Данил

Danylo Serdiukov
mail: [open contact info](look above in the "contact info" section)
mobile: [open contact info](look above in the "contact info" section)
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Profile
.NET developer with experience in building Windows applications and services. Worked with
client-server interaction, real-time communication (SignalR), and business logic
implementation in the service layer.

Experienced in asynchronous programming, working with APIs (HTTP), implementing retry /
reconnect scenarios, and authorization logic. Worked with BLE (Windows stack + integration
with mobile .NET), and participated in improving the mobile part of the application using
.NET MAUI (Android).

Focused on code quality, clean architecture, and growth in backend development.

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Key Competencies
● C#, .NET 8/9, nullable reference types
● Development of Windows desktop applications and background services
● Client-server interaction, API integration, request/response and error handling
● Asynchronous programming: async/await, Task, retry / reconnect scenarios
● Business logic implementation in the service layer
● Architectural separation of concerns: UI / Service / Common, Dependency Injection
● Data handling: SQL, LINQ, basic database interaction
● .NET MAUI: participation in mobile application development
● Unit testing of core logic

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Work Experience
.NET Developer — Hideez

April 2023 — April 2026

Responsibilities:

● Development and maintenance of Windows client applications and background
services
 ● Implementation of client-server interaction (SignalR, HTTP), request and response
handling
● Business logic implementation in the service layer
● Use of asynchronous programming for network and I/O operations
● Implementation of retry / reconnect scenarios and network error handling
● Work with authorization logic and integration with backend services
● Implementation and support of BLE communication between devices
● Integration with Windows Credential Provider (IPC / named pipes)
● Work with Virtual Smart Card (VSC), certificates, and TPM (Microsoft.TSS), COM
interop
● Application architecture design (UI / Service / Common), use of Dependency
Injection
● Writing unit tests for core scenarios
● Participation in improving the mobile application (.NET MAUI, Android):
implementation and support of business logic, UI changes, navigation handling,
adaptation during migration to a newer .NET version
● Work with Android-specific aspects: permissions setup, application lifecycle, BLE
integration
● Use of MVVM pattern (CommunityToolkit.Mvvm)
● Logging and diagnostics (NLog, generic host)

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Education

Computer Academy “STEP”

Program focused on software development: fundamentals of programming, OOP, and
algorithms.
After initial training (C++, administration), the main focus shifted to development using C#
and .NET.

During the studies gained experience with:

● C#, .NET
● OOP, basic algorithms and data structures
● Working with databases (SQL)
● ASP.NET (basic level)
● Desktop application development (WinForms, WPF)

Practical experience Development of a desktop application integrated with a database

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Languages
● Ukrainian — Native
● English — B1 (actively improving)