Custom Web Development & WordPress Services

Custom web development means building a website or web application around how your business actually works, instead of bending your business around a theme someone sold to thousands of other companies. Off-the-shelf themes and stacks of plugins get a site online quickly, but they usually leave behind slow pages, a confusing admin, conflicts after every update and features that almost fit. Sooner or later every change becomes a workaround.

At CodeWiz we design and code WordPress themes and plugins, custom HTML and CSS templates, online stores and full-stack applications in PHP, JavaScript and MySQL. We write the code ourselves, keep it in Git, document it and hand it over in a state another developer can pick up – no locked-in page builders, no mystery plugins, no “only the original agency can touch this”.

This service is for companies that have outgrown a template site, marketing teams that need an admin they can use without breaking the layout, shops that need integrations a standard plugin does not offer, and founders who need a web application rather than a brochure. If your current site is slow, fragile or hard to change, a custom build is usually cheaper over its lifetime than another round of patches.

Custom: Developer typing on a laptop with code open on a bright wooden desk

Custom WordPress Themes & Templates Built From Scratch

A custom WordPress theme contains exactly the layouts, blocks and settings your site needs and nothing else. Multipurpose themes ship with dozens of demo layouts, sliders and option panels, and every page loads the CSS and JavaScript for all of them. A theme built for one site is lighter, easier to edit and much simpler to maintain.

Block themes, classic themes and page builders

Modern WordPress gives us several ways to build a theme. We pick the approach based on who will edit the site and how much freedom they need:

Approach	Editing experience	Performance	Best for	Trade-off
Block theme (Full Site Editing)	Native block editor for pages, headers, footers and templates	Excellent – CSS is loaded per block	Marketing sites, blogs, corporate sites	Requires discipline in pattern and block design
Classic or hybrid theme	PHP templates plus custom blocks or fields where needed	Excellent when hand-coded	Complex layouts, existing sites, strict brand control	Layout changes usually need a developer
Page builder theme (Elementor, Divi)	Drag and drop everything	Often weak – heavy DOM and assets	Very small sites with frequent layout experiments	Lock-in, bloated markup, harder upgrades
Headless WordPress	WordPress admin, separate JavaScript frontend	Very fast with static or edge rendering	Apps and multi-channel content	Two codebases, plugins that output HTML do not work

How we build themes

Most new projects get a block theme with a carefully designed theme.json: brand colours, fonts and spacing become design tokens, editors only see the options they should use, and the frontend gets consistent, minimal CSS. Reusable sections become block patterns, and anything with real logic becomes a custom block. The WordPress Theme Handbook describes the underlying system.

{
  "$schema": "https://schemas.wp.org/trunk/theme.json",
  "version": 3,
  "settings": {
    "color": {
      "custom": false,
      "palette": [
        { "slug": "brand", "color": "#0b5fff", "name": "Brand" },
        { "slug": "ink", "color": "#111827", "name": "Ink" }
      ]
    },
    "typography": { "customFontSize": false, "fluid": true },
    "layout": { "contentSize": "720px", "wideSize": "1200px" }
  }
}

Disabling custom colours and font sizes looks restrictive, but it is what keeps a site on-brand years after launch. Deliverables include the theme in Git, a pattern library, editor documentation and a staging site.

WordPress Plugin Development & Customization

Plugins are where business logic belongs in WordPress. If a feature should survive a theme change – a booking form, a product configurator, an import from your ERP, a members area – it goes into a plugin. We build custom plugins from scratch and extend existing ones without editing their core files, so updates keep working.

What we typically build

Custom post types, taxonomies and structured fields for catalogues, locations, events, job listings or documentation.
Custom REST API endpoints for mobile apps, partners or a JavaScript frontend.
Imports and synchronisation with CRMs, ERPs, accounting tools and spreadsheets, run as background jobs with Action Scheduler instead of slow page loads.
WP-CLI commands for bulk operations and maintenance tasks that would time out in the browser.
Gutenberg blocks with server-side rendering, so the content stays editable and the HTML stays clean.

Security and quality are not optional

Most WordPress vulnerabilities are found in plugins, and they usually come from the same few mistakes. Every plugin we write checks capabilities and nonces, sanitizes input, escapes output and uses prepared database queries:

add_action( 'admin_post_cw_save_lead', function () {
    if ( ! current_user_can( 'edit_posts' ) ) {
        wp_die( 'Forbidden', 403 );
    }
    check_admin_referer( 'cw_save_lead' );

    global $wpdb;
    $email = sanitize_email( wp_unslash( $_POST['email'] ?? '' ) );
    $wpdb->insert(
        $wpdb->prefix . 'cw_leads',
        [ 'email' => $email, 'created_at' => current_time( 'mysql' ) ],
        [ '%s', '%s' ]
    );
    wp_safe_redirect( admin_url( 'admin.php?page=cw-leads&saved=1' ) );
    exit;
} );

We follow the WordPress coding standards with PHP_CodeSniffer, run static analysis with PHPStan, and cover the critical paths with automated tests. When a third-party plugin almost does what you need, we extend it through its hooks and filters or a small companion plugin – never by patching files that the next update will overwrite.

Developer looking at plugin source code in an IDE on a laptop

WordPress Optimization & Security

A WordPress site slows down and becomes vulnerable gradually: one more plugin, one more tracking script, a growing wp_options table, an admin account nobody remembers. Optimization and hardening reverse that drift and make the site cheaper to run.

Performance work inside WordPress

Profiling with Query Monitor to find slow queries, duplicate queries and plugins that load assets on every page.
Cleaning autoloaded options, transients and post revisions that bloat the database on long-lived sites.
A persistent object cache in Redis, full-page caching, and assets loaded only on the pages that need them.
Responsive images in WebP or AVIF, correct dimensions, lazy loading below the fold and preloading the hero image to improve Largest Contentful Paint.
Replacing heavy plugins with a few lines of focused code when a plugin brings far more than the site uses.

Server-level caching and CDN tuning are a separate layer that we also handle; we have described our approach in how we reach 100/100 page vitals and in our article on Varnish cache for fast websites.

WordPress hardening checklist

Core, themes and plugins updated on a schedule, tested on staging first, with abandoned plugins replaced.
Least-privilege user roles, two-factor authentication for administrators and unique accounts for every person.
DISALLOW_FILE_EDIT, correct file permissions, XML-RPC disabled where it is not used and login rate limiting.
A web application firewall at the edge, security headers and HTTPS everywhere.
Automated off-site backups with restores that are actually tested.

Custom Template Design & Coding

Not every project is a WordPress theme. Landing pages, microsites, HTML email templates, templates for a Laravel or Node.js application and static marketing pages all need clean, hand-written frontend code. We turn designs from Figma (or your existing brand materials) into templates that are responsive, accessible and fast.

Our frontend standards

Semantic HTML with a logical heading structure, landmarks and proper form labels – good for screen readers and for search engines.
Modern CSS: Grid and Flexbox for layout, clamp() for fluid typography, container queries for components that adapt to their space rather than to the viewport.
Either utility-first Tailwind CSS or a small, well-named custom stylesheet, depending on who maintains the code afterwards.
Minimal JavaScript: native browser features first, small modules where interaction is needed, no framework for a page that does not need one.
Testing on real devices and current browsers, with contrast and keyboard navigation checked against WCAG.

Design tokens defined once – colours, spacing, typography – are reused across the WordPress theme, the application templates and the email templates, so every touchpoint looks like the same company.

E-commerce Integration for WordPress and Custom Sites

E-commerce integration is rarely just “install WooCommerce”. The hard part is connecting the store to everything around it: payments, shipping, stock, invoicing and marketing. That is where generic plugins fall short and custom development pays for itself.

WooCommerce done right: High-Performance Order Storage (HPOS) enabled, a lean checkout, custom product types and pricing rules, and no plugin stack fighting over the cart.
Payments: Stripe, PayPal and local card processors, with webhooks handled idempotently so an order is never lost or charged twice – see our guide to secure payment gateway integration.
Back-office sync: two-way synchronisation of products, stock and orders with ERP, warehouse and accounting systems through their APIs or scheduled imports.
Shipping and invoicing: courier APIs for labels and tracking, automatic invoices and fiscal requirements where they apply.
Adding a shop to an existing site: a catalogue and checkout integrated into a custom theme or application instead of a separate, mismatched store.

For broader store strategy we recommend our e-commerce optimization blueprint.

Close-up of hands typing on a laptop keyboard in soft daylight

Full-Stack Web Applications With PHP, JavaScript and MySQL

When a project is mainly about data and workflows rather than content – a customer portal, booking system, internal dashboard, marketplace or SaaS product – a CMS becomes a constraint. We build full-stack web applications where the backend, database and frontend are designed together.

Our usual stack

Backend: Laravel or lean PHP for most business applications, Node.js where real-time features or a JavaScript-only team make more sense.
Database: MySQL or PostgreSQL with a normalised schema, proper indexes and migrations in version control; Redis for caching, queues and sessions.
Frontend: server-rendered templates with Livewire or Alpine.js for most admin-style apps, React or Vue when the interface is complex and highly interactive.
Delivery: automated tests, CI/CD pipelines, containerised environments and monitoring from day one.

A pattern we use often is a hybrid: WordPress runs the marketing site and blog where editors are comfortable, and a separate application handles accounts, orders or bookings, sharing the same design system and single sign-on. Each part uses the tool that fits it best.

WordPress, a Custom Application or a Website Builder?

Choosing the platform is the most expensive decision in a web project, because changing it later means a rebuild. Our honest rule of thumb:

Website builders (Wix, Squarespace) are fine for a very small business that needs a simple presence and no integrations. They become limiting as soon as you need custom logic, ownership of your data or serious performance.
WordPress is the right choice when content is central – marketing pages, blogs, news, documentation, catalogues and stores of small to medium complexity. It has a huge ecosystem and editors already know it.
A custom application is the right choice when the core value is a process: user accounts, complex permissions, calculations, real-time data or integrations that are the product itself.

We work with all of these, so we have no reason to push one over the others.

Common Web Development Mistakes We Fix

Thirty or more plugins on a simple site, several of them doing the same job or no longer maintained.
Edits made directly in a parent theme or plugin files and lost on the next update.
No staging environment, so updates are tested on the live site.
One administrator account shared by everyone, with the password sent around by email.
No version control and no backups that anyone has ever restored.
Third-party scripts – chat widgets, trackers, sliders – loaded on every page and blocking rendering.

What Drives the Cost of Custom Web Development

We estimate each project after a short discovery call instead of quoting from a price list, because the scope varies widely. The main cost drivers are:

The number of unique page templates and custom blocks, and whether a design already exists.
Integrations with external systems: payments, ERP, CRM, shipping and their API quality.
Content migration from an old site, including redirects to protect existing search rankings.
Multilingual requirements, accessibility targets and custom user roles.
Whether the project is a content site, a store or a full application with accounts and business logic.
Ongoing maintenance, updates and support after launch.

How We Work

Discovery: we learn your goals, audience, content and existing systems, and audit your current site if there is one.
Plan: we choose the platform and architecture, define page templates, integrations and editor roles, and agree on scope and timeline.
Design and build: we turn the design into a theme, plugins or application, with weekly previews on a staging site.
Test: we check performance, accessibility, security, browsers, devices, forms, payments and integrations end to end.
Launch: we migrate content, set up redirects, caching, backups and monitoring, and switch over with minimal downtime.
Support: we train your editors, hand over documentation and keep the site updated and secure if you want ongoing care.

Why CodeWiz

Truly full-stack: WordPress, Laravel, Node.js, databases, DevOps and hosting under one roof, so nothing falls between agencies.
Tailored, not template-based: technology chosen to serve your business goals, not the other way round.
Performance and security built in: fast pages and hardened setups are part of the build, not an expensive add-on.
Open-source first: no proprietary builders or licences that lock you to us – you own the code.
Fair pricing: premium development without premium prices, from a team in Banja Luka working remotely with clients locally and internationally.

Frequently Asked Questions

How much does a custom website cost?

It depends on the number of templates, integrations, languages and how much content needs migrating. A focused company site is a much smaller project than a store connected to an ERP or a web application with user accounts. We give you a clear, itemised estimate after the discovery call, before any work begins.

How long does custom web development take?

A custom WordPress theme for a company site typically takes a few weeks from approved design to launch. Stores with integrations and full-stack applications take longer, mostly because of integration work and testing. We agree on milestones up front and show progress on a staging site every week.

Can I edit the website myself after launch?

Yes. We build the admin around your editors: block patterns, sensible fields and restricted options so content can be changed without breaking the design. You also get documentation and a short training session.

Do you redesign or fix existing WordPress sites?

Yes. We often take over existing sites, audit the theme and plugins, fix performance and security issues, and either improve the current setup step by step or rebuild the theme while keeping your content and URLs.

Should I choose WordPress or a custom application?

Choose WordPress when content and marketing are central, and a custom application when the core of your product is a process with accounts, permissions and business logic. Many projects combine both, and we will recommend whichever fits best.

Ready to Build a Website That Fits Your Business?

Tell us what your website or application needs to do, and we will propose the right platform, scope and timeline. Contact us to discuss your project, or explore the full scope of our custom web development services.

Custom Web Development & WordPress Services

Contents