Andrii Korenev

High-load backend development for the world's leading online chess platform, serving over 10 million daily active users (DAU) and processing hundreds of millions of daily games and system events. Key Achievements & Responsibilities: Microservices & Symfony Architecture: Refactored legacy monolithic modules into high-throughput microservices using Symfony. Developed internal REST APIs and utilized Protocol Buffers (Proto) for fast inter-service communication; collaborated on cross-language integration (incl

Delivered scalable, high-performance web solutions for international clients through Upwork and direct contracts, specializing in full-stack PHP development using Laravel, Symfony, CodeIgniter, CakePHP, WordPress, and Drupal. Utilized HTML, CSS, JavaScript, jQuery, MySQL, PostgreSQL, Git, Memcached, Redis, and AWS SQS for robust, efficient applications. Key Projects: SocialHowl (Dec 2010 - Jul 2011) Built a social networking platform with PHP, CodeIgniter, MySQL, and jQuery. Included user communication too

Developed web applications for international clients through oDesk (now Upwork), primarily using the CodeIgniter framework to build scalable and efficient solutions. Contributed to projects involving WordPress and Drupal, customizing themes, plugins, and modules to meet client requirements. Gained experience in delivering high-quality code under tight deadlines, enhancing my expertise in PHP, MySQL, and CMS-based web development.

Transitioned to web development after self-studying PHP and web technologies in 2009. Initially provided technical support for web applications, resolving user issues and ensuring system reliability. Promoted to PHP Developer, where I developed PHP Forms, a web platform for visually creating forms and collecting data, and contributed to the development of an internal CRM system. Gained hands-on experience in PHP, MySQL, and web development, laying the foundation for my career as a PHP developer.

Started as a Wholesale Sales Manager, managing client relationships and driving sales of computer components. Promoted to Head of Sales Department, leading a team to achieve sales targets and coordinating procurement processes. Provided technical consultations on hardware compatibility, assembled custom PCs, and assisted the system administrator with configuring office equipment. Developed strong leadership, communication, and technical problem-solving skills, complementing my IT expertise.

Developed a people recognition system for a surveillance application using C++. Designed and implemented algorithms for real-time data processing, focusing on accuracy and performance optimization. Collaborated with a team to integrate the system into existing network infrastructure, aligning with project requirements.

For my course project at Zaporizhzhya National Technical University, I developed a messenger application for an internal network using C++ and Assembly. The project involved designing efficient network communication protocols and optimizing performance through low-level programming. This experience