Oleksii Siniaiev · Senior Full-Stack Engineer

I build web products that stay maintainable.

Full-stack engineer shipping billing systems, SaaS tools, and content platforms with product teams. 10+ years in production.

Clean architecture, honest code, things that ship.

Current focus — Laravel architecture, React & Vue.js frontends, AWS infrastructure, and scalable product delivery.

Read my articles See my work Download CV

Latest

From the blog

Technical articles based on real problems from work. Laravel, WordPress, architecture, performance, and modern PHP.

Article Mar 24, 2026 3 min read

Debugging a Production Site After AI Deployment — What the Browser Sees vs. What You Shipped

After deploying a portfolio site built with AI, I found broken mobile menus, bullet-point badges, and content overflow — all caused by server-level CSS…

WordPress Mar 21, 2026 18 min read

How I Built and Deployed a Custom WordPress Theme with AI Agents in Under 6 Hours

A complete walkthrough of building a zero-JavaScript, multilingual WordPress theme on Bedrock architecture, deployed to Hostinger — with Claude Code AI doing the heavy…

Article Jul 21, 2023 2 min read

Understanding Dependency Injection and Dependency Inversion in Laravel

A practical explanation of Dependency Injection and the Dependency Inversion Principle in Laravel, with examples of when abstractions improve maintainability and testing.

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Portfolio

Selected work

Real projects I've shipped — from content platforms to SaaS products.

SAAS PLATFORM

WProofreader SaaS — Subscription Management Platform

Full SaaS platform for WebSpellChecker — subscription billing with Stripe, OAuth authentication, team management, API credential provisioning, and usage analytics.…

AWS
Docker
Inertia.js
Laravel
MySQL
PHP
REST API
Stripe
Tailwind CSS
Vue.js

Visit live site →

MEDIA PLATFORM

Artnet News — Global Art Media Platform

Ongoing freelance engineering for one of the world's largest art media platforms. 11 custom plugins, AMP across 45+ templates, Redis…

AMP
CSS
Docker
Google Ads
Google Cloud
JavaScript
Kubernetes
MySQL
PHP
Redis
REST API
SEO
WordPress

Visit live site →

CORPORATE WEBSITE

WebSpellChecker — Corporate Website & Commercial Platform

Corporate website and commercial platform for WebSpellChecker, built from scratch. WooCommerce subscriptions, custom licensing REST API, 4 custom plugins, 15+…

ACF
CSS
Docker
JavaScript
MySQL
PHP
Redis
REST API
SEO
Stripe
WooCommerce
WordPress

Visit live site →

All projects →

Companies I've worked with

Artnet News
WebSpellChecker
DHL
WGames
RITE
SLP Test Prep
SPALAH

Background

A bit about me

Based in Spain, originally from Ukraine. Building for the web since 2014.

I started with WordPress freelancing, moved into product teams, and spent the last 6 years as a Senior Engineer at WebSpellChecker — working across SaaS architecture, billing systems, frontend delivery, and content platforms. I like clean code, straightforward tools, and shipping things that actually work.

10+ years in web development

50+ projects shipped

Full-stack backend to frontend to deploy

SaaS product engineering focus

WordPress
Laravel
PHP
JavaScript
TypeScript
React
Vue.js
Angular
MySQL
PostgreSQL
Redis
Docker
AWS
GitHub Actions
REST APIs
Stripe
Node.js

Contact

Want to get in touch?

Best for project context, technical questions, consulting conversations, or direct engineering opportunities. Email is the simplest path.

Email [email protected] LinkedIn linkedin.com/in/alexsinyayev GitHub github.com/lex127 Telegram @Alexs127

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