Custom websites and web apps using Symfony, Twig, and modern front-end tools.
RESTful & WebSocket APIs for communication between services, apps and IoT devices.
Process automation, cron jobs, and integrations that save your time and money.
Secure code, speed optimization, logs, backups & protection for sensitive data.
Help with architecture, DevOps, or project planning for your tech product.
MongoDB, MySQL, Doctrine ORM — I structure, optimize, and manage your data
Hello, I'm Valentyn Yakunchykhin — a full stack developer with a strong focus on PHP (Symfony), Node.js, APIs, and backend systems. I specialize in building scalable business tools such as websites, CRM systems, reporting platforms, and API-based integrations.
I have practical experience working with clients from the EU and Ukraine, deploying solutions for both startups and established businesses. I value clarity, simplicity, and long-term technical maintainability.
I specialize in full stack web development with a strong backend focus. I build scalable systems, APIs, admin panels, and integrate databases and services in a clean and maintainable way.
Maintaining and developing a complex CRM (Symfony), API (Node.js), and Tournament System (TypeScript). Implemented WebSocket communication with IoT devices. Migrated legacy code to Symfony 7.2 with SOLID principles and Symfony Messenger. Managed infrastructure (OVH, MyDevil), documentation (Swagger, Markdown), and unit testing (PHPUnit, Mocha, Sinon).
Maintained CRM system based on custom PHP framework. Implemented features, bugfixes, and integrations in production environment.
Worked on e-commerce features, payment integrations (PayU, PayPal, Fondy), email marketing via SOAP, admin panel extensions, refactored legacy code into service-based structure.
Created custom WordPress themes and plugins. Developed web apps in PHP, jQuery, and Yii2 framework. Cooperated with international clients on long-term projects.