Roman Kasianchuk
@romankasianchuk1
I build high-load backend services and financial platforms with PHP, Go, and distributed systems.
UkraineWhat I'm looking for
I've built high-load backend services, microservices, and financial platforms for OxTech LLC, including Symfony 5/6/7 applications, high-performance Go services, and a concurrent HTTP proxy service.
I design and optimize PostgreSQL and MySQL architectures, queries, and indexes, and have introduced Redis caching plus RabbitMQ and Redis queues for background processing. My work also includes Asterisk VoIP integrations, CRM platforms, APIs, Odoo ERP integrations, and an international mobile top-up financial platform.
I mentor junior developers and bring hands-on experience managing production servers, Linux infrastructure, and performance-focused distributed systems.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
OxTech LLC
Oct 2018 - Sep 2025 (6 years 11 months)
Developed backend services using Symfony 5/6/7, designed and optimized PostgreSQL/MySQL database architecture, implemented high-performance Go services including proxy service handling concurrent HTTP requests, Asterisk VoIP integration, and mentored junior developers.
Fullstack Developer
MicroCash LLC
Apr 2018 - Apr 2018 (0 months)
Developed CRM features using Laravel/OctoberCMS, integrated Odoo ERP with internal systems, and implemented VoIP integrations with Asterisk.
Backend / Fullstack Developer
Visk LLC
Jan 2016 - Mar 2017 (1 year 2 months)
Developed backend systems, CRM platforms, APIs, and business logic using MySQL/MariaDB, Memcached/Redis, payment integrations, and server management. Built backend for international mobile top-up financial platform.
PHP Developer
ITFAN
Jan 2015 - Jan 2015 (0 months)
Developed websites and business integrations for client projects using PHP, JavaScript, HTML, CSS, and 1C-Bitrix API.
CNC Automation Specialist
Specialist LLC
Jan 2014 - Jan 2014 (0 months)
Designed, built, programmed, and launched CNC machines and automated production systems.
CNC / IT Specialist
Zenitech Ukraine LLC
Jan 2010 - Jan 2013 (3 years)
Supported clients, resolved production issues, worked with international equipment suppliers, and administered Linux Ubuntu/Windows Server infrastructure.
Technical Support / Server Monitoring
Xasax Corporation
Jan 2008 - Jan 2009 (1 year)
Monitored servers and supported US customers for commercial and financial data services.
System Administrator / Website Administrator / Designer
AACrown
Jan 2007 - Jan 2008 (1 year)
Administered office IT infrastructure, supported company website, and handled design-related tasks.
Sales Assistant
Private Enterprise Grinevich
Jan 2005 - Jan 2007 (2 years)
Sold mobile phone accessories and worked directly with customers.
Education
Degrees, certifications, and relevant coursework
Dnipro High School #137
High School Diploma, General Education
Completed high school education at Dnipro High School #137.
Tech stack
Software and tools used professionally
Availability
Location
UkraineAuthorized to work in
Job categories
Skills
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