with subscriptions wired into every product form.

  • Custom Gradibase theme with Recharge subscriptions and selling plans
  • Sticky buy box with details, how-to, ingredients and results tabs
• Alpha Lion · Burn2O funnelWebflow · try.alphalion.com

  A paid-traffic funnel for Burn2O, built in Webflow so the team can iterate fast, that hands every order to Shopify checkout.

  • Long-form landing page for paid traffic, shipped and iterated in Webflow
  • Attribute-driven component layer (al-*) that builds the Shopify cart and sends shoppers to checkout
• Happy MammothShopify · store.happymammoth.com

  A Horizon-based storefront for a brand trusted by more than 3.3 million women, built around a quiz, quantity tiers and subscriptions.

  • Quantity tiers on the PDP: 1, 2 or 4 jars with savings up to $100
  • Hormone quiz promoted site-wide, from the announcement bar to the header
• SansShopify Hydrogen · www.livesans.com

  A headless storefront on Shopify Hydrogen and Oxygen, where the cart pairs every purifier with a filter subscription.

  • Headless storefront on Shopify Hydrogen, deployed on Oxygen
  • Cart drawer that pairs the purifier with a filter subscription and a cross-sell

Apps, Functions and Workers

• Big DiscountsEmbedded Shopify app
• Build Your Own BundleDiscount Function + admin app
• Cart reward ladderDiscount Function
• Website requests botCloudflare Worker + Slack app
• GLP-1 discount APICloudflare Worker
• Checkout social proofCheckout UI extension
• Promo FunctionsDiscount Functions
• Landing page bundles & giftsDiscount Function
• Live purchase proofCloudflare Worker
• Funnel edge routerCloudflare Workers
• Social proof syncNightly job
• A/B product namesCart Transform Function