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Yurii Kovalchuk

@yuriikovalchuk

Message

Experienced C#/.NET and PHP developer focused on backend systems.

Ukraine

Message

What I'm looking for

I seek backend or full-stack roles where I can work on API-driven systems, perform migrations and optimizations, and grow with a collaborative team that values quality and learning.

I am an experienced backend developer with strong practical knowledge in C#, .NET 6 MVC and PHP (YII2), delivering commercial projects over three years across insurance and web domains.

I have built and migrated backends, including a complete new project with OAuth 2.0 authorization, REST APIs for frontends, and admin panels, and I migrated systems from .NET 5 to .NET 6 and from MSSQL to PostgreSQL.

My PHP/YII2 work includes supporting and improving large projects, writing migration code for complex tree-structured data, and maintaining live sites; I also maintain and fix frontend issues (HTML/CSS/JS) when needed.

I value deadlines, attention to detail, continuous learning, and collaborative teamwork, and I bring practical experience with Git, Docker, Composer, ELK and relational databases.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Private Company

Jun 2022 - Present (3 years 4 months)

Maintained and upgraded insurance-domain projects, migrated .NET 5 to .NET 6 and MSSQL to PostgreSQL, and developed a new backend with OAuth2, APIs and an admin panel. Delivered feature enhancements and new services to improve system reliability and functionality.

C++.NET 5 6 MVC OAUTH2 PostgreSQL Docker Git

Current

Web Developer (Freelance/Contract)

Current

1552.com.ua

Jan 2019 - Present (6 years 9 months)

Performed ongoing frontend and backend fixes (HTML/CSS/JS/PHP) and provided SEO promotion and development work to improve search rankings and site performance. Implemented link building and on-page optimization strategies.

HTML CSS JavaScript PHP SEO CMS MySQL

Junior PHP Developer

Private Company

Nov 2021 - Feb 2022 (3 months)

Supported and enhanced YII2 projects and a large Bitrix system, and performed database migrations from MSSQL to MySQL including recursive tree-structure migration routines. Improved functionality and stability across legacy systems.