Denys

Denys (18 years old)
Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)

Email: [відкрити контакти](див. вище в блоці «контактна інформація»)

GitHub: https://github.com/denuntren

OBJECTIVE
To obtain a Junior C# Backend Developer position to apply and enhance my skills through
project work and real-world tasks.

SKILLS
• C# / ASP.NET Core: REST API, Swagger (API documentation), BLL, DAL, JWT
authentication, CORS, AutoMapper, EF Core, Logging, MediatR (CQRS pattern).

• Design Patterns: Dependency Injection, Repository, Chain of Responsibility, Mediator.

• Databases: PostgreSQL (projects), MySQL (coursework), MS SQL Server, MongoDB.

• API Integration: Worked with Binance API, MediaStack, OpenAI API.

• Microservices & Workers: Designed and implemented microservices architecture and
background workers.

• React: SPA, Context API, Framer Motion, react-toastify, JWT token in localStorage.

• Git: version control, pull requests, publishing projects on GitHub.

• Testing: Unit testing (xUnit), API testing with Postman.

• API Documentation: Swagger (generation and validation).

• Docker: basic knowledge.

• C++: basic knowledge (OOP, STL).

• English: B1-B2 (Intermediate-Upper Intermediate).
PROFESSIONAL EXPERIENCE

Junior Backend C# Developer
• Developed and maintained backend services using C# and ASP.NET Core.

• Designed and implemented business logic for various applications.

• Created microservices and background workers for automated processes.

• Integrated multiple third-party APIs, including Binance API, MediaStack, and OpenAI API.

• Worked with MongoDB and SQL databases to store and retrieve data efficiently.

• Utilized the MediatR pattern (CQRS) to structure and separate business logic.

• Built and deployed new projects based on previously developed solutions.

• Collaborated with a tech lead, participated in code reviews, and followed development
best practices.

• Ensured the scalability and reliability of backend services through testing and
optimization.

PROJECT EXPERIENCE

Web application for order management
• Backend (C#, ASP.NET Core): REST API (Auth, Orders, Products), JWT authentication,
AutoMapper, DTOs, Dependency Injection, EF Core.

• Frontend (React): React Router v6, Framer Motion, react-toastify.

• Separation of BLL (services) and DAL (repositories, PostgreSQL).

• Version control: Git (publishing to GitHub).

• xUnit testing: (AuthController, OrdersController, AuthService, OrderService).

Team Project: E-commerce Website
• Developed as part of a 4-person university team project.

• Built a REST API using ASP.NET Core and a client-side application using React.

• Implemented features for user authentication, shopping cart, and order management.

• Integrated PostgreSQL as the database.

• Collaborated with the team using Git (pull requests, code reviews).

• Tested API endpoints with Postman and created unit tests for critical components.
EDUCATION
Incomplete higher education.

2nd-year student at Igor Sikorsky Kyiv Polytechnic Institute, majoring in Computer Science
(2023-2027).

PERSONAL QUALITIES
• Responsible and analytical.

• Quick learner and resourceful.

• Team player with a strong commitment to deadlines.

• Eager to improve in C#/.NET and databases.

PORTFOLIO (SOLO PROJECT)

Order System — Order Management System (GitHub):
https://github.com/denuntren/OrderSystem
• Description: A large-scale project for order management that includes a backend built
with ASP.NET Core, a frontend developed with React, and PostgreSQL used for data storage.

• The project was designed following the MVC principles, integrated JWT for authentication,
and utilized migrations with Entity Framework.

• Dependency Injection (DI): DI was used to register and inject dependencies in the
ASP.NET Core application, including services, repositories, and business logic components
(AuthService, ProductService, OrderService).

• API Testing: Implemented API testing using xUnit, writing unit tests for controllers and
services.