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[відкрити контакти](див. вище в блоці «контактна інформація») (Mobile)
Oleh Kozlovskyi
[відкрити контакти](див. вище в блоці «контактна інформація») .NET Developer | 1 year of experience
om Lviv, Lviv, Ukraine
[відкрити контакти](див. вище в блоці «контактна інформація»)
kozlovskyi-887670272 (LinkedIn) Experience

Top Skills NDA
Back-end розробник
ASP.NET
November 2023 - December 2024 (1 year 2 months)
.NET Framework
Working as a backend developer in a property hospital managment,
Entity Framework (EF) Core
focusing on implementing key features, ensure secure and reliable
API functionality, database managment and unit testing.
Languages
Ukrainian (Native or Bilingual)
Responsibilities:
Russian (Limited Working)
- Developing appointment scheduling functionality that enables patients to
English (Limited Working)
book and view appointments and doctors to manage their schedules.
- Managing database with PostgreSQL, performing migrations, optimizing
queries.
- Writing unit tests using xUnit, Moq and FluentAssertions to validate
functionality and improve code quality.
- Ensured API security by implementing token based authentication(JWT) and
role-based access control(RBAC).
- Worked extensively with JSON/XML files to migrate data, ensuring parsing,
transformation and storage in the database.

Achievements:
-Developed and delivered a fully functional "Hospital Management" module
ahead of schedule, enabling
secure user registration, role-based access, and appointment management,
increasing user management efficiency by 40%.
-Designed and optimized appointment scheduling functionality, allowing
patients to book and view
appointments while enabling doctors to manage their schedules, reducing
appointment processing time by 30%.
-Migrated over 2,000 records from JSON files to a structured database format
without data loss.
-Applied SOLID principles and design patterns making the codebase more
modular and extensiable,
which improved the speed of implementing new features by 35%.

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-Designed and implemented a REST API for that module, enhancing system
scalability, maintainability, and seamless integration with external services
-Adopted Clean Architecture principles, ensuring clear separation of concerns,
improved testability,
and long-term maintainability, reducing technical debt by 30%.
-Improved code maintainability and system stability by increasing test
coverage to 80% with xUnit based unit testing.
-Developed secure JWT-based authentication, which complies with modern
security standarts.

Education
West Ukrainian National University
Bachelor's degree, Computer Engineering · (September 2022 - June 2023)

West Ukrainian National University
Bachelor's degree, Information Systems and Technologies · (September
2022 - June 2023)

Sambir technical college of economics and computer science
Junior Specialist`s Degree, Computer Software Technology/
Technician · (September 2015 - June 2019)

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