BigCommerce powers roughly 60,000 live stores and sits in a three-platform race with Shopify and Adobe Commerce for mid-market retail. The platform behaves differently from its competitors under the hood, which is why agencies that succeed on Shopify sometimes struggle with their first BigCommerce enterprise build. Stencil themes use Handlebars templating instead of Liquid. Catalyst, the platform's reference headless stack, runs on Next.js 16 and Node.js 24 or higher. The B2B Edition surfaces features like account hierarchies, price lists, and quote management that have no direct Shopify equivalent without third-party apps. Each of these differences changes what questions a buyer should ask, what timeline is realistic, and what the invoice looks like at the end.
This reference indexes seven topical articles that go deeper than the generic listicles currently ranking on each query. Use the guide to find the decision you are making right now: picking an agency, picking an architecture, scoping a B2B build, pricing a project, cleaning up checkout conversion, integrating an ERP, or moving a Shopify store onto BigCommerce. Each article is sourced from public BigCommerce platform documentation, current BigCommerce product pages, and cross-checked against 2026 market data rather than rewritten agency marketing.
Theme customization versus custom development
Theme customization means adjusting Stencil's Cornerstone reference theme or a purchased marketplace theme using Handlebars templates, SCSS, and the Page Builder widget system. Custom development adds API-backed features, middleware, headless storefronts, custom checkout flows via the Checkout SDK, or fully bespoke Catalyst builds. The line between the two is where agencies often blur their scopes. A $4,000 proposal to "customize our theme" and a $45,000 proposal to "build a custom storefront" can both be honest. They can also both be misleading. The article on how to choose a BigCommerce development agency walks through the questions that force a clear answer.
B2B and DTC projects scope differently
Direct-to-consumer builds lean on Cornerstone, Page Builder, one checkout flow, and a small set of marketing integrations. Timeline for a DTC build lands somewhere between six weeks and four months depending on integration count and merchandising depth. B2B builds pull in the B2B Edition with its buyer portal, company accounts, up to five-layer account hierarchies, quote management, purchase orders, sales rep masquerade, and ERP integrations that have to reconcile contract pricing against catalog pricing. Timeline doubles. Cost more than doubles. The detailed breakdown sits in the BigCommerce B2B setup guide and the customization cost article.
All seven topic guides
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How to choose a BigCommerce development agency
An eight-criteria evaluation framework, honest cost benchmarks by project type, eight questions to ask before signing, red flags that appear in the proposal, and the contract clauses most agencies hope you skip. The longest article on the site.
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Stencil vs headless BigCommerce
What Stencil actually is, what Catalyst replaces, the Node and Next.js version split that trips up teams running both, operational cost differences between the two paths, and a decision framework for when a headless rebuild is not worth the invoice.
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BigCommerce B2B setup
B2B Edition versus native B2B features, the five-level company account hierarchy announced in March 2025, price lists and customer group pricing, quote and purchase order workflows, sales rep masquerade, shared shopping lists, and the B2B-specific checkout requirements that break generic agency assumptions.
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BigCommerce customization cost in 2026
Real 2026 cost bands across theme customization, custom app development, full DTC builds, and B2B builds. Regional hourly rate benchmarks, ongoing maintenance retainers, and the hidden line items most agency proposals bury in the optional-scope section.
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BigCommerce checkout optimization
Native Optimized One-Page Checkout limitations, what the Checkout SDK can and cannot do because of its CORS boundary, payment gateway choices that actually affect conversion, and the checkout customization constraints that are unique to Stencil themes.
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BigCommerce API integrations
REST Management API versus GraphQL Storefront API capabilities, webhook payload structure and delivery behavior, ERP integration patterns for NetSuite, SAP Business One, and QuickBooks, CRM patterns for Salesforce and HubSpot, rate limiting, and when middleware beats a direct integration.
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Migrating from Shopify to BigCommerce
A deeper walkthrough than the current top-ranking BigCommerce support article. Liquid to Handlebars template mapping, Shopify metafields to BigCommerce custom fields and modifiers, the 600 variant cap, 250 option value cap, Shopify apps with no BigCommerce equivalent, a worked 301 redirect mapping table, and a 30, 60, 90 day post-migration QA checklist.
Who this guide is for
Ecommerce operators, directors of engineering, and founders evaluating BigCommerce as a build target or a replacement platform. Content focuses on operational specifics, real tools, and current platform behavior rather than generic retail advice. Every article carries through the same design and the same publisher. Numbers get dates. Claims get sources. When the platform changes, the articles are updated and timestamped.