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WordPress Plugin Development

Services

Extend WordPress functionality with custom plugins built for your needs.

What We Offer

At Filter, we design and develop custom WordPress plugins that solve specific business challenges. Whether you’re integrating with third-party systems, streamlining workflows, or introducing new functionality, we create robust, maintainable plugins that enhance your platform without unnecessary complexity.

Custom Plugin Development

At Filter, we’ve built custom plugins for a wide range of clients – alongside developing our own leading product, PersonalizeWP. We use that experience to create plugins that solve real problems, integrate seamlessly into your platform, and support long-term business goals.

Bespoke System Integrations

When off-the-shelf integrations don’t cut it or don’t exist, we can build custom plugins to connect WordPress with your CRM, ERP, marketing automation or internal systems. We work with REST, GraphQL and legacy APIs to ensure secure and reliable data flow.

Admin Interfaces and Workflows

We design intuitive admin experiences for plugin functionality. Whether you’re managing content, users or data, we build custom interfaces and admin tools that make complex tasks easier for non-technical users. We’re used to building in WordPress and follow a close-to-core methodology in what we offer.

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Need a plugin that actually solves a problem?

Get in touch to discuss how Filter can help you build or improve a WordPress plugin.

We’ve built plugins for clients across sectors and developed our own, PersonalizeWP – giving us the insight to deliver practical, long-term solutions.
We connect WordPress to CRMs, ERPs, marketing tools, and internal systems with custom-built integrations using REST, GraphQL or legacy APIs.
We design user-friendly admin tools that make it easier for your team to manage data, content or settings – built to feel native to WordPress.
Our plugins are lean, secure and stable, built following WordPress standards and tested thoroughly before release.
From AI and personalisation to advanced WooCommerce features, we develop plugins that solve real business challenges without limitations.
We improve, extend and support existing plugins – enhancing functionality, fixing issues and keeping performance on track.

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Performance and Security

We follow WordPress best practices to ensure every plugin we build is secure, fast, and stable. Our code is lean, well-documented and extensible, built with long-term performance in mind and with our experience, you’ll know that we will have stress-tested in before it goes anywhere near production.

Custom Functionality for Complex Requirements

We’ve developed plugins that power personalisation, AI-driven features and advanced WooCommerce functionality, but we’re not limited by category or convention. Filter builds the tools your business needs working closely with your team to understand the problem, define the requirements, and deliver a solution that fits seamlessly into your platform.

Extension and Support for Existing Plugins

We audit and extend existing plugins, whether developed in-house or by third parties. We can add features, fix compatibility issues or clean up code that’s slowing your site down. Our focus is on improving stability, maintainability, and long-term performance without disrupting your current workflows.

Frequently Asked Questions

We build custom plugins for everything from site-specific features and integrations to workflow tools and content automation.
Yes, we develop plugins that connect WordPress with your CRM, ERP, marketing or business platforms via APIs or custom logic
Absolutely. We offer ongoing support, improvements and updates for every plugin we develop.
We write lean, efficient code, test for performance impact and monitor for regressions as part of our QA process.
Yes, we can audit, extend or refactor existing plugins, whether they were developed by us or another team.
Yes. We follow the WordPress coding standards and ensure compatibility with the latest versions of core and major plugins.
Yes. We’ve helped clients turn internal tools into commercial plugins, including licensing models, update systems and UI polish.
We follow secure coding standards, validate inputs, and perform regular code reviews to minimise vulnerabilities.
Yes. We ensure compatibility with multisite networks and multilingual configurations where needed.
Absolutely. We develop plugins with user-facing components such as forms, dashboards, content filters and product interfaces.

Interested in working with us?

Get in touch