Геннадий Косарынцев
@0005336
I build high-load PHP and Go platforms for e-commerce and marketplace operations.
KazakhstanWhat I'm looking for
I'm building and maintaining Baraholka Express’s B2B dropshipping and fulfillment platform, connecting warehouse operations with Kaspi, Wildberries, and Ozon. I develop PHP 8/Laravel backend services, REST APIs, Redis caching, and complex WMS workflows.
I also lead a team of three developers through code reviews, planning, and technical decisions, and built an Android application to automate warehouse operations.
Previously at MY.GAMES, I developed high-load services for collecting and analyzing gaming statistics, integrated monetization and advertising platforms, optimized ClickHouse analytics, and used Kafka for scalable, fault-tolerant processing. At Citilink, I spent nearly seven years designing PHP/Symfony and Go microservices for an e-commerce platform serving more than 300K daily users.
Over about 20 years in development, I’ve delivered e-commerce, booking, loyalty, payment, call-center, and CMS systems using PHP, Go, SQL databases, Docker, and frontend tools. I’m ready for relocation and work comfortably in English at approximately B2 level.
Experience
Work history, roles, and key accomplishments
● Development and maintenance of a B2B dropshipping and fulfillment platform with shipment of goods to marketplaces (Kaspi, Wildberries, Ozon).
● Participated in architecture design of the Warehouse Management System (WMS) and B2B platform.
● Developed and maintained backend services using PHP 8 (Laravel), designed and implemented REST APIs.
● Designed and optimized database structures, implemente
● 1link — a high-load system for collecting and analyzing game statistics.
● Developed backend services for high-load data collection from gaming platforms.
● Integrated the system with monetization and advertising platforms.
● Optimized ClickHouse queries for real-time analytics and reporting.
● Worked with Kafka as a message broker to ensure fault tolerance and scalability.
● Set up monitoring,
● Citilink is a large high-load e-commerce platform with over 300K daily users.
● Participated in system design and development using PHP (Symfony) and microservices in Go.
● Designed and maintained REST APIs for internal and external integrations.
● Developed and optimized services including: SEO tools, Email notification systems, PC configuration service
● Refactored legacy code, applied SOLID p
● Built a loyalty platform with partner integrations, banner management,
and simple reward-based games.
● Integrated with partners for obtaining purchase information.
● Implemented tracking tools, email marketing, payment systems,
banners, advertising blocks, statistics.
● Developed hotel booking site with integration of foreign partners
(100k+ hotels).
● Connected payment systems, user personal cabinets, search by
criteria, partner integration, statistics, etc.
● Created web interface for Asterisk-based call center, including call
routing, agent tools, managing queues and statistics.
● Worked in a classic web studio. Development and support of several sites.
● Website for my own online store. Working with clients and suppliers.
● CMS development from scratch. Authorization, messaging system, templating, search, and more.
● Testing GPS receivers, documentation
Education
Degrees, certifications, and relevant coursework
Moscow Aviation Institute (National Research University)
Master’s Degree, Radio engineering
1998 - 2004
Moscow Technical College
Bachelor's degree, Computing machines, complexes, systems and networks
1994 - 1998
Tech stack
Software and tools used professionally
Availability
Location
KazakhstanAuthorized to work in
Job categories
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