WordPress & CMS Engineering

WordPress built for
editors who move fast
and code that holds up.

WordPress powers 43% of the web - but the gap between a theme-shop install and a production-grade WordPress platform is enormous. We close that gap: custom themes engineered from scratch, plugins built to extend (not override) core, headless architectures that give editorial teams the CMS they know while giving frontend teams the stack they need, and WooCommerce builds that actually survive peak trading.

Built for: Publishers & Media eCommerce Brands Membership Platforms Marketing Agencies SaaS Marketing Sites Headless Frontends
55+
WordPress & CMS projects delivered
100/100
Lighthouse score on all shipped builds
0
Security incidents across all live sites
<1.2s
LCP on mobile across all live builds
9yr
Combined WordPress core team experience

Six WordPress disciplines - each with its own set of real engineering problems

A headless WordPress build and a WooCommerce scale project look similar on a brief and are completely different engineering problems in practice. A custom Gutenberg block library and a WordPress plugin sold commercially have almost nothing in common technically. We have delivered all of these - which means we know where the difficulty actually lives before we begin.

Custom WordPress Theme Development

WordPress themes built from a blank file - not a premium theme with the branding changed. The difference matters most for performance and maintainability: a bespoke theme loads what it needs, can be extended by your team without fighting the original developer's assumptions, and has no licensing dependencies that expire.

Block-based theme development (FSE-compatible)
Theme.json design token system for editorial consistency
Custom Gutenberg block registration via block.json
ACF Pro field group architecture for content editors
WCAG 2.1 AA accessibility built in from the first commit
Avg. 94 Lighthouse score - On all custom theme launches

Headless WordPress & Decoupled CMS

WordPress as a content backend with a modern frontend framework consuming data via WPGraphQL or the REST API. Editorial teams keep the WordPress interface they know. Developers get React, Next.js, or Nuxt with full control over rendering - including ISR, SSR, and static generation per content type.

WPGraphQL schema design and fragment architecture
Next.js / Nuxt.js frontend with ISR and SSG
JWT and Application Password authentication
Preview mode for draft content in the frontend
Revalidation webhooks on publish / update events
Sub-1.2s LCP - On headless builds in mobile real-world tests

Custom WordPress Plugin Development

Plugins written to extend core correctly - using hooks, filters, and the Settings API - rather than overriding it. Whether the deliverable is an internal operational tool, a white-label product, or a plugin distributed on the repository, the architecture is the same: isolated, testable, and forward-compatible with WordPress core updates.

WP_List_Table implementations for admin data views
Custom REST API endpoints registered via register_rest_route
Settings pages built with the WordPress Settings API
Transient-backed caching for external API data
PHPUnit test suite using WP_Mock and Brain Monkey
100% hook-based - Zero direct wp-includes modifications

WooCommerce Development & Scale

WooCommerce for stores that need to handle real trading volume - not the default configuration that degrades at a few hundred concurrent users. We build bespoke product types, custom checkout flows, subscription logic, B2B pricing structures, and the server-side optimisations that keep response times acceptable during traffic peaks.

Custom product types registered via WC_Product extension
Stripe and Klarna payment gateway integration
WooCommerce Subscriptions with custom renewal logic
Object cache and transient strategy for product queries
High-load staging environment stress tests with k6
£12M+ GMV - Processed across WooCommerce builds we run

Gutenberg Block Library Development

Bespoke block collections that give editorial teams a controlled, on-brand set of layout options - without exposing the full Gutenberg toolbar to users who will misuse it. Blocks are registered server-side via block.json, styled with isolated CSS, and constrained to prevent editors producing layouts that break the design system.

Dynamic blocks with server-side rendering via render_callback
InnerBlocks with allowedBlocks constraints for editors
Block variations and block styles for design flexibility
Block.json-driven metadata and attribute declaration
Full block.json attributes API (context, usesContext)
Zero theme conflicts - Across all block library deployments

WordPress Security Hardening & Migrations

Legacy WordPress sites with outdated plugins, weak file permissions, and no monitoring are the rule, not the exception. We conduct structured audits, remove plugin bloat, harden configuration at the server and application layer, and migrate multisite networks and high-traffic single sites with zero content loss and managed downtime.

Full plugin and theme vulnerability audit
File permission hardening and wp-config.php relocation
Fail2ban, two-factor auth, and login URL obfuscation
Multisite to multisite migrations with media library intact
Staging environment parity and rollback plan before every migration
Avg. 68% plugin reduction - On legacy site security audits

Why WordPress quality is a business problem, not a developer preference

Most WordPress problems look like content or design problems until you trace them back to the engineering decision that caused them - a plugin installed for one feature that now owns half the frontend, a theme that hardcodes styles into the database, a WooCommerce installation where nobody knows which plugin is conflicting with checkout. These are the patterns we build against from the first sprint.

01

Plugin sprawl is a performance and security problem disguised as a feature list

The average WordPress site audited by our team arrives with 34 active plugins. Eight of those are doing things that should be in the theme or a single custom plugin. Twelve have not been updated in over a year. Four have known CVEs. Every additional plugin is a surface area: for security vulnerabilities, for update conflicts, and for page weight. We reduce plugin count by an average of 68% on every audit engagement - replacing plugin functionality with lean, purpose-built code that has no external update dependency.

68%
Avg. plugin reduction on legacy site audits
02

Core Web Vitals are a ranking factor - and most WordPress themes fail them by default

Google uses Core Web Vitals as a direct ranking signal. A WordPress site loading 18 render-blocking scripts, 4MB of unoptimised images, and a Google Fonts call that delays the LCP element is losing organic visibility every day it remains in that state. We engineer for CWV from the first line of theme code: critical CSS inlined, fonts self-hosted, images lazy-loaded with correct aspect ratios, and third-party scripts deferred until after the first contentful paint.

100/100
Lighthouse performance score on all custom themes
03

Gutenberg without constraints gives editors the power to break the design system

The WordPress block editor is genuinely powerful for content editors. It is also the fastest way to produce a page that looks nothing like the brand guidelines, if you leave the full toolbar available. We build block libraries with InnerBlocks constraints, allowedBlocks restrictions, and block styles that make it structurally impossible for an editor to combine layout elements the design system does not permit - without hiding functionality editors actually need.

0
Design system violations on constrained block library builds
04

WooCommerce's default configuration is designed for demonstration, not for production load

A WooCommerce installation with no object caching, no query optimisation, and the default session handling will degrade visibly at a few hundred concurrent users. We instrument every WooCommerce build with Query Monitor in development, configure a persistent object cache (Redis or Memcached) before launch, replace WC session handling for authenticated users, and load test with k6 before any high-traffic event. The result is a checkout that holds under the load you actually send to it.

<200ms
Add-to-cart response time under 500 concurrent users

Content architecture first - with a working editorial environment at every checkpoint.

We do not start building templates until the content model, block library scope, and URL structure are agreed in writing. The decisions made in week one determine whether the CMS is intuitive to editors in year three - or a source of daily friction from the first month.

Wk
Wk 1

Content Architecture & Discovery

Post type taxonomy, custom field group design with ACF Pro, URL structure, navigation hierarchy, and block library scope agreed before any theme file is created. Headless projects include WPGraphQL schema design in this phase.

Wk
Wks 2–3

Theme Foundation & Block System

Child-free custom theme scaffold, theme.json design tokens, block.json registered block library, and the base template hierarchy. CI pipeline with PHPCS WordPress coding standards, PHPUnit, and Cypress from day one.

Wk
Wks 4–7

Template Build & Content Migration

Page template development, custom block builds, WooCommerce or membership integration if scoped, and content migration from the existing CMS. Staging environment with real content throughout - no Lorem Ipsum demos.

Wk
Wk 8

Performance & Security Sprint

Lighthouse audit, Core Web Vitals pass, Query Monitor profiling, Redis object cache validation, image pipeline review, plugin audit and pruning, and a full security configuration check before launch sign-off.

Wk
Wks 9+

Launch & Editorial Handover

Zero-downtime DNS migration, WordPress Multisite or single-site launch checklist, editorial team walkthrough of the CMS, written content guide for the block library, and 30-day hypercare support period.

The WordPress stack we use on every engagement.

Every tool listed below is in active production use on sites we maintain today. Nothing chosen because it had a good conference talk.

CMS Core
WordPress 6.xGutenberg (block editor)WordPress MultisiteCustom Post Types APIREST API v2WP-CLI
Content & Fields
ACF ProACF BlocksWPGraphQLYoast SEOGravity FormsCMB2
Theme Architecture
Block Theme (FSE)theme.json tokensblock.jsonTimber (Twig)Underscores baseSCSS / PostCSS
eCommerce
WooCommerce 8.xWooCommerce SubscriptionsWooCommerce MembershipsStripe for WooCommerceKlarna PaymentsWC Blocks
Headless / API
WPGraphQLNext.js 14Nuxt 3Faust.jsAtlas (WPEngine)ISR / SSG / SSR
Performance & Cache
Redis Object CacheW3 Total CacheWP RocketCloudflareBunnyCDNQuery Monitor
Security
WordfenceTwo-Factor (plugin)Limit Login Attemptswp-config.php hardeningHTTPS enforceVulnerability Scanner (Patchstack)
Testing & Deploy
PHPUnit (WP)WP-MockCypressPHPCS (WordPress std.)GitHub ActionsWP Engine / Kinsta / RunCloud

What clients ask before we start

Straight answers on headless vs traditional WordPress, plugin choices, editor experience, WooCommerce scale, and how we approach sites that already exist. Ask directly if your question is not here.

Traditional WordPress is right for most projects. It is faster to build, has a simpler hosting footprint, and gives editorial teams a complete interface without the complexity of managing a separate frontend deployment. Headless WordPress makes sense when the frontend team needs a specific framework (Next.js, Nuxt, SvelteKit) for reasons beyond WordPress - most commonly performance requirements that cannot be met with server-side rendered WordPress, a need to share components across multiple platforms, or an existing design system built in React that the site must conform to rather than the other way around. The hosting and deployment overhead of a decoupled architecture is real: two codebases, two deployment pipelines, preview mode configuration, and ISR cache invalidation to manage. We will tell you whether that overhead is worth it for your specific project before you commit.
Multisite is the right architecture when you need to manage multiple sites from a single WordPress installation, share users across sites, or give sub-sites access to a shared plugin and theme library. We have built Multisite networks for publishers with 40+ sub-sites and for SaaS platforms offering client microsites as a product feature. The key decisions - subdomain vs subdirectory, shared vs per-site themes, network-activated vs site-level plugin management, and database table prefix strategy - need to be made before the first site is created, because changing them later is expensive. We scope these decisions in discovery before any code is written.
A custom WordPress theme with a bespoke Gutenberg block library, content migration from an existing CMS, and a standard plugin set runs between £12,000 and £35,000 depending on page template count, block complexity, and whether WooCommerce is in scope. Headless WordPress with a Next.js frontend adds £8,000 to £22,000 to that baseline, depending on content type complexity and caching strategy. A standalone commercial WordPress plugin with a settings UI, REST API endpoints, and a PHPUnit test suite typically runs between £6,000 and £18,000. Every project gets a fixed-price quote with a detailed scope document before you commit.
Yes, and we do this regularly. Our starting point is always a paid technical audit: we review the theme architecture, active plugin list (with update status and known CVE check), database query performance via Query Monitor, Core Web Vitals, security configuration, and hosting environment. We give you a written report with a prioritised remediation list. Around half the audits we run result in targeted improvements; the other half identify structural issues that require a rebuild of the theme or a migration to a cleaner setup. We will tell you which category applies before you proceed.
Every site we maintain runs on a staging environment that mirrors production exactly - same PHP version, same database, same plugin versions. Major WordPress core updates and WooCommerce major releases are applied to staging first, run through an automated Cypress test suite covering critical user paths (checkout, form submission, member login), and reviewed manually for visual regressions before being applied to production. We maintain an update log for every client site and send advance notice before major updates. Our clients have not experienced a production outage caused by a WordPress or plugin update since we introduced this process.
Security for WordPress comes in layers. At the server level: PHP running as the site user (not www-data), file permissions that prevent WordPress from writing to its own PHP files, wp-config.php moved above the webroot, and fail2ban configured to block repeated failed login attempts. At the application level: the wp-admin login URL changed, two-factor authentication enforced for all admin accounts, user registration disabled if not needed, and XML-RPC disabled unless a specific integration requires it. At the monitoring level: Patchstack or Wordfence scanning for plugin vulnerabilities, a weekly automated file integrity check, and uptime monitoring with alerting. We audit every new client site against this list and close gaps before they become incidents.
Let's Build

Tell us what you need to build. We'll tell you how we'd build it.

Book a free 45-minute technical consultation with our WordPress lead. Whether you are starting from a blank brief, inheriting a site you are not confident in, or evaluating whether to go headless - we will give you an honest technical view and a clear scope before you commit to anything.

Book a Free Call
Fixed-price quotes on all projects
Full source code and asset ownership
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