Serhii Symonov

Senior WordPress / full-stack engineer who also runs production. I build the plugin, the backend and the front end, then deploy and keep it alive with Docker, Nginx and Cloudflare.

PHPWordPressWooCommerceLaravelVue 3DockerCloudflareAI-assisted development

What I do

WordPress at depth

Custom plugins of any size, Gutenberg blocks, ACF / custom post types, WooCommerce, REST integrations, performance tuning. Three plugins published on wp.org.

Full-stack delivery

PHP and Laravel backends, Vue 3 / TypeScript front ends, Telegram bots and Mini Apps. I own a feature from schema to UI.

Production and DevOps

Docker Compose, Traefik / Nginx, Cloudflare (DNS, WAF, caching), CI/CD, backups, monitoring. I deploy what I build.

AI with guardrails

AI-assisted workflow with human architecture control: clean, maintainable code with tests, not generated sprawl. LLM pipelines (OpenAI, Claude) for translation and tooling.

Selected work

CrowdSpace — crowdfunding aggregator (US + EU)

WordPress · PHP · MySQL · Jenkins · Cloudflare

Lead engineer on a fintech platform listing crowdfunding and investment platforms, with accounts, personal dashboards and affiliate tracking.

  • Rebuilt and extended the platform: custom plugins, modules and Gutenberg blocks.
  • Kept pages fast under real traffic with caching and database/query tuning, including logged-in user areas.
  • Wired GA4, server-side analytics and bot filtering so decisions are made on real traffic.
  • Ran production: Jenkins releases, Nginx, Cloudflare protection.

LenderKit — marketing site for a crowdfunding software vendor

WordPress · content tooling · analytics

Maintained the site and built content tooling and conversion analysis; white papers turned out to convert several times better than ordinary pages, which shaped the content plan.

Archello — architecture platform

Front end · Vue

Front-end development next to a dedicated back-end developer on a commercial product.

Custom AI translation plugin for multilingual WordPress

WordPress · PHP · OpenAI / Claude

A translation workflow plugin built for multilingual production sites, with a Contact Form 7 add-on.

Published on WordPress.org

FakturFlow

Issue KSeF structured e-invoices (FA(3)) from WooCommerce orders. Poland’s mandatory e-invoicing.

SwiftTrap for Mailtrap

Send WordPress email through the Mailtrap API instead of SMTP: bulk and transactional streams, log, suppression list.

Validation Muse for CF7

Custom error and required-field messages for Contact Form 7, SWV-compatible and multilingual.

Also a WordPress.org Translation Editor (Russian) active in 8 locales.

Own products

KeelStats

Live NBA / NFL stats and projections. Shipped solo, Vue + Node on my own VPS.

Oddsloft

Odds comparison site with feeds, structured data and affiliate integrations.

Ukraine alerts API

Go service behind an iOS / Android alert app: snapshot, feed and WebSocket endpoints, rate limited.

Stack at a glance

WordPress / PHP
JavaScript / Vue 3
Docker / Nginx / Traefik
Laravel
Cloudflare / CI/CD
Cloud (AWS)

Self-assessed. Laravel: architecture and full-stack work, not pure back-end specialization.

Working with me