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YAROSLAV KOPIIKA
Kriviy Rih, Ukraine
FULL STACK (.NET + JS)
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SUMMARY
Full-Stack Developer with 7 years of commercial software development experience,
including 4 years specializing in C#/.NET. Experienced in building and maintaining scalable
order processing systems for retail and supermarket chains using ASP.NET Core, SQL
Server (T-SQL), and JavaScript. Skilled in designing RESTful APIs, developing new
features, maintaining existing systems, and improving application performance and
reliability. Familiar with cloud concepts, containerization, and modern software
development practices.

CORE SKILLS
.NET (Framework, Core), ASP.NET Core, Entity Framework Core
JavaScript (ES6), HTML5, CSS3, LESS (basic), React (basic)
SQL, MS SQL Server(T-SQL), MySQL
SharePoint, K2
Git, Docker (basic)
Razor Pages (basic), Blazor (basic)
LINQ, AutoMapper
OOP, SOLID, Dependency Injection (DI), MVC Architecture, Design Patterns
ADDITIONAL SKILLS
Windows Forms, C++, MFC
OpenGL, Java + Android Studio

WORK EXPERIENCE
MHP - Software Engineer August 2022 – July 2026
Designed and built a scalable EDIN-integrated order processing engine with flexible
XML parsing and validation, streamlining the onboarding of major retail chains including
Auchan, Glovo, and Epicenter.
Designed and developed scheduled C# Windows Services for SharePoint migration and
document archiving, processing over 1 million documents from multiple data sources.
Utilized SQL Server stored procedures, multithreading, retry policies, structured
logging, automated email notifications, and SharePoint integration.
Designed, developed, and maintained 8+ Ocelot-based microservices and RESTful
APIs using ASP.NET Core, implementing SQL Server and 1C integrations, OData
endpoints, AutoMapper mappings, Entity Framework Core and Swagger/OpenAPI
documentation.
Implemented dynamic UA/EN localization for K2 forms using JavaScript,
MutationObserver, and SQL Server, automatically detecting browser language, loading
translations from the database, localizing dynamic UI elements, and adding a persistent
"Don't show again" preference for ~300 daily internal users.
 Architected a .NET Framework/.NET Core integration solution adopted across 10+ C#
projects and 10+ K2 projects.
Refactored and stabilized an HTML/CSS/JavaScript-based PDF viewer, resolving
layout and rendering issues by redesigning the UI with CSS Flexbox and improving
JavaScript logic in Nintex K2.
Built a document-to-PDF converter application handling 200-500 automated daily
requests via CLI and Windows batch scripts.
Optimized K2 workflows and developed C# backend logic for Smart Maintenance,
supporting 200-300 daily active users.
Built and maintained K2-based business applications and user interfaces using
JavaScript (ES6). Developed and optimized SQL Server/MySQL queries and stored
procedures, improving execution time and reducing order processing failures.

Software Developer (Contract) January 2019 – July 2022

Developed 2D/3D C++/MFC/OpenGL desktop applications for quarry operators,
enabling visualization and industrial management.
Implemented custom UI components, file upload functionality, and drag-and-drop
interactions with JavaScript (ES6).
Gained practical experience with Java and Android Studio while developing Android
application features.
Implemented new features and resolved defects across multiple commercial desktop
and web applications under senior developer guidance.

EDUCATION

State University of Economics and Technology: Bachelor of Software
Engineering - Graduated June, 2022.

State University of Economics and Technology: Master of Software
Engineering - Graduated January, 2024

LANGUAGES

Ukrainian — Native
English — Upper-Intermediate