Oleksii Siniaiev · Senior Full-Stack Engineer
10+ years of hands-on experience across backend, frontend, payments, infrastructure, and production delivery. Laravel, Vue.js, MySQL, AWS, Docker.
Broad stack. Deep ownership. Maintainable code.
Latest
Technical articles based on real work: Laravel, architecture, performance, integrations, and practical engineering decisions.
A practical 2026 guide to Claude Code subagents with copy-paste .claude/agents examples for explorer, planner, reviewer, browser testing, model routing, context isolation, and token…
A practical May 2026 guide to using AI agents in software development safely: Claude Code, Codex, Cursor, Gemini, MCP, permissions, prompts, browser testing, subagents,…
A real-world story of leaked API keys, a panicked git filter-branch that rewrote 4 years of history, and the correct incident response we should…
Portfolio
Real projects I've shipped — from content platforms to SaaS products.
Full SaaS platform for WebSpellChecker — subscription billing with Stripe, OAuth authentication, team management, API credential provisioning, and usage analytics.…
Ongoing freelance engineering for one of the world's largest art media platforms. 11 custom plugins, AMP across 45+ templates, Redis…
Corporate website and commercial platform for WebSpellChecker, built from scratch. WooCommerce subscriptions, custom licensing REST API, 4 custom plugins, 15+…
Companies I've worked with
Background
Senior Full-Stack Engineer with 10+ years across product, outsourcing, and freelance environments. Strong across backend, frontend, integrations, infrastructure, and production delivery.
My journey started with an online store I built for my father's business while I was still in high school. It brought in real customers, and that made software feel practical from the start.
I later earned degrees in law and engineering, but chose software as my main path. Since then I have worked across freelance, outsourcing, and product teams, delivering systems with Laravel, PHP, MySQL, WordPress, Vue.js, React, billing integrations, and cloud-based delivery workflows.
What matters to me most now is ownership: understanding the whole system, making it reliable in production, and keeping it maintainable over time. Outside work, I spend time in the gym, hike in the Spanish mountains, and keep a long list of Linux and hardware projects for later.
Contact
Best for project context, technical questions, consulting conversations, or direct engineering opportunities. Email is the simplest path.
