BigCommerce App Development Services

App Development
For BigCommerce

Private apps, marketplace apps, Page Builder widgets and the API work behind them.

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We publish apps on the BigCommerce marketplace rather than only installing other people’s. That is the whole difference here: when your requirement needs something that does not exist yet, building it is ordinary work rather than a special project someone learns on your budget.

What we build

Private apps — functionality specific to your store. No marketplace review, no multi-tenancy overhead, and the fastest route to solving an actual problem.

Public marketplace apps — full OAuth, multi-tenant data isolation, billing and the review process, for when distribution is the point.

Page Builder widgets — custom widgets so your marketing team can build pages in the editor without a developer and without breaking the design system. This is consistently the highest-leverage thing we build on BigCommerce.

API integrations — Catalog, Orders, Customers, Carts, Checkout, Webhooks, and the GraphQL Storefront API. Most integration work is moving product, pricing or order data correctly between BigCommerce and an ERP, PIM, 3PL or pricing service.

Apps we’ve published

Each one is live, installable, and supported — which means we have been through the review process, the edge cases, and the support load that follows a launch.

What a marketplace app actually involves

Worth knowing before you commission one, because the feature is rarely the expensive part:

  • Multi-tenancy. Every query has to be scoped to the installing store. Getting this wrong is the single most serious class of bug an app can have.
  • OAuth and token handling. Install, uninstall, scope changes, token storage.
  • Webhook verification. Signatures checked against the raw request body, with retry and deduplication, so a downstream outage does not silently drop a day of events.
  • Billing. If it is paid, that is its own integration.
  • Review. BigCommerce reviews submissions, and the first pass usually finds something.
  • Support. Once other merchants depend on it, you own a product, not a project.

If distribution is not the goal, a private app skips almost all of that.

When not to build an app

We talk clients out of this regularly:

  • An existing app does it. Buying is cheaper than building and maintaining, even when the existing app is imperfect.
  • It is really a theme change. A surprising amount of “we need an app” is a Stencil or widget change.
  • Nobody will own it. An app is software, and software needs maintenance. Without a plan for that, you are building a liability.
  • The requirement is still moving. Build it privately first, then productize if it holds up.

Beyond BigCommerce

The same team builds Shopify apps against the Admin and Storefront APIs, and Throttle extensions — including the Klaviyo extension, which connects over OAuth with PKCE and turns commerce events into Klaviyo events through a durable queue with deduplication and exponential retry, plus a ShipStation extension for order and fulfillment sync.

Platform APIs differ; the discipline does not.

Start with the requirement

Tell us what the app needs to do. Often the answer is a private app instead of a public one, a widget instead of an app, or an existing product instead of a build.

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Frequently Asked Questions

What is the difference between a private app and a public app?
A private app — BigCommerce calls these single-click apps when installed from the control panel — runs for your store only. It is faster to build, needs no marketplace review, and is the right answer for anything specific to your business. A public app is listed on the marketplace for any merchant to install. That means OAuth, multi-tenant data isolation, a review process, and an ongoing support obligation. Build one when distribution is the point, not when you just need functionality.
How long does an app take?
A focused private app or a set of Page Builder widgets is usually two to six weeks. A public marketplace app is a few months, and most of the extra time is not the feature — it is multi-tenancy, OAuth, billing, the review process, and building something you can support for other people's stores.
Can you build widgets for the Page Builder?
Yes, and it is some of the highest-leverage work available on the platform. A custom widget moves a layout change from a developer ticket to something your marketing team does in the page editor, without breaking the design system. We publish Epic Page Builder Widgets on the marketplace, so this is the same work we do on our own product.
Do you work with the BigCommerce APIs directly?
Constantly — Catalog, Orders, Customers, Carts, Checkout, Webhooks, and the GraphQL Storefront API. Most integration work is API work: getting product, pricing or order data moving correctly between BigCommerce and an ERP, PIM, 3PL or pricing service.
Can you take over an app someone else built?
Usually. It starts with reading the code and telling you honestly what state it is in. Inherited apps are frequently fine and just unmaintained; occasionally they have a data-isolation or webhook-verification problem that needs fixing before anything else gets added.