Alex Kondratenko
Senior .NET Developer with 20+ years of practical experience
I build software that has to work reliably in the real world — desktop applications, backend systems, business automation, and modernization of existing codebases.
My main stack includes C#, .NET, WPF, ASP.NET Core, SQL, Office automation, and related technologies. I also have experience with C++, Visual Basic, Delphi, deployment tooling, installer creation, and data integration.
Over the years I have delivered custom software for a wide range of business needs, including desktop tools, automation systems, document workflows, and database-driven applications. I am strongest in projects that require careful engineering, independent execution, and long-term maintainability.
If you need a developer who can understand an existing system, improve it, and take real ownership of the result, I’d be glad to discuss your project.
Selected Projects
You can review my work history and client feedback on
What clients say
Improved the solution beyond the original specification.
Handled a complex, stop-and-start engagement smoothly, stayed available on short notice, and guided us toward a better technical implementation.
Solved complex technical problems clearly and efficiently.
Professional, experienced, and easy to communicate with — even for a non-technical client. Will definitely return for future work.
Delivered a precise API-to-Excel integration.
Worked closely with our engineer to turn multiple API endpoints into reliable Excel functions under strict requirements.
No-nonsense execution with strong ownership.
Proactive, fast to respond, flexible with billing, and focused on results despite coordination challenges.
where I work on custom software projects with a broader company presence
