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  • Poland
  • 23:09 (UTC +02:00)

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Achievement: Pair ExtraordinaireAchievement: YOLOAchievement: QuickdrawAchievement: Pull Shark

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Cadabra/README.md

Hi there 👋, I'm Sergey Olshanskiy

Senior Backend .NET Engineer · Tech Lead · Open Source Author

🧑‍💻 About me

  • 🏗️ 11+ years building scalable backend systems with .NET / C#
  • 🧩 Specialist in microservices, distributed systems, and REST APIs
  • 👨‍✈️ Led teams in fintech and real-time data processing (casino telemetry)
  • 📦 Author of DateRecurrenceR — an open source .NET date recurrence library
  • 📍 Based in Wrocław, Poland
  • 💬 Languages: Russian (native) · English (professional)

🚀 Featured Project

📅 DateRecurrenceR

No AI, just math. Efficient date recurrence library for .NET.

  • ⚡ O(1) performance — generates only the dates you need
  • 📆 Supports Daily · Weekly · Monthly · Yearly recurrences
  • 🔢 Flexible subrange generation by date range or count
  • 🕐 Uses DateOnly — no timezone headaches
  • 📦 Available on NuGet
dotnet add package DateRecurrenceR

🛠️ Tech Stack

C# .NET ASP.NET Core SQL Server Azure Docker Git

📬 Get in touch

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  1. DateRecurrenceR DateRecurrenceR Public

    Library for represents a recurrence pattern of date.

    C# 4