Senior Shopify Developer

Mellow Sleep is one of the fastest growing consumer brands in the U.S., scaling from $0 to nine figures in revenue in under two years.

We are the #1 Home brand on TikTok Shop and are rapidly expanding across major retail and commerce channels, including Target, QVC, Walmart, Amazon, and wholesale.

As we continue to scale, we are looking for a Senior Shopify Developer to take technical ownership of our Shopify ecosystem and the integrations that power a high volume DTC and omnichannel operation.

You will be the technical owner of our Shopify Plus storefront and connected ecommerce systems. This is not a theme tweaks development role.

You will be responsible for architecting, building, and maintaining the infrastructure behind a $300M+ ecommerce brand operating simultaneously across DTC, TikTok Shop, Amazon, retail, and wholesale channels.

You will work closely with our growth, marketing, operations, product, and finance teams to ensure our commerce infrastructure is fast, reliable, scalable, and built to support continued aggressive growth. You will also mentor and review the work of junior Shopify developers on the team.

Shopify Architecture and Development

Full ownership of Shopify Plus architecture, performance, and custom development

Custom Liquid, JavaScript, React, Node.js, and Hydrogen development as needed

Checkout optimization and conversion focused development

Site speed, Core Web Vitals, and overall storefront performance

QA, staging environments, testing, and deployment pipelines

Integrations and Commerce Infrastructure

TikTok Shop integration, including catalog sync, order routing, and inventory management

3PL integrations and fulfillment logic across multiple warehouses

Custom Shopify apps, APIs, webhooks, and middleware

Integrations with platforms such as AfterSell, Loox, Triple Whale, Klaviyo, and other core ecommerce tools

Data flows between Shopify, ERP, fulfillment, analytics, and reporting systems

Technical troubleshooting across the entire ecommerce stack

Omnichannel and International

Multi storefront management across the U.S., Canada, and future international markets

Multi currency and localization infrastructure

Support for DTC, TikTok Shop, Amazon, retail, and wholesale channels

Inventory and order routing logic across channels and fulfillment locations

Experience with any of the following is a major plus:

Amazon MCF or multi channel fulfillment routing

Faire, wholesale portals, or Shopify B2B

ERP integrations such as NetSuite

TikTok Pixel, Meta CAPI, and server side tracking

Subscription and reorder infrastructure

Retail EDI integrations, particularly Target or Walmart

Complex inventory allocation and multi warehouse routing

High volume promotional events and traffic spikes