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[открыть контакты](см. выше в блоке «контактная информация») (Mobile)
Oleh Kozlovskyi
[открыть контакты](см. выше в блоке «контактная информация») .NET Developer | 1+ year of experience
om Lviv, Lviv, Ukraine
[открыть контакты](см. выше в блоке «контактная информация»)
kozlovskyi-887670272 (LinkedIn) Experience

Top Skills Startup
.Net Backend developer
ASP.NET
May 2025 - Present (7 months)
Entity Framework (EF) Core
Working as a .NET Backend Developer on a platform for digitizing catering
Microsoft Azure
processes.

Languages
Responsibilities:
Ukrainian (Native or Bilingual)
- Developed core business logic for the platform, ensuring scalable and
Russian (Limited Working)
maintainable backend architecture.
English (Limited Working)
- Implemented a custom exception handling system using ProblemDetails and

Certifications Action Filters, significantly improving error clarity and API consistency.
- Wrote comprehensive integration tests to ensure reliability and correctness of
EPAM: IT Marathon 4.0
key application flows.
- Integrated DeepL API to automate menu translation, including implementing
asynchronous background processing for large translation workloads and
deploying these background jobs to Azure.
- Collaborated with the team to design and refine the database schema,
ensuring optimal structure for menu items, translations, and restaurant
configurations.
- Implemented QR-code generation logic to provide restaurants with scannable
links to their digital menus.
- Developed backend integration with Azure Storage for managing media and
other assets.
- Added robust input validation using FluentValidation, improving API safety
and reducing invalid data flow.

Achievements:
- Delivered a stable translation pipeline that offloaded heavy processing to
background jobs, improving overall system responsiveness by approximately
40% and reducing average user wait times by 30–50%.
- Improved application reliability through enhanced exception handling and
automated integration testing, reducing the number of unhandled errors by
around 60%.

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- Contributed to a more scalable storage architecture by integrating Azure
Storage for asset management, cutting storage-related costs and improving
file management efficiency by about 25–35%.
- Streamlined the onboarding process for restaurants by automating QR-code
generation and translation workflows, reducing the time required to onboard a
new restaurant by roughly 50%.

Team Challenge
.Net Backend developer
March 2025 - May 2025 (3 months)
Working as a .Net Backend developer in a property fashion e-commerce
marketplace.

Responsibilities:

- Developed backend functionality for uploading and managing product
images, including validation, processing, and secure storage.
-Implemented automated image compression, reducing file sizes by 4x to 10x,
which minimized storage costs and significantly improved product page load
times for users.
- Built and integrated an email notification service using Brevo (formerly
Sendinblue) to support features such as email verification, password reset,
and user account notifications.

Achievements:
- Delivered a complete image management module that helped reduce cloud
storage usage by over 75% and improved frontend performance across
product listing and detail pages.
- Implemented a reliable transactional email service that improved user
engagement and onboarding experience by automating key communications.

NDA
Back-end розробник
November 2023 - December 2024 (1 year 2 months)
Working as a backend developer in a property hospital managment,
focusing on implementing key features, ensure secure and reliable
API functionality, database managment and unit testing.

Responsibilities:

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- Developing appointment scheduling functionality that enables patients to
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%.
-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)

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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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