Valentyn

Valentyn Lieshchuk Košice, Slovakia
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.NET Backend Developer ð valentyn-lieshchuk-2b89a3299

Profile
.NET Backend Developer with commercial experience in e-commerce and backend service development.
Currently pursuing a Master’s degree in Intelligent Systems at the Technical University of Košice. Focused
on ASP.NET Core, API design, microservices, data-driven analytics, and reliable backend architecture.
Seeking a Junior .NET Backend Developer role focused on building scalable backend services.

Technical Skills
Backend ASP.NET Core, REST APIs, Entity Framework Core, MVC, Clean Architecture, Microser-
vices
Languages C#, Python, C (basic)
Databases MS SQL Server, PostgreSQL, MongoDB
AI / Data Pandas, NumPy, scikit-learn, data processing, sentiment analysis, data visualization
Tools Git, Postman, Swagger/OpenAPI, SQL Server Profiler, Docker (basic), xUnit

Experience
03/2026 – .NET Backend Developer, E-commerce Platform, Remote
Present Developing backend features for a Ukrainian Shopify-like e-commerce platform using ASP.NET
Core, C#, Entity Framework Core, SQL Server, and MongoDB.
○ Contributed to API development, validation, localization, Swagger/OpenAPI documentation,
and business statistics features.
○ Implemented and tested reporting functionality for store owners, including order analytics,
grouped statistics, repeat customers, and UTM-based metrics.
○ Tested API endpoints, compared results with SQL queries, and used SQL Server Profiler to
analyze generated queries and performance.
○ Used Python for data analysis and visualization of business and product-related metrics.

Projects
2024 Mobile App for Diabetes Detection, .NET MAUI, XAML, Python
Implemented a Naive Bayes model for diabetes risk estimation, designed a responsive mobile UI,
and integrated a Python-based backend component.
2026 CityConnect, AI-powered citizen feedback platform
Contributed to backend and system development for issue reporting, sentiment analysis, issue
prioritization, and automated severity classification in urban environments.
2026 BreamStudy, breamstudy.com
Founder and technical lead of an EdTech startup focused on tutor discovery and session booking.
Led MVP planning, product architecture, development roadmap, and implementation using .NET,
React, and PostgreSQL.

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Education
2025 – 2027 Master’s Degree – Intelligent Systems, Technical University of Košice
2022 – 2025 Bachelor’s Degree – Intelligent Systems, Technical University of Košice

Languages
Slovak Advanced
English Intermediate, technical communication

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