Дмитро

DMYTRO SLEPTSOV
Full-Stack .NET Developer (C# · ASP.NET · WPF)
Kremenchuk, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | linkedin.com
PROFILE
Full-stack .NET developer with 6+ years of experience designing and maintaining backend services and desktop applications in C#, .NET Core and WPF. Comfortable across the stack: REST APIs, Entity Framework and scheduled-jobs pipelines on the backend, WPF/Angular/React on the front end, with solid grounding in OOP, SOLID principles and design patterns. Experienced with SQL Server, PostgreSQL, Docker, Git and CI/CD (GitHub Actions), and used to working directly with external APIs, third-party service integrations and real-time data. Comfortable using AI coding assistants (Claude Code) to move faster without cutting corners on tests. Quick to pick up new technologies and domains, and comfortable owning a feature end to end in a remote, distributed team.
CORE SKILLS
Languages & Frameworks: C#, .NET / .NET Core, ASP.NET, WPF, Blazor
Data & Backend: Entity Framework, REST API, SQL Server, PostgreSQL, MongoDB, SQLite, SignalR, JWT, MediatR, Hangfire, Clean Architecture
Front-end: Angular, React, HTML/CSS, TypeScript/JavaScript
Tools & Practices: OOP, SOLID, Design Patterns, Docker, Git (GitHub/Bitbucket/GitLab), GitHub Actions, NUnit, xUnit, Jira, Serilog, AI-assisted development (Claude Code)
Other: Xamarin (Android/iOS), MVVM/PRISM, OIDC/SSO
EXPERIENCE
Backend Developer — SMS Traffic Analytics Platform (international client)Jun 2026 – Aug 2026
Technologies: .NET 10, ASP.NET Core, Entity Framework Core, PostgreSQL, MediatR, Hangfire, Docker, GitHub Actions, xUnit
• Contributed to a reporting platform that aggregates SMS delivery data from two independent upstream provider APIs into one unified set of reports (route performance, delivery errors, business-ops and executive overviews), consumed by a Next.js/React dashboard.
• Built backend services in a Clean Architecture solution (Domain/Application/Infrastructure/Api) using MediatR and FluentValidation for the use-case layer.
• Implemented a separate scheduled-jobs host (Hangfire) that syncs upstream data into a PostgreSQL read store on a rolling window, keeping report data self-healing and consistent with the live API.
• Set up OIDC/SSO and API-key based service-to-service authentication between the API and the jobs host.
• Wrote unit and integration tests (xUnit, Testcontainers) and configured Docker Compose deployment with automated image rollout and CI/CD via GitHub Actions.
• Used Claude Code for AI-assisted development, speeding up implementation and improving test coverage.
Desktop Developer — Automated Ticket-Booking AssistantDec 2025 – Feb 2026
Technologies: WPF, SQLite, Entity Framework, NextCaptcha, Capsolver, Hero-SMS
• Built a WPF desktop application automating ticket purchases on a ticketing marketplace, including listing parsing, automatic account creation and email/SMS verification.
• Implemented automatic SMS-based account verification using the Hero-SMS API.
• Integrated NextCaptcha and Capsolver to automatically solve reCAPTCHA v3 challenges during registration and checkout flows.
• Designed local data storage (SQLite, Entity Framework) for accounts, sessions and job state.
Backend Developer — Real-Time Data Processing PlatformJun 2025 – Nov 2025
Technologies: .NET, C#, WPF, SignalR, Serilog, TCP/IP, COM, Docker, SQL Server
• Developed and maintained backend services communicating with external devices over TCP/IP.
• Implemented real-time event processing, including detection, status updates and operational signals.
• Designed a modular architecture with clear separation of responsibilities.
• Built a logging and diagnostics pipeline with Serilog to analyze connectivity issues and unexpected events.
• Integrated hardware-related (TCP/COM) clients, ensuring stable, fault-tolerant message exchange.
Backend Developer — Internal Business PlatformJul 2024 – May 2025
Technologies: .NET, C#, ASP.NET, Entity Framework, Serilog, SignalR, SQL Server, JWT, REST API, Docker, NUnit
• Built backend services and REST APIs supporting internal business operations, admin features and data workflows.
• Designed efficient data access layers with Entity Framework Core and optimized SQL queries.
• Improved system reliability through structured logging, monitoring and error handling.
• Wrote unit tests to ensure code quality and long-term stability; collaborated with analysts to refine business logic.
Desktop Developer — Scientific Data Visualization & Analysis PlatformNov 2020 – May 2024
Technologies: C#, .NET, WPF, MVVM, NUnit, SQLite, PRISM
• Maintained and enhanced a WPF application for visualization and analysis of scientific data.
• Implemented new features including chart/table rendering and export to Excel.
• Built data-processing routines and mathematical formulas supporting analysis workflows.
• Wrote unit tests to validate data calculations and ensured core-functionality stability across large datasets.
Full-Stack Developer — Internal HR Workflow SystemDec 2019 – Mar 2020
Technologies: .NET, ASP.NET, C#, Entity Framework, SQL Server, Angular, TypeScript, REST API
• Built and optimized REST API endpoints in ASP.NET Core for request creation, validation, approval logic and status tracking.
• Designed database models and business rules with Entity Framework Core.
• Developed Angular components and UI elements for the leave-management workflow.
Backend Developer — Real Estate Data Aggregation PlatformOct 2019 – Dec 2019
Technologies: .NET, C#, ASP.NET Core, Selenium, SQL Server, Entity Framework
• Implemented and maintained Selenium-based scraping modules for automated property-data extraction.
• Worked on data parsing, transformation and unification from heterogeneous sources; built API endpoints and scheduled background tasks.
Mobile Developer — Data Acquisition & Reporting ApplicationJul 2019 – Oct 2019
Technologies: Xamarin (Native Android), MvvmCross, BLE, SQLite, Entity Framework
• Built a mobile app from scratch for collecting and processing measurement data from an external BLE device.
• Implemented document generation (Word) and on-demand printing via a portable printer over BLE.
• Created a maintainable architecture using MvvmCross and the MVVM pattern.
EDUCATION
M.Sc., Computer Science
National Aerospace University “Kharkiv Aviation Institute” — Faculty of Aircraft Control, full-time · 2015–2020
LANGUAGES
Ukrainian — native · Russian — native · English — A2 (elementary), actively improving