Yevhen Oleynik
@yevhenoleynik
Full-stack .NET developer delivering web and mobile solutions with robust backend expertise.
UkraineWhat I'm looking for
I am a full-stack .NET developer with 4+ years of commercial experience building web and mobile applications, skilled across frontend and backend stacks. I specialize in ASP.NET, Angular, GraphQL, and mobile frameworks such as Xamarin and MAUI, and I contribute to architecture, feature development, and optimization.
My work includes internal portals, real estate search platforms, and agent-focused systems where I led end-to-end development, API enhancement, legacy refactoring, and test automation to improve performance and reliability.
I also build open-source projects—most recently an API gateway (API200)—covering frontend, backend, DB work, and self-hosting setup, and I actively use cloud, containerization, and DevOps tools to deliver production-ready systems.
Experience
Work history, roles, and key accomplishments
Middle .NET Full Stack Developer
Brightgrove
Dec 2023 - Present (1 year 9 months)
Designed and developed a large web/mobile platform for real estate agents, improved GraphQL .NET API, refactored legacy APIs, and implemented unit and integration tests to enhance scalability and maintainability.
PPBuilt API200, an open-source gateway for third-party API management with autogenerated code, docs, auth, caching and error handling; implemented frontend, backend, DB and self-hosted deployment.
Middle .NET Full Stack Developer
Brightgrove
Oct 2021 - Dec 2023 (2 years 2 months)
Contributed to web and mobile real-estate search app for New York, developed and optimized frontend/back-end features, reduced bugs and improved performance and user experience.
Junior .NET Full Stack Developer
Brightgrove
Jul 2021 - Oct 2021 (3 months)
Developed internal company portal features (time tracking, meetings, PTO, contacts), performed DB work with EF Core, optimized features and fixed bugs to improve reliability and usability.
Education
Degrees, certifications, and relevant coursework
KUKharkiv National Aerospace University
Master's Degree, Software Engineering
2023 - 2024
Completed a Master's degree in Software Engineering with coursework and projects focused on advanced software development practices.
VUV. N. Karazin Kharkiv National University
Bachelor's Degree, Computer Science
2019 - 2023
Earned a Bachelor's degree in Computer Science covering core topics in programming, algorithms, and systems.
Availability
Location
UkraineAuthorized to work in
Portfolio
github.com/API-200/api200Job categories
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