Development
Custom builds made to last.
Inverse Paradox has produced hundreds of custom websites, from simple small business sites to large, complex applications serving high volumes of traffic. We build to the brief, not to the limits of a theme, and we write code your team can maintain long after launch.
From creative front ends to custom integrations, our in-house developers handle the full build: custom themes, custom post types, multisite networks, plugins and the APIs that connect your site to the rest of your business.
Integrations
Your site, connected to everything.
We offer a trusted, supported solution for your unique integration requirements. With a growing list of third-party platforms offering APIs, a custom integration connects your systems so data moves without copy and paste.
- ERPs and accounting platforms, including NetSuite, Sage 100 and QuickBooks
- CRMs such as Salesforce and HubSpot
- Email and SMS marketing platforms like Klaviyo and Mailchimp
- Site search with Algolia and ElasticSearch
- Customer data and analytics with Twilio Segment and Google Tag Manager, including server-side GTM with Stape
- Authentication and single sign-on with Auth0
- Google Merchant Center, Instagram Shopping and Facebook Shops
- Marketplaces including eBay, Amazon and Walmart
- Shipping and fulfillment services
- Learning platforms, single sign-on and enrollment
- Custom APIs built for your workflow
Plugins
Plugins for WordPress and WooCommerce.
Inverse Paradox produces high-quality plugins that expand what WordPress and WooCommerce can do. Whether you need a solution only your site will use or a plugin you plan to offer the WordPress community, we can produce, support and maintain it.
WordPress plugin development
We develop custom plugins for WordPress to deliver on your unique functional and experiential needs.
WooCommerce extensions
We build extensions that add unique functionality to both the WooCommerce admin and the customer-facing store.
Plugin customization
Does a plugin you have not quite meet your needs? We can install, configure and customize it to achieve your goals.
Add-ons and extensions
We extend the functionality of an existing plugin while respecting WordPress development best practices.
White-labeled plugins
Have an idea for a plugin you want to sell? We handle development and support while you keep ownership.
Plugin support & maintenance
Whether it’s a plugin we created or one you rely on, we keep it up to date, secure and error-free.
Public plugins
Tools we’ve shared.
We also publish plugins for the wider community, and offer support and feature requests on every plugin we release. Paid add-ons and extensions are available when you need them to fit your unique needs.
- Clean Duplicate Meta Keys: a developer tool that removes duplicate post meta and improves WordPress site performance.
- Local Delivery by DoorDash: offered by DoorDash from 2023 to 2025, it brought delivery options directly into WooCommerce checkout.
- NITF to WordPress Migration: moves content from Blox CMS (formerly TownNews) and other NITF formats into WordPress.
- Test Payment Gateway for Woo: a WooCommerce payment gateway, including Subscriptions support, built for testing.
Philadelphia-based, nationwide
Senior people, clients nationwide.
Inverse Paradox is a web development agency based just outside Philadelphia, working with clients across the country. Our developers write code that your next developer can read, extend and maintain, with integrations built to last.
Beyond client work we run VIUS, our turnkey websites for small businesses, and Infinite Source, our WordPress and WooCommerce hosting on WP Cloud.
Meet near Philadelphia or over video from anywhere. Let’s talk about your project.
FAQ
Common questions.
Which platforms do you develop for?
WordPress and WooCommerce are our core, along with WordPress VIP, Shopify, Craft CMS, LearnDash and Moodle. Start with our WordPress platform page for details.
Can you integrate our ERP or CRM?
Very likely. We have integrated ERPs, CRMs, accounting platforms, shipping services and marketplaces. If the system has an API, we can usually connect it.
Who owns a plugin you build for us?
With white-labeled plugin development, you keep ownership of your plugin while we handle development and support.
Do you support plugins you didn’t build?
Yes. We can keep a third-party plugin up to date, secure and error-free, or customize it to fit how you work.