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Oleksandr Galiy

@oleksandrgaliy

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Senior Backend Engineer at DataArt who modernized a legacy capital markets platform into .NET 8 microservices.

Ukraine

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At DataArt, I modernized a legacy capital markets platform by migrating it to a .NET 8 microservices architecture. I owned about four services end to end, from design and implementation through release and production support.

I also cut critical high-load SQL query execution time from about one minute to about nine seconds, and built GraphQL and REST endpoints for frontend and cross-service use. I use Claude Code and GitHub Copilot daily in my development work.

At EPAM Systems, I led a team of four engineers in the media domain and designed and implemented a .NET 6 microservices architecture. I also developed REST APIs and an Excel export microservice for business reporting.

Across healthcare, industrial, and enterprise projects, I audited a legacy dental management system, developed a WPF application for elevator diagnostics, and engineered a Windows Service for identity data synchronization. In freelance work, I supported a backend service handling 10,000+ daily users and co-developed an LLM-based code review agent integrated with Jira and Confluence.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Engineer

Current

DataArt

Dec 2022 - Present (3 years 10 months)

Modernized a legacy WinForms platform to .NET 8 microservices, owning ~4 services end to end. Optimized high-load SQL queries, reducing execution time by ~85%, and built GraphQL and REST endpoints.

.NET 8+.NET Framework ASP.Net Web API GraphQL Angular WinForms Entity Framework Core Dapper MS SQL Server PostgreSQL JWT Azure AD Docker Jenkins OpenShift Openfin Quartz xUnit Moq Faker

Team Lead / .NET Engineer

EPAM Systems

Oct 2021 - Dec 2022 (1 year 2 months)

Led a team of 4 engineers, conducting code reviews and task planning while acting as the main technical contact for stakeholders. Designed and implemented a microservices architecture on .NET 6 and Entity Framework Core.

.NET 6 ASP.Net Web API REST Entity Framework Core PostgreSQL Hangfire ClosedXML xUnit Moq Git

.NET Engineer

SoftServe

Apr 2021 - Oct 2021 (6 months)

Performed a technical audit and code analysis of a legacy dental management system ahead of a large-scale database migration. Implemented JWT-based authentication to improve application security.

.NET Framework C#C++SQL MSTest TFS

.NET Engineer

GlobalLogic

Jun 2019 - Apr 2021 (1 year 10 months)

Developed and maintained a WPF application for elevator diagnostics, redesigning the UI and extending diagnostic modules. Engineered a Windows Service for multi-source data synchronization across Azure AD, SQL Server, and LDAP.

.NET Framework C#WPF XAML TCP IP Azure AD LDAP SQL Server Windows Server MSTest Moq

Freelance Backend Engineer

Freelance

Worked on a backend service handling 10,000+ daily users. Built end-to-end testing on production data with Databricks and Python, validating data jobs and sending alerts to stakeholders on failures.

Databricks Python Backend Development Testing