21phi

Shopify Plus & Hydrogen development services

One embedded team for DTC brands on Shopify Plus: Hydrogen storefronts, design, analytics, CRO, email and SMS, SEO and AI search, working as one system instead of separate vendors.

Shopify Plus & Hydrogen

Shopify Plus development for brands that have outgrown app-heavy setups. We rebuild the commerce foundation on Hydrogen with clean storefront logic and custom integrations, so your team gets a faster store and more control without stacking more apps on top of the problem.

01
  • Hydrogen development
  • Shopify Plus builds
  • Headless storefronts
  • Replatforming & migrations
  • Sanity CMS setup
  • Shopify Markets
  • Checkout extensions
  • Custom API integrations
Shopify Plus & Hydrogen

Design & UX

Premium Shopify design should do more than look good. We build visual systems, product pages and reusable patterns that sharpen the brand and guide customers to convert, with AI-assisted product imagery and motion when a shoot can't cover everything.

02
  • Ecommerce UX/UI design
  • Product page design
  • Design systems
  • Prototyping
  • Visual direction
  • AI-assisted imagery & motion
Design & UX

Analytics & Attribution

Growth breaks when the numbers can't be trusted. We set up clean GA4, GTM and Shopify pixel tracking with a solid event taxonomy, then use Amplitude to show funnels, drop-off and retention. Every week we walk you through what changed and why, so decisions run on data, not opinions.

03
  • GA4 & GTM setup
  • Shopify pixel implementation
  • Event taxonomy
  • Amplitude funnels & retention
  • Cohort & repeat-purchase analysis
  • Weekly performance reviews
Analytics & Attribution

CRO & A/B Testing

Conversion improvement shouldn't be random. We turn customer behavior, UX friction and merchandising gaps into a clear A/B testing roadmap, and we read results by segment instead of trusting averages.

04
  • UX & conversion audits
  • A/B testing
  • Customer journey mapping
  • Landing page optimization
  • Cart & upsell optimization
  • Merchandising optimization
CRO & A/B Testing

Email & SMS

Your owned channels should feel like part of the store, not a separate agency. We run Klaviyo and SMS end to end: welcome, browse and cart abandonment flows, launch campaigns and win-back, with fewer and more useful messages and every change tested.

05
  • Klaviyo management
  • Flows & automations
  • Launch & drop campaigns
  • Segmentation
  • SMS marketing
  • Win-back & retention
Email & SMS

SEO & AI Search

Search performance should survive redesigns and show up wherever customers ask. We build SEO into the storefront foundation and make your catalog readable for AI agents, so you rank on Google and get recommended, and bought, in ChatGPT and other AI assistants.

06
  • Technical SEO audits
  • SEO-safe migrations
  • Core Web Vitals
  • Structured data (schema)
  • AI search optimization (GEO)
  • Agentic commerce readiness
  • Content & link strategy
SEO & AI Search

Ongoing Support

The real work starts after launch. We work as your embedded commerce team, in place of a separate developer, email agency and analyst, and keep improving the store, the launches and the growth work week after week.

07
  • Discovery & roadmap
  • Tech stack audit
  • Launch planning & QA
  • Accessibility compliance
  • Ongoing improvements
  • Operations support
Ongoing Support