Custom Shopify & BigCommerce Development Built for Speed, Frictionless Checkout, and High-Growth Scale
Custom Shopify and BigCommerce development replaces bloated marketplace apps and generic themes with bespoke Liquid or Stencil storefronts, purpose-built private apps, and Shopify Functions or Checkout UI Extensions—cutting third-party JavaScript, enabling native B2B pricing logic, and connecting stores directly to ERPs so merchants keep full code ownership while scaling checkout performance.
We build bespoke Liquid and Stencil themes, develop custom private apps, and engineer headless storefronts that eliminate SaaS constraints and drive top-tier conversion rates.
- 23+ Years of Software Innovation
- Engineering robust web platforms since 2002.
- Speed Obsessed
- Eliminating app bloat to guarantee 90+ PageSpeed scores on mobile.
- Custom App Capabilities
- 100+ secure custom integrations deployed across cloud infrastructure.
What Track Record Backs Our Shopify & BigCommerce Engineering?
420+ Delivered Platforms
Deep domain expertise in ecommerce, payment workflows, and business automation.
97.4% Client Retention
Proven track record delivering maintainable, high-converting digital storefronts.
Enterprise-Ready
Full integration with enterprise ERPs, CRMs, and custom fulfillment networks.
Why Do Standard Shopify & BigCommerce Setups Hit Ceilings?
While Shopify and BigCommerce accelerate time-to-market, off-the-shelf stores quickly suffer from critical limitations:
Third-Party App Congestion
Installing 15–25 separate marketplace apps injects massive JavaScript bloat, degrading mobile conversion and Core Web Vitals.
Template Rigidity
Generic themes make it difficult to implement custom visual branding, product customizers, or complex B2B purchasing workflows.
Rigid Checkout Boundaries
Inability to run custom backend discounting logic, validation rules, or localized compliance without custom app extensions.
Disconnected Enterprise Systems
Fragile third-party connectors that fail during flash sales, resulting in out-of-sync inventory and lost revenue.
What Custom Shopify & BigCommerce Capabilities Does egas.digital Deliver?
Custom Theme Development (Shopify Liquid & BigCommerce Stencil)
- Pixel-perfect, zero-bloat custom themes built from scratch using modern frontend workflows (Tailwind CSS, TypeScript, Alpine.js).
- Native Shopify OS 2.0 section architecture for seamless merchant drag-and-drop customization.
Custom Private & Public App Development
- Purpose-built private and public apps engineered using Remix, Node.js, GraphQL Admin APIs, and Laravel.
- Shopify Functions and Checkout UI Extensions for custom validation, automated B2B discount tiers, and bespoke payment routing.
Headless Commerce & Multi-Platform Architecture
- Decoupled storefronts using Next.js / React connected to Shopify Storefront API and BigCommerce GraphQL.
- Ultra-low latency edge hosting (Cloudflare / Vercel) for sub-second page transitions across global markets.
B2B Wholesale & Omnichannel Ecosystems
- Shopify Plus B2B and BigCommerce B2B Edition custom implementations with tiered pricing, draft quotes, and payment term controls.
- Custom middleware connecting stores directly to SAP, Totvs, Bling, Tiny ERP, and custom warehouse management systems.
What Does a Clean Shopify & BigCommerce App & Checkout Architecture Look Like?
Customer Storefront (Liquid / OS 2.0 Sections)
Shopify Functions & Checkout UI Extensions (Wasm / Webhook)
Custom Private App (Node.js / Laravel)
Enterprise ERP / WMS Sync
Payment & Anti-Fraud Engine
How Did We Consolidate Apps and Re-Architect a Shopify Theme?
The Challenge
A high-volume lifestyle brand on Shopify suffered a 4.9-second mobile load time due to 22 installed third-party apps, resulting in high checkout abandonment and rising monthly app subscription costs.
The Solution by egas.digital
- Built a custom, lightweight Shopify OS 2.0 Liquid theme from scratch.
- Consolidated the functionality of 16 disparate marketing and utility apps into a single, high-performance custom private app hosted on AWS.
- Implemented Shopify Functions for native, server-side bundle pricing and dynamic cart upsells.
Results
- Mobile page load speed decreased from 4.9s to 1.1s (94+ PageSpeed score).
- Overall checkout conversion increased by +26.4%.
- Eliminated over $1,400/month in recurring third-party SaaS app fees.
What Is Our 5-Step Shopify & BigCommerce Delivery Workflow?
- 1
Tech Stack & App Audit
Reviewing third-party app dependencies, tracking pixels, and conversion drop-off points.
- 2
Component Architecture & UX Prototyping
Designing modular Liquid/Stencil sections and specifying custom API endpoints.
- 3
Staging & Git-Controlled Development
Developing directly in isolated staging environments with GitHub CI/CD tracking.
- 4
End-to-End QA & Device Stress Testing
Rigorous cross-browser, accessibility (WCAG AA), and mobile checkout testing.
- 5
Zero-Downtime Deployment & Analytics Verification
Seamless live cutover with complete tracking pixel (GA4, Meta CAPI) verification.
Frequently Asked Questions
Can you build custom features without slowing down our store?
Yes. We replace bloated JavaScript widget apps with native Shopify Functions, Checkout UI Extensions, and server-side logic that execute instantly without browser overhead.
Do you migrate data from Magento, WooCommerce, or custom platforms?
Yes. We migrate complete product databases, customer accounts, order histories, and execute 301 redirect mapping to protect existing SEO rankings.
Do we own the code for custom private apps?
Yes. All custom apps, scripts, and private repositories are 100% owned and controlled by your business.
Ready to Build a Faster, Higher-Converting Storefront?
Consult directly with Fabio Egas and the senior developers at egas.digital.
Confidentiality guaranteed. Direct engineer-to-engineer scoping.
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