Олександр

Oleksandr Kolesnyk
Middle .NET Developer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Ivano-Frankivsk, Ukraine
LinkedIn | GitHub

PROFESSIONAL SUMMARY
.NET Developer with over 1.5 years of hands-on experience in backend and full-stack development. Delivered
financial data synchronization pipelines, a Blazor-based UI for financial data, and improvements to a mapping
module and database export performance. Comfortable across REST APIs, Blazor applications, MS SQL
Server, and AWS infrastructure.
A strong team player who values clean design, continuous learning, and steady growth in scope and
responsibility.

EXPERIENCE
04.2025 - 12.2025 BigTree108
Junior NET Developer, Ivano-Frankivsk, Ukraine
Technologies: .NET Core, ASP.NET Web API, Entity Framework, SQL Server,
Blazor, WebSocket, AWS, Docker, MemoryPack
■ Synchronized and optimized the ingestion of large volumes of financial data
from a broker feed
■ Developed a convenient Blazor-based UI for working with financial data
■ Worked with AWS as part of the infrastructure

12.2025 - Present SonarTechnologies
.NET Developer, Ivano-Frankivsk, Ukraine
Driving backend development for a mapping-focused platform, improving
geolocation features and data handling performance.
Technologies: ASP.NET Core, Web API, WinForms, DevExpress, WCF,
HostingService, RabbitMQ, PostgreSQL, Firebird, Oracle SQL, MS SQL Server,
Docker, Protobuf, Map Providers, React Js
■ Improved the performance and functionality of the system's maps module,
enhancing geocoding, routing, and tile-serving capabilities
■ Optimized data export from the database, significantly reducing load on the
database server and improving overall system responsiveness
■ Refined UI controls to make working with map and location data more intuitive
■ Identified and resolved bugs while continuously shipping new features

RELEVANT EDUCATION
Bachelor of Science in Software Engineering
National University of Radio Electronics (NURE), Kharkiv, Ukraine — consistently high marks in technical
subjects

SKILLS
Backend - C#, .NET Core/.NET 8, ASP.NET Core, Web API, Entity Framework, WCF, WebSocket,
RabbitMQ, WinForms, DevExpress, Protobuf, MemoryPack
Databases - MS SQL Server, PostgreSQL, Firebird, Oracle SQL
Frontend - HTML, CSS, JavaScript, Blazor, React Js
Cloud & Infrastructure - AWS, Docker
English - B2-C1