Вадим

Vadym Korsakov
Senior .NET Backend Engineer
📍 Kyiv, Ukraine | ✉ [открыть контакты](см. выше в блоке «контактная информация») | 📱 [открыть контакты](см. выше в блоке «контактная информация») | LinkedIn:
[открыть контакты](см. выше в блоке «контактная информация»)

Professional Summary
Senior .NET Backend Engineer with nearly three decades of experience designing high-load fintech
and e-commerce systems. Expert in microservices, REST APIs, and secure payment integrations.
Delivered backend solutions for 1M+ users, reducing system downtime by 60% and improving
deployment efficiency by 90%. Experienced team leader & mentor, building scalable, maintainable,
and cloud-ready applications using .NET Core/Framework, PostgreSQL, Redis, RabbitMQ, Docker,
AWS & Azure. Skilled in using AI-assisted development tools to speed up implementation, improve
code quality, and streamline documentation.

Core Competencies
Languages & Frameworks: C#, .NET Core, ASP.NET Core, EF Core, ADO.NET, C++, NUnit, Moq

Backend & Architecture: Microservices, Event-Driven, REST APIs, High-Load Systems, System
Design, CQRS, SOLID, DRY, KISS, Clean Code

Databases & Messaging: PostgreSQL, MSSQL, SQL Azure, Redis, RabbitMQ, MassTransit, Kafka

Cloud & DevOps: Docker, Docker Compose, AWS S3, Azure Storage, Kubernetes, CI/CD (TeamCity,
Azure DevOps)

Methodologies & Tools: Agile/Scrum, SDLC, Design Patterns, Code Review, Git, Swagger, Postman,
Visual Studio, Rider

AI & Automation: AI-assisted development, prompt engineering for LLMs, using ChatGPT, Claude
and Gemini for research, documentation, and task automation, working with AI agents and agentic
workflows

Professional Experience
Globaldev Group – Kyiv | Senior Backend Developer (.NET)

09/2024 – 06/2026 | Fintech Platform – Payment & Loan Processing

- Developed loan payment algorithms, automating interest & principal calculations.
- Reduced system outages by 60% with event-driven microservices (RabbitMQ).
- Containerized backend services with Docker, enabling daily releases and reducing
deployment failures by 90%.
- Integrated AWS S3 for secure document storage with 100% availability.
- Mentored 10+ developers, reducing technical debt by 30%.
- Worked with CI/CD pipelines for build, test, and deployment automation.

Tech Stack: C#, .NET Core, EF Core, PostgreSQL, RabbitMQ, Docker, AWS S3, Firebase, REST
API, Swagger, CI/CD pipelines.
Guru Software – Kyiv | Senior Backend Developer (.NET)

08/2022 – 09/2024 | High-Traffic E-commerce Platform

- Integrated multi-provider payment gateways, achieving 99% uptime.
- Optimized SQL and implemented Redis caching, reducing API response time by 40% under
peak load.
- Refactored legacy codebase, cutting technical debt by 35% and accelerating feature delivery
by 25%.
- Scaled platform for 3x higher concurrent traffic during promotional campaigns.
- Implemented image scaling and Azure-based storage for static assets, reducing page load time
and improving content delivery performance.

Tech Stack: C#, .NET Core, MSSQL, SQL Azure, Redis, RabbitMQ, Docker, Azure Storage, Azure
DevOps

FOZZY GROUP – Kyiv | Senior Backend Developer (.NET)

06/2012 – 08/2022 | High-Traffic Retail Platform

- Delivered high-availability backend services for mobile banking & loyalty platforms (1M+
users, 99% uptime).
- Built high-load notification & QR code services, processing 500,000+ events daily.
- Designed microservices for third-party integrations, reducing error rates by 50%.
- Optimized database queries, improving key operation response times by 35%.
- Implemented DevOps practices (Docker, TeamCity), reducing manual errors by 80%.

Tech Stack: C#, .NET Core/Framework, MSSQL, ADO.NET, RabbitMQ, Docker, TeamCity

Prominvestbank – Mariupol | Senior Software Engineer / Head of Computer
Technology Sector

04/1996 – 06/2012 | Fintech, CRM, Financial Services

- Automated retail banking workflows, reducing manual processing by 80%.
- Enhanced international payment processing, achieving 99% reliability.
- Maintained ATM network (140+ devices) with 99% uptime.

Tech Stack: C#, MSSQL, C++ Builder, FoxPro 2.6, SQL Sybase Anywhere

Education
Donetsk National Technical University | Master’s degree in Software Engineering, 1991–1996

Certifications
- K2 Five: Core, K2 Training Course, 2019
- M20487 Developing Windows Azure and Web Services, Networking Technologies, 2016
- Patterns of Design, CyberBionic Systematics, 2014
Additional Expertise
- Backend Architecture & Scalability
- High-Load Systems & Microservices
- Payment Systems Integration & Secure Transactions
- Database Optimization & Query Performance Tuning
- Code Refactoring & Technical Debt Reduction
- API Design & Third-Party Integrations