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SERVICES / WORDPRESS PLUGIN DEVELOPMENT

Custom WordPress plugins, built to last

When no plugin does exactly what your business needs, we build one: integrations, Gutenberg blocks, WooCommerce extensions, and internal tools - clean, documented, and yours.

See what you get

Get a fixed quote

We reply within one business day with questions or a ballpark. NDA available on request.

01 THE PROBLEM

Sound familiar?

  • Five plugins for one feature

    Stacking plugins and snippets to get one job done means slower pages, conflicts, and more things to update.

  • Off-the-shelf almost fits

    Generic plugins make your process fit them. A custom plugin fits your process.

  • Code nobody maintains

    Abandoned plugins and copy-pasted snippets are a common source of bugs and security problems.

02 BUILT LIKE SOFTWARE

A real plugin, not a snippet

We build standalone plugins that use WordPress hooks and APIs instead of editing core, themes, or other plugins. That means your feature survives theme changes and updates.

Code follows WordPress Coding Standards, is versioned in Git, reviewed before release, and documented for whoever works on it next. You own all of it.

  • Snippet in functions.php: breaks when the theme changes, no updates, no docs
  • add.black plugin: standalone, versioned, documented, and easy to update

03 HOW IT WORKS

Four steps, fixed price

  1. Scope

    We map what the plugin must do, edge cases, and integrations. Fixed scope and price.

    Day 1-2

  2. Working prototype

    A first version on a staging site so you can test the real workflow early.

    Days

  3. Build and test

    Code review, security checks, testing on current WordPress and PHP versions.

    Fixed scope

  4. Handover

    Deployment, documentation, and optional maintenance so it keeps working.

    Ongoing

04 SCOPE

What we build

  • Custom post types and fields

    Structured content for listings, catalogs, events, or records.

  • Gutenberg blocks

    Custom blocks your editors can use anywhere on the site.

  • WooCommerce extensions

    Custom checkout steps, pricing rules, product types, and reports.

  • API integrations

    CRMs, payment providers, ERPs, email tools, and custom APIs.

  • Admin dashboards

    Settings pages and tools that make daily work faster for your team.

  • User roles and memberships

    Custom permissions, portals, and member-only content.

  • Imports and automation

    Scheduled syncs, bulk imports, and background jobs.

  • AI features

    Content generation, smart search, or assistants built on AI APIs.

05 WHAT YOU GET

Every plugin ships with

  • Source code in a Git repository you own
  • WordPress Coding Standards, prefixed and namespaced code
  • Security basics: nonces, capability checks, sanitized input, escaped output
  • A clear settings screen for your team
  • Translation-ready strings
  • Documentation for admins and developers
  • Testing on current WordPress and PHP versions
  • 30 days of bug fixes after launch

Recent plugin work

  • Charity auction platform

    Custom auction plugin for payand.help: lots, bidding, and payments. [VERIFY wording]

  • AI content assistant

    Plugin for urok.live that drafts Ukrainian-language posts with AI, reviewed by editors. [VERIFY wording]

06 PRICING

Pricing

Every plugin gets a fixed price after scoping - no hourly billing.

07 THE TEAM

Who does the work

add.black is a small senior studio. You work directly with the people who design and build your site - no account managers in between.

  • Alex Denysiuk

    Founder & lead engineer

    10+ years in WordPress, WooCommerce and Laravel. Plans, writes and reviews the code on every project.

    LinkedIn: Alex Denysiuk

  • Maryna Nesterchuk

    Designer & illustrator

    7+ years of design and illustration. Interfaces, brand visuals and custom artwork that make sites feel human.

    LinkedIn: Maryna Nesterchuk

08 FAQ

Questions

Who owns the code?

You do. The plugin lives in your Git repository and you can use, change, or hand it to another developer at any time.

Will it keep working after WordPress updates?

We build on stable WordPress APIs and test on current versions. A maintenance plan covers compatibility updates over time.

Can you extend or fix an existing plugin?

Yes. Where possible we extend it through hooks in a separate plugin, so updates to the original do not overwrite your changes.

Do you build WooCommerce extensions?

Yes - custom checkout fields, pricing rules, product types, integrations, and reports.

Can you publish the plugin on WordPress.org?

Yes, if you want it public. We prepare it for the plugin directory review.

Do you sign an NDA?

Yes, we are happy to sign one before you share details.

09 GET IN TOUCH

Describe the plugin. We'll send a fixed price.

We reply within one business day with questions or a ballpark. NDA available on request.

Prefer email? lets@add.black

Send us a message