Олег

Oleh Hatsko
Senior Full-Stack C#/.NET Developer
Lviv, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
PROFESSIONAL SUMMARY
Senior Full-Stack C#/.NET Developer with 6+ years of experience building and modernizing backend-heavy products in healthcare, supply chain,
and non-profit domains. Strong in C#/.NET, ASP.NET Core, EF Core, ABP Framework, SQL Server/MySQL, Azure, authentication/SSO, high-load
modules, large refactors, integrations, webhooks, and AI features with RAG/vector search.
TECHNICAL SKILLS
Backend: C#, .NET 10, .NET Core, ASP.NET Core, EF Core, ABP Framework, Razor Pages, REST APIs, Webhooks, MVC, MVVM
Data: SQL Server, MySQL, stored procedures, SQL scripts, query/database logic, database design changes, Elastic Sync
Cloud & DevOps: Azure App Services, Azure Functions, Azure Key Vault, Azure Storage, Azure Networking, Azure DevOps, Git, deployment
scripts
Frontend: Angular, AngularJS, React, TypeScript, JavaScript, Kendo UI, jsTree
AI: RAG systems, AI chat, vector search, custom MCP servers, multi-agent workflows
PROFESSIONAL EXPERIENCE
Langate Software

Full-Stack Developer | Jul 2023 - Present | Ukraine, Remote
Project: Healthcare reputation management platform
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Design and own end-to-end product features and high-load backend modules from requirements analysis and technical design to deployment,
monitoring, and production support.
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Build and modernize backend services with C#/.NET, ASP.NET Core, ABP Framework, MSSQL, REST APIs, Azure services, and supporting
Angular/AngularJS UI components.
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Design integrations and security flows, including SendGrid, Single Sign-On, authentication/authorization, API contract analysis, webhook processing,
and production troubleshooting.
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Drive .NET 10 and Azure modernization across hosting, serverless/background components, secure configuration, storage, networking, deployment
pipelines, and diagnostics.
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Lead large refactors across legacy and modern modules, improving maintainability, reducing technical debt, and preparing modules for modernization.
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Work with MSSQL, Elastic Sync, RAG, vector search, and custom MCP servers on data synchronization, search workflows, backend processing, and
AI-enabled product features.
SoftServe

.NET Developer | Apr 2020 - Jul 2023 | Lviv, Ukraine
Projects: Healthcare inventory optimization solution; EPlast Ukrainian scouting platform
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Built backend, database, web, and mobile features for a large healthcare supply-chain inventory optimization solution as part of a team of
approximately 50 engineers.
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Designed backend components, controllers, stored procedures, SQL scripts, database logic, and selected UI/mobile features using .NET Core, MVC,
MSSQL, MySQL, and Xamarin Forms.
•
Contributed to EPlast with .NET Core, ASP.NET Core, React, EF Core, Azure Blob Storage, estimations, code reviews, refactoring, testing, debugging,
and agile delivery.
CERTIFICATIONS
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Microsoft Certified: Azure Fundamentals (AZ-900)
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Microsoft Azure Developer Associate (AZ-204) - In progress
EDUCATION
Master, Education and Pedagogics
Lviv National University | 2022 - 2024
Bachelor, Computer Science
Lviv Polytechnic University | 2018 - 2022
ADDITIONAL TRAINING
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OWASP Top 10:2021 in .NET with C# Learning Path
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Design Patterns with C# and .NET
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SoftServe IT Academy
LANGUAGES
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English - Upper-Intermediate
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Ukrainian - Native