A WordPress developer is a programmer specialising in the world's most popular CMS: writing custom plugins, modifying themes, building integrations, and owning performance and security. The job market shows the scale: full-time WordPress developer roles in Poland pay 10,000–14,000 PLN per month (and 16,000–27,000 PLN for full-stack roles), freelance rates hover around 60–150 PLN net per hour, and agencies charge 100–200 PLN/h. This guide helps you choose a vendor who will actually solve the problem — not just "install a plugin".
Najważniejsze: A WordPress developer specialises in: custom plugins, theme modifications and child themes, API integrations (CRM, ERP, payments), migrations, performance (Core Web Vitals) and security. 2026 rates: full-time 10,000–27,000 PLN/month, freelancers 60–150 PLN net/h, agencies 100–200 PLN/h. Vendor checklist: a portfolio of real sites, code in a repository, copyright transfer, post-launch support and a clear process (stages, demos, tests).
What does a WordPress developer do?
The scope is wider than the name suggests
- Custom plugins — features ready-made extensions do not cover: calculators, configurators, unusual processes, internal integrations.
- Themes and child themes — appearance and structure changes without destroying the original; building themes from scratch (block or classic).
- API integrations — CRM, ERP, booking systems, payments, mailing; webhooks, queues, synchronisations.
- Performance — load time, Core Web Vitals, cache, images, hosting.
- Security — hardening, audits, incident response (WordPress malware removal).
- Migrations and updates — hosting moves, updates without downtime, migrations from other platforms.
A good developer knows PHP, MySQL, JavaScript and the WordPress ecosystem (hooks, custom post types, REST API, ACF, WooCommerce) — and understands business, not just code.
Full-time, freelancer or agency?
| Model | Pros | Cons | Cost |
|---|---|---|---|
| Full-time | Continuity, commitment, product knowledge | Fixed cost, one person's skill range | 10,000–27,000 PLN/month |
| Freelancer | Flexibility, lower rate, direct contact | Availability, narrow specialisation risk | 60–150 PLN/h |
| Agency | Team, process, support and care | Higher rate, project queues | 100–200 PLN/h |
For single modifications and plugins — a good freelancer. For a project with integrations and years of development — a team or agency with process and documentation. For a site with a sales goal, where SEO, performance and security matter — a vendor who treats those as standard.
How to vet a WordPress developer — concrete questions
- Portfolio — real, working sites. Open them, check speed (PageSpeed), mobile and forms.
- How do you work? — stages, demos after each phase, staging, milestone payments. "We build everything and show it at the end" is a red flag.
- Code and repository — code in Git, handed over to the client; copyright in the contract.
- Custom plugins or plugin-of-a-plugin? — a good developer does not multiply dependencies needlessly, but is not afraid to write a custom solution when it is cheaper to maintain.
- What about performance and SEO? — is optimisation and structured data part of the implementation or an "extra"?
- Post-launch support — what happens after an update breaks the site? Look for an SLA (WordPress website care).
How much does a WordPress developer cost?
| Scope of work | Cost (net) |
|---|---|
| Minor fix, plugin configuration | 200–800 PLN |
| Theme modification / child theme | 800–2,500 PLN |
| Custom plugin (simple scope) | 1,500–5,000 PLN |
| API integration (CRM, ERP, payments) | 3,000–12,000 PLN |
| Performance optimisation | 1,500–5,000 PLN |
A quote without a specification is guesswork — a good vendor starts with a short analysis and quotes in stages. If you are unsure how to describe requirements, see how to prepare requirements and a quote.
Frequently asked questions
How much does a WordPress developer earn in 2026?
- Full-time roles: 10,000–14,000 PLN per month (mid), 16,000–27,000 PLN for full-stack with React and integrations. Freelancers: 60–150 PLN net/h. Agencies: 100–200 PLN/h. Rates rise with experience in integrations, performance and security.
Do I need a WordPress developer or just a site administrator?
An administrator (content, updates, small configuration) covers daily needs. A developer steps in when something must be written, an integration built, the site sped up or secured. The roles complement each other — many companies have both.
Does the developer need to know PHP?
Yes — WordPress is PHP. Plugins, themes and integrations require PHP 8.x, hooks, REST API and MySQL. An "Elementor-clicking specialist" will not write a plugin.
Where do I find a WordPress developer?
Agency and freelancer portfolios, industry groups, referrals, freelance platforms. Verification is key: real sites, code in a repository, references. Also compare the scope with a WordPress programmer — the roles overlap.
What about code and plugin rights?
The contract should transfer copyright to plugins and modifications, and the code should land in the client's repository. A plugin held only "at the vendor" is dependency — changing vendors means rewriting the work.
What does remote collaboration look like?
The same as local, if the processes are there: staging, stage demos, status updates, milestone payments, post-launch support. The office address matters less than communication and the contract.
Sources and tools
- WordPress Developer Resources
- WordPress — handbooks (plugins, themes, blocks)
- No Fluff Jobs — WordPress offers with salaries
- Pracuj.pl — WordPress developer offers
- OWASP — web application security
👉 Looking for a WordPress developer for a site or store? See hire a WordPress developer and website development in my offer: custom plugins, API integrations, performance and security. Get in touch via the contact form or at kontakt@informatix.com.pl.
👉 Choosing a vendor? Check WordPress programmer, WordPress website development and WordPress website care.
📖 See also: WordPress administration, WordPress ecommerce and e-commerce store development.