Vitaliy

Email: [open contact info](look above in the "contact info" section)
VYRKOLICH VITALIY LinkedIn: Vitaliy Vyrkolich
Phone:+0967552925
.NET DEVELOPER
Location: Ukraine, Odesa

Computer Science professional specializing in C# and .NET development with hands-on experience
building secure, scalable, and efficient software solutions. Recognized for strong analytical thinking and
the ability to quickly adapt to new technologies, I thrive in dynamic, collaborative environments and am
passionate about delivering innovative projects.

PROFILE SUMMARY

• .NET Developer with a 1-year experiens, strong background in Custom Software Development and
Web Development, offering professional services on LinkedIn.
• Experience working in dynamic and fast-paced environments, collaborating with SCRUM teams in
product companies and startups to deliver high-quality solutions.
• Skills in back-end development, including C#, .NET/.NET Core, ASP.NET, REST, Docker, PostgreSQL.
• Intermediate English, enabling effective communication with clients and seamless business
interactions.

SKILLS

Core Concepts:
Technologies:
• Object-Oriented Programming
• C#/.NET (OOP)
• .NET Framework 4.8+/Core 3.1+ • SOLID principles & Design Patterns
• ASP.NET Core (MVC, Web API) • Data structures and Algorithms
• PostgreSQL
Languages:
• Entity Framework Core
• xUnit, Moq • English: Intermediate
• Git, Docker • Ukrainian: Native

WORK EXPERIENS:

Responsibilities:

• Development and maintenance of APIs for modules of the hotel business automation system (e.g.,
client management, bookings, services).
• Implementation and support of CRUD operations within the project’s business logic.
• Identification and resolution of application errors, ensuring API stability and correctness.
 • Participation in configuring and integrating middleware components (logging, global error
handling, JWT authentication).
• Working with PostgreSQL database, configuring relationships between entities using Fluent API.
• Writing console tools for data migration and processing.
• Participating in code reviews and improving code quality based on feedback received.
• Developing and maintaining unit tests using xUnit and Moq.
• Maintaining internal technical documentation for completed tasks.

Achievements:

• Developed secure JWT-based authentication aligned with modern security standards, significantly
improving user authorization reliability.
• Created a console application to automate data migration from JSON files to PostgreSQL,
streamlining initial data loading and integration.
• Implemented a global exception handler to standardize error responses and facilitate debugging
across environments.
• Optimized database relationships via Fluent API, indexing, and refined entity configurations,
cutting query execution time by 40%.
• Applied SOLID principles and design patterns to improve code modularity and extensibility,
accelerating feature development by 30%.
• Enhanced code maintainability and system stability by increasing test coverage using xUnit and
mocking key components.
• Contributed to API endpoint optimization, boosting response speed and reducing server load
through improved request handling and caching.

EDUCATION SEPTEMBER 2021 – MAY 2025

Odesa Professional College of Communication and Informatization

CERTIFICATIONS Group Mentorship C#/.NET