What I Learned About C# From Job Interviews

The post says coding interviews pushed the author to use C# features that are less common in day-to-day work but useful for algorithm problems. It focuses on multidimensional arrays, tuples, binary operators, and a few string and array methods, then adds interview habits that helped in practice.

Reading notes

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• Multidimensional arrays are useful in coding exercises, especially for 2D or 3D problems such as a maze or a cube, and they are different from jagged arrays.
• Tuples are presented as a compact alternative to classes when returning small groups of values in interview code.
• Bitwise operators such as <<, >>, &, and | can help with permutation-style problems, including generating all combinations of items.
• string.Join, Array.Sort with a Comparison<T>, and Array.Copy are highlighted as practical helpers for interview problems.
• Python solutions are described as shorter and often cleaner than C# solutions for algorithm questions.
• Preparation matters, and the author recommends practicing on LeetCode, starting with easy problems, spending more time on medium ones, and reviewing other submissions.
• Most interview questions, in the author’s experience, are medium-level and often involve DFS, BFS, binary trees, or heaps.
• Before writing code, it helps to think through the solution, explain it out loud, and check whether it can be simpler or more optimal.
• Short variable and method names are recommended for interview settings.
• The post closes by saying big-company interviews also include system design and behavioral questions, and the author says he is starting a new position at Microsoft.