Make WordPress match the way the business actually works
Custom rules, data models, permissions, calculations and workflows without forcing the requirement into a plugin designed for somebody else.
WordPress · PHP · REST API · WooCommerce
Business logic
Integrations
WooCommerce
Admin tools
Handover
Custom WordPress plugin development for functionality that has to hold up.
I’m a senior WordPress plugin developer building custom plugins for business logic, admin workflows, REST API integrations, WooCommerce extensions and internal tools — when off-the-shelf plugins are too generic, too heavy or simply cannot model the workflow correctly.
Connect WordPress to the systems around it
REST APIs, webhooks, CRMs, ERPs, PIMs, payment providers and internal services with retries, logging and failure handling.
Extend checkout, products and orders safely
Purpose-built extensions for product rules, payments, shipping, subscriptions, catalogue data and order operations.
Give editors and operations teams the right controls
Settings screens, bulk tools, queues, dashboards and approval flows designed for the people who use them every day.
Code another developer can own later
Versioned, documented and isolated from theme code so updates do not turn the feature into a maintenance trap.
Custom WordPress plugin development
Build the feature around the requirement — not around a plugin catalogue.
A custom plugin is useful when the requirement is specific enough that configuring five unrelated plugins creates more risk than writing one focused piece of software. The goal is the smallest maintainable plugin that owns the business logic clearly.
Custom workflows and rules
Approval flows, calculations, permissions, custom states, scheduled jobs and other domain logic that needs to behave consistently across the site.
REST API and third-party integrations
Push or pull data between WordPress and external systems with authentication, validation, queues, retries, logs and sensible failure states. See WordPress API integration services →
Custom WooCommerce plugin development
Checkout logic, product configuration, pricing rules, order automation, payment/shipping extensions and ERP or PIM synchronisation.
Internal tools and dashboards
Purpose-built admin screens, bulk actions, imports, reporting and controls that reduce repetitive work for editors and operations teams.
Extend without hacking vendor files
Use hooks and public APIs where possible, or build an extension plugin that survives updates instead of editing third-party code directly.
Custom plugins as the product surface for automation
WordPress interfaces for AI workflows, n8n automations, classification, retrieval or internal tools when the workflow needs permissions and controls inside the CMS.
When custom code is the cleaner option
Not every requirement needs a new plugin. The first job is deciding whether one should exist at all.
I start by checking whether WordPress core, an existing plugin or a small integration can solve the requirement cleanly. Custom development earns its cost when the workflow is business-specific, the data model is unusual, reliability matters or the plugin stack is becoming harder to maintain than the feature itself.
That scoping step also keeps the build smaller. A focused plugin with one clear responsibility is easier to test, secure, extend and hand over than a miniature platform hidden inside WordPress.
- Business rules that cannot be represented cleanly with configuration alone.
- API integrations that need authentication, data mapping, retries or audit logs.
- WooCommerce features tied to pricing, checkout, stock, orders or catalogue data.
- Admin workflows that currently live in spreadsheets or repetitive manual steps.
- Several overlapping plugins creating performance, security or maintenance debt.
- Existing custom code that needs refactoring into an update-safe plugin.
Engineering standards
A custom plugin should reduce future complexity, not create it.
The implementation stays inside WordPress conventions where they help: capabilities and nonces, sanitisation and escaping, hooks, scheduled jobs, REST endpoints, database APIs and upgrade-safe extension points.
Permissions, validation and safe output
Capability checks, nonce protection, sanitised input, escaped output and least-privilege API access are part of the build rather than a later hardening pass.
Queries and background work designed for production
Avoid expensive global hooks, unnecessary requests and blocking jobs. Heavy work moves to queues or scheduled processing where appropriate.
Clear ownership and documented extension points
The code is organised around responsibilities, stored in version control and documented so a future developer can understand where to change it.
No edits to WordPress core or vendor plugin files
Custom behaviour lives in its own plugin or documented extension layer so WordPress, WooCommerce and third-party updates remain manageable.
Logs where failure matters
Integrations and scheduled workflows can record failures and useful context instead of silently losing data.
Your code remains yours
Source code and documentation are delivered to the client or agency. The plugin should not create dependency on one developer to keep operating.
Typical deliverables
From technical scope to production plugin.
The exact shape depends on the requirement, but the engagement is designed to leave you with working software and enough context to maintain it.
Technical scopeRequirements, data flow, dependencies, risks and what belongs inside the plugin.
Plugin implementationPHP, WordPress APIs, REST endpoints, admin UI and frontend behaviour as required.
Integration handlingAuthentication, mapping, webhooks, queues, retries and logs for external systems.
Staging QAFunctional testing, edge cases, permissions, updates and performance before production.
DeploymentControlled release with configuration and migration steps documented.
HandoverSource code, notes and extension points so the plugin can be maintained independently.
How the work runs
Scope the behaviour first, then write the plugin.
Discovery
Map the workflow and failure cases
What triggers the feature, who can use it, what data moves, what happens when an API is down, and what the site must never do.
- Existing plugin and theme audit
- Data model and integration map
- Security and permission boundaries
- Smallest useful implementation
Build + ship
Implement in staging, test, then deploy
Development stays versioned and reviewable. The plugin is tested against real content and the current WordPress stack before production.
- Git-based development
- Staging before production
- Update and regression checks
- Documentation and handover
Selected plugin work
Production WordPress plugins built around real workflows.
A few anonymised examples from client-owned production systems. The point is not the plugin count — it is owning the business logic cleanly enough that the feature remains understandable, testable and maintainable after launch.
Internal search delivered as a WordPress mu-plugin
Built a production search layer for a multi-portal publishing environment, keeping search logic inside a focused plugin rather than coupling it to the theme.
Engagement tracking beyond pageviews
Built custom tracking for 25%, 50%, 75% and 100% scroll depth plus engaged time, feeding cleaner behavioural signals into analytics without adding a generic tracking suite.
Contextual CTA automation with editor control
Implemented automatic CTA placement around content depth with a shortcode override, so editors get consistent placement without losing manual control when a page needs it.
AI-assisted image metadata with human approval
Built the WordPress-side workflow for queued image processing, re-queue actions, manual SVG handling and human review before generated alt text is accepted.
API-backed workflows with failure handling
Connected WordPress to external services through REST APIs and webhooks with explicit mapping, retries and operational safeguards instead of silent best-effort requests.
Pre-deploy manifest + Kinsta smoke testing
Built a custom WordPress plugin for a retail SaaS team that collects the week's release changes before Thursday deployment, then connects over SSH after the Kinsta release to run site-wide smoke testing. Read the deployment automation case study →
FAQ
Custom WordPress plugin development questions.
A custom plugin makes sense when the site needs business logic, integrations or workflows that off-the-shelf plugins cannot provide cleanly, or when stacking several generic plugins creates performance, security or maintenance risk.
Yes. I audit the plugin first and use documented hooks or APIs where possible. If the change needs to remain separate, I build an extension plugin so vendor updates do not overwrite the work.
Yes. Typical work includes checkout and cart logic, payment or shipping integrations, product rules, ERP/PIM sync, subscriptions, admin workflows and automation around orders or catalogue data.
Yes. The code is delivered to you, documented and versioned so your team or another developer can maintain it later.
Yes. I can audit inherited custom plugins, identify security or performance risks, stabilise the code and refactor it incrementally when a full rewrite is unnecessary.
A focused plugin can often be scoped and shipped in days to a couple of weeks. Multi-system integrations, complex WooCommerce extensions or migration-heavy work take longer. I estimate after mapping the workflow, dependencies, data and failure cases.
I quote against an agreed scope rather than a generic plugin price. Cost depends on workflow complexity, external APIs, admin UI, data migration, testing and reliability requirements. The first step is reducing the requirement to the smallest maintainable implementation.
Need WordPress to do something the plugin directory does not?
Send the workflow, the current site and the systems it needs to connect to. I will tell you whether this should be custom code — and the smallest sensible way to build it.
Related WordPress services
Custom plugins usually touch more than PHP.
These service pages cover the surrounding performance, SEO, WooCommerce and automation work when the feature is part of a larger production system.
Build guideWhen a custom WordPress plugin is the right choiceArchitecture, security, APIs, ownership, maintenance and project scoping.DevelopmentFreelance WordPress developerCustom builds, integrations and senior WordPress engineering.SearchTechnical SEO for WordPressCrawl, indexation, architecture, schema and implementation.AutomationWordPress AI automationn8n, APIs, RAG, AI workflows and custom product logic.CommerceWooCommerce developmentCheckout, product logic, ERP/PIM and store integrations.PerformanceWordPress performanceCore Web Vitals, database, rendering and third-party scripts.SupportWordPress maintenanceOngoing production ownership after the plugin ships.
