Kyrylo

KYRYLO FEDCHUN
Senior .NET / Full Stack Software Engineer
Lutsk, Ukraine / Remote [open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section) inkedin.com/in/kyrylo-fedchun-a2a56a283/

upwork.com/freelancers/~0150b21ed5de65016f

PROFESSIONAL SUMMARY
Results-driven Senior .NET Full Stack Engineer with over 5 years of experience architecting, scaling, and maintaining
enterprise web applications, microservices, and cloud ecosystems. Deep expertise across modern and legacy .NET stacks
(C#, .NET 8, ASP.NET Core Web API, Blazor, EF Core, MassTransit) alongside modern frontend platforms (Angular, Vue.js).
Proven track record of optimizing high-throughput relational databases, refactoring monolithic legacy codebases into event-
driven microservices, and leading cloud infrastructure projects on Microsoft Azure.

CORE COMPETENCIES
Backend & Architecture: C#, .NET 8 / Core, ASP.NET Core Web Messaging & Async: MassTransit, RabbitMQ, Azure Service Bus,
API, MVC, Blazor, Microservices, Domain-Driven Design Multithreading, TPL, Asynchronous Processing
Data & Persistence: MSSQL Server, EF Core, Dapper, MongoDB, Frontend & Web UI: TypeScript, JavaScript, Angular, Vue.js,
T-SQL, Stored Procedures, Index Tuning HTML5, SASS/CSS3, Responsive Design
Cloud & DevOps: Microsoft Azure (App Services, Functions, Quality & Practices: OOP, SOLID, Clean Architecture, Unit Testing
SQL), Docker, CI/CD Pipelines, Git (xUnit/NUnit), Code Reviews, REST

PROFESSIONAL EXPERIENCE

Senior .NET Software Engineer & Technical Consultant | Freelance / EnterpriseContracts Feb 2023 – Present
Architected and deployed cloud-native RESTful Web APIs on Microsoft Azure using ASP.NET Core, serving high-concurrency
client applications with over 20,000 daily active users.
Implemented an event-driven messaging layer using MassTransit and message queues, decoupling microservices and cutting
peak system latency by 35%.
Modernized legacy enterprise architecture (.NET Framework, Web Forms, WinForms) by refactoring monolithic platforms into
modular REST APIs backed by EF Core and Dapper.
Engineered secure payment processing pipelines using Stripe API and ASP.NET Identity, ensuring complete PCI-DSS
compliance and OAuth2/JWT security standards.
Developed high-frequency algorithmic trading strategies and custom financial indicators in C# for the NinjaTrader platform
utilizing multithreaded data streams.

C# .NET Full Stack Software Engineer | Mint Soft May 2021 – Jan 2023

Led end-to-end full-stack feature development utilizing ASP.NET Core MVC, Blazor (Server & WASM), and Angular.
Optimized complex relational schemas and T-SQL Stored Procedures in MSSQL, improving query execution plan efficiency and
boosting data reporting throughput by 45%.
Architected a dual-ORM data access layer, pairing Entity Framework Core for business domain operations with Dapper for high-
performance read-heavy queries.
Delivered real-time telemetry dashboards in Blazor WebAssembly utilizing WebSockets for streaming data visualization.
Full Stack / Frontend Developer | Tech Solutions Inc. Jan 2019 – Apr 2021

Spearheaded the migration of a high-traffic legacy PHP application to a modern Vue.js single-page application (SPA)
architecture, reducing client-side render times by 50%.
Built reusable component libraries and responsive UI systems using HTML5, SASS, and JavaScript/Axios to streamline
integration across backend API teams.

EDUCATION LANGUAGES
Bachelor of Science in Computer Science & Information Technology Ukrainian: Native
Lesya Ukrainka Volyn National University (LUVNU) English: Professional Working (B2)
2019 – 2023