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I'm Thomas Ngo, a software engineer in Stanton, California. I write down what I learn about algorithms, C# and .NET, and building real software, so I understand it better and you can learn it faster.

Articles explain a topic end to end. Problem of the Day posts are my daily algorithm practice, one LeetCode problem at a time.

1029 posts since 2023 624 Problem of the Day write-ups 272 tags

Latest articles

Guides and deep dives on .NET, architecture and the tools I use at work.

  1. User Impersonation for QA & Dev in Windows Auth with ASP.NET Core MVC (.NET 10)

    8 min

    Learn how to build a safe, production-grade user impersonation mechanism in ASP.NET Core MVC (.NET 10) to streamline QA and local development for Windows Authenticatio...

    ASP.NET CoreMVCWindows Authentication.NET 10

  2. A Simple Guide to the Decorator Pattern: User Impersonation in ASP.NET Core MVC (.NET 10)

    5 min

    Design patterns often feel intimidating when buried under enterprise boilerplate or third-party libraries. However, the Decorator Pattern is simple, elegant, and can b...

    .NET.NET 10C#C# 14

  3. How to Create a Custom .NET 10 MVC & API Solution Template

    40 min

    When starting a new project or onboarding team members, setting up the same repetitive multi-project architecture by hand (creating a modern solution file, adding an M...

    .NET.NET 10C#ASP.NET Core

  4. Windows Task Scheduler

    1 min

    Sometimes, we need to run daily task or schedule a process to run on a window server. This can be tedious and time consuming. So, it’s better to find a way to automate...

    Task Scheduler

  5. Select and SelectMany in C# LINQ with .NET 10

    7 min

    Select and SelectMany are two of the most useful LINQ operators. Both transform data, but they produce different shapes:

    .NETC#LINQ.NET 10

  6. Understanding GroupBy, ToLookup, and Join in LINQ with C# and .NET 10

    9 min

    LINQ gives C# developers a concise way to filter, transform, group, and combine data. Three operators that often look similar but solve different problems are GroupBy,...

    .NETC#LINQ.NET 10
See every post in the Journal

Problem of the Day

Daily algorithm practice, one LeetCode problem at a time, with the approach and complexity.

  1. Copy List with Random Pointer in C#
  2. Remove N-th Node From End of List in C#
  3. LeetCode: Reorder List in C#
  4. Median of Two Sorted Arrays in C#
  5. Linked List Cycle Detection in C#
  6. Merging Two Sorted Lists in C#
  7. Reverse Linked List in C#
  8. Time Based Key-Value Store in C#
  9. Search in Rotated Sorted Array in C#
  10. Find Minimum in Rotated Sorted Array in C#
See all 624 problems

Topics

The tags I write about most, with how many posts each has.

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About

Who's writing this.

I'm Thomas Ngo, a software engineer in Stanton, California. I build reliable, maintainable software and write down what I learn along the way.