Mykola

Nikolay Krasikov
.NET / C# Engineer

📧 [відкрити контакти](див. вище в блоці «контактна інформація»)
📱 [відкрити контакти](див. вище в блоці «контактна інформація»)
🌐 LinkedIn

Professional Summary
.NET / C# Engineer with 15+ years of commercial experience developing, maintaining,
and modernizing enterprise and high-load applications. Strong expertise in C#, .NET,
ASP.NET Core, Web API, REST APIs, Entity Framework Core, SQL Server, and
distributed systems.

Experienced in developing scalable web applications, designing and integrating REST
APIs, optimizing application and database performance, modernizing legacy systems,
investigating production issues, and delivering maintainable solutions throughout the
full software development lifecycle. Strong knowledge of OOP, SOLID, Design Patterns,
Dependency Injection, and clean code.

Experienced in code reviews, requirements analysis, technical discussions, solution
design, production support, and collaboration with distributed development teams.
Comfortable working independently and communicating with technical and non-
technical stakeholders.

Technical Skills
Languages:
C#, T-SQL, PL/SQL, JavaScript, TypeScript

.NET & Web:
.NET Framework 4.x, .NET Core, .NET 8, ASP.NET MVC, ASP.NET Core, Web API, Entity
Framework Core, Entity Framework, Windows Services

API & Integration:
REST APIs, API Design, Client-Server Architecture, Authentication, Authorization, API
Security, External API Integration, System Integration

Architecture & Development:
OOP, SOLID, Design Patterns, Dependency Injection, Clean Code, Refactoring,
Distributed Systems, Microservices, SOA, Event-Driven Architecture

Databases:
Microsoft SQL Server, PostgreSQL, Oracle, MySQL, T-SQL, LINQ, SQL Query
Optimization

DevOps & Tools:
Git, GitLab, CI/CD, Jenkins, AWS (S3, SQS, SNS), IIS, Jira, Confluence

Frontend:
JavaScript, TypeScript, React.js, HTML, CSS, jQuery, ExtJS

Testing & Quality:
NUnit, Unit Testing, Code Reviews, Refactoring

Messaging:
RabbitMQ, Pub/Sub

Professional Experience
Senior Software Engineer
INTETICS INC., Kharkiv, Ukraine
Oct 2020 — Present

Project: Enterprise E-commerce Platform

Key Contributions:

· Developed and maintained enterprise web applications using C#, .NET, ASP.NET
Core, ASP.NET MVC, Web API, Entity Framework, and Microsoft SQL Server.
· Designed and implemented REST APIs and integrations with internal and
external systems.
· Developed scalable backend solutions and optimized application logic,
multithreaded processing, and SQL queries for high-load scenarios.
· Maintained and modernized a large legacy codebase through refactoring and
architectural improvements while preserving system stability and backward
compatibility.
· Investigated complex production issues, performed root cause analysis, and
implemented solutions to improve reliability and stability.
· Participated in code reviews and improved code quality, maintainability, and
adherence to SOLID and clean-code principles.
· Collaborated with developers, project managers, QA, and stakeholders on
requirements clarification, technical discussions, planning, and solution design.
· Maintained and improved CI/CD pipelines and supported production deployments
and troubleshooting.
· Worked effectively in a distributed development environment and participated in
the full software development lifecycle.

Tech Stack:
C#, .NET Framework 4.x, .NET Core, .NET 8, ASP.NET MVC, ASP.NET Core, Web API,
Microsoft SQL Server, Entity Framework, Windows Services, JavaScript / TypeScript,
Jenkins, IIS

Senior Software Engineer
SIGMA SOFTWARE, Kharkiv, Ukraine
Dec 2016 — Sep 2020

Project: Enterprise Case & Document Management Systems

Key Contributions:

· Designed and implemented new modules and features for enterprise web
applications using C#/.NET and ASP.NET.
· Developed and maintained REST APIs for integration with internal and external
systems.
· Contributed to architectural improvements focused on scalability, modularity,
maintainability, and clean code.
· Designed and implemented asynchronous communication between distributed
components using RabbitMQ and publish/subscribe messaging patterns.
· Developed backend services and distributed components for enterprise
applications.
· Performed code reviews and contributed to maintaining development and code-
quality standards.
· Optimized database queries and backend logic to improve application
performance.
· Diagnosed and resolved critical production issues and performed root cause
analysis.
· Collaborated with developers, project managers, and other team members on
requirements analysis and technical solution design.

Tech Stack:
C#, .NET / .NET Core, ASP.NET, WinForms, Microsoft SQL Server, RabbitMQ,
JavaScript, Git / GitLab, IIS

Software Engineer
AMTOSS, Kharkiv, Ukraine
Nov 2011 — Nov 2016

Project: Large-scale Billing System

Key Contributions:

· Designed and implemented features for a high-load billing system involving
complex data processing.
· Built backend components and services using C#/.NET.
· Worked with multiple architectural approaches, including Service-Oriented
Architecture (SOA).
· Implemented and maintained internal service integrations.
· Investigated and resolved complex technical issues reported by customers.

· Communicated directly with customers to clarify requirements, discuss technical
solutions, and resolve issues.
· Participated in onboarding and knowledge transfer for new team members.
· Worked in a distributed international development environment.

Tech Stack:
C#, ASP.NET, WCF, Entity Framework, JavaScript, ExtJS, Microsoft SQL Server / Oracle

Education
Master’s Degree — Electronic Devices and Appliances
National University of Radio-electronics, Kharkiv, Ukraine

Languages
English — Upper-Intermediate
Ukrainian — Native
Russian — Native