Shopify Store Development
Custom Shopify and Shopify Plus stores built to convert: theme development, product and catalog setup, integrations and a fast, mobile-first foundation.
Shopify Development
Shopify & Ecommerce Agency
Shopify Store Development & Ecommerce Growth Agency
ERNIX helps Shopify brands build, optimize and grow high-performing ecommerce stores through Shopify development, SEO, conversion optimization and digital marketing. One senior team, from first storefront to full-scale growth.
Every brief answered within one business day · Working with merchants in every timezone
$35.8K/mo
Monthly sales after store rebuild
Rachel’s Texas Kitchen — Shopify
8.73%
Store conversion rate achieved
Rachel’s Texas Kitchen — Shopify
+70%
Mobile traffic growth
Unleashed Apparel — Shopify
+50%
Social sales growth
Unleashed TikTok Shop — Social commerce
What we do
One agency for the full life of your store
From a first Shopify build to redesigns, search visibility, paid funnels and social commerce — every service below is delivered by the same senior team, with your revenue as the only metric that matters.
Shopify Store Design
Product pages, collections and navigation designed around how shoppers actually browse — mobile-first, conversion-focused, on-brand.
Shopify DesignShopify Store Redesign
Outdated, slow or under-converting? We rebuild your store and protect the SEO equity you’ve already earned during the transition.
Shopify RedesignShopify SEO
Technical SEO, product and collection optimization, structured data and content strategy that compounds organic traffic month after month.
Shopify SEOShopify Marketing
Paid media funnels, social commerce, email flows and analytics that turn store traffic into repeat revenue.
Shopify MarketingShopify Plus Development
Enterprise-grade storefronts: custom checkout logic, high-volume catalogs, integrations and automation for brands outgrowing standard plans.
Shopify PlusTikTok Shop
Full TikTok Shop setup synced to your Shopify catalog — product listings, omnichannel fulfillment pipelines and social commerce strategy.
TikTok ShopConversion Rate Optimization
Product pages, checkout, trust signals and mobile experience tuned so a higher share of the visitors you already have actually buy.
Conversion OptimizationEcommerce Development
Store-adjacent builds that support your business: booking platforms, web apps, dashboards and the custom integrations your operation needs.
Ecommerce Development
Why ERNIX
A senior team that ships, not a ticket queue
ERNIX is a deliberately lean agency based in Grandview, Dallas, Texas, working with ecommerce brands internationally. There are no hand-offs to junior juniors and no account-manager middle layer — the people who scope your project are the people who build it.
We’ve shipped real stores for real brands — from a Texas kitchen shop that scaled to $35.8K in monthly sales, to a streetwear label growing +70% in mobile traffic, to full app ecosystems for rental businesses.
- Senior engineers and designers only. Strategy, build and growth from one accountable team.
- Ecommerce first. Shopify, Shopify Plus, TikTok Shop and the CRO work around them — not a generalist agency wearing an ecommerce hat.
- You own everything. 100% of source code, design files and store configuration transfers to you at launch.
- Weekly working demos. You review a live build every sprint — no black boxes, no surprises at handoff.
- 30-day post-launch warranty on every project, with optional growth retainers after that.
How we work
Four stages. No guesswork.
A predictable, sprint-based delivery model with fixed milestones and weekly staging releases.
01 / DISCOVER
Discovery & Strategy
We audit your current performance, analyze competitors and map a clear technical roadmap with fixed milestones.
02 / DESIGN
UX/UI Design & Systems
High-fidelity Figma prototypes and a component design system, responsive across desktop, tablet and mobile.
03 / BUILD
Engineering & QA
Clean, modular builds with multi-browser testing, security checks and Core Web Vitals performance tuning.
04 / GROW
Launch & Scale
Zero-downtime go-live, Search Console and GA4 wired in, marketing funnels live and conversion metrics optimized.
Selected work
Real stores. Documented results.
A selection of recent builds and growth engagements. Every result below is from a live ERNIX project.
Shopify · Ecommerce scaling
Case Study
Rachel’s Texas Kitchen
Complete storefront redesign and checkout conversion architecture for a Texas food brand.
$35.8Kmonthly sales
8.73%conversion rate
701orders / month
Social commerce · TikTok Shop
Case Study
Unleashed TikTok Shop
Full Shopify catalog synchronized with TikTok Shop in an automated omnichannel pipeline.
+50%social sales
100%auto-sync
18.4Kinteractions
FlutterFlow · Mobile app
Case Study
FC Rentals Booking App
Native mobile booking experience with interactive fleet search and automated driver verification.
1,200+bookings / mo
4.9★app rating
<3 tapsbooking flow
Built to be found, tuned to sell
A store is a platform, not a destination
Launch is the beginning. The compounding work happens in search visibility, conversion efficiency and the marketing engines that feed the store.
Shopify SEO & Organic Growth
Technical audits, product and collection SEO, structured data and content that earns traffic without ad spend. No ranking guarantees — just the fundamentals done properly.
Explore Shopify SEOConversion Optimization
CRO raises the share of visitors who buy: product pages, checkout, trust signals and mobile experience, measured against the numbers you already have.
Explore CROEcommerce Marketing
Paid media funnels, social commerce, email retention and analytics — acquisition and retention working from one strategy.
Explore Ecommerce Marketing
Client words
What partners say about working with us
★★★★★
“The sales dashboard doesn’t lie — we watched our monthly numbers climb steadily to $35.8K since ERNIX took over our Shopify store. Clear communication, fast turnarounds, and measurable sales growth from day one.”
Founder, Rachel’s Texas Kitchen
✓ Verified e-commerce client
★★★★★
“ERNIX rebuilt our storefront and checkout in under six weeks. They seamlessly linked our TikTok Shop catalog and our online sales surged immediately. The team is hands-on and gets both design and tech right.”
Owner, Unleashed Apparel Shop
✓ Verified storefront client
★★★★★
“The booking platform shipped on time and looked even better than what we had imagined. ERNIX understands both high-level product design and complex booking backend logic. A top-notch partner.”
Founder, FC Rentals LLC
✓ Verified web app client
FAQ
Frequently asked questions
How fast can ERNIX design and launch our project?
Most Shopify storefronts and marketing websites launch within 2 to 4 weeks. Full redesigns, TikTok Shop integrations or custom apps typically run 4 to 8 weeks across structured weekly sprints with a working demo every week.
What technologies and platforms do you build with?
Everything is built on Shopify, Shopify Plus and Liquid, with TikTok Shop integration and Figma for all design systems — a full stack focused entirely on growing your Shopify store.
Do we own 100% of the code and files?
Yes. On project completion and final payment you retain 100% ownership of all source code, Figma design files, store configuration and assets. We never lock clients into proprietary systems.
What happens after our store goes live?
Every build includes a 30-day post-launch warranty covering refinements and bugs. After that we offer monthly growth retainers covering maintenance, technical SEO, feature development and campaign management.
How do you handle revisions and communication?
Asynchronous communication via email or chat, supplemented by weekly live screen-share walkthroughs. You review a real working build every week, so you’re always aligned with progress.
Do you work with brands outside the United States?
Yes — ERNIX is based in Grandview, Dallas, Texas but works internationally. We collaborate across timezones with Shopify merchants and ecommerce brands worldwide, and every engagement runs on weekly demos so distance is never an obstacle.
Budget-friendly pricing
Estimate your project in 30 seconds
From a first store for a new startup to a premium, high-growth ecommerce business — pick what fits and see a transparent, no-pressure range.
1 · Where are you today?
Your first store — launch fast and affordably.
2 · What do you need? (tap to add)
3 · How soon do you want to launch?
Ready to build a store that actually grows?
Tell us what you’re building. We review every brief thoroughly and reply with a tailored scope and pricing breakdown within one business day.
Available globally · Based in Grandview, Dallas, Texas