I can think of a few examples that often pose challenges for less experienced Devs, some of whom don't overcome these challenges, whether due to lack of motivat

I can think of a few examples that often pose challenges for less experienced Devs, some of whom don't overcome these challenges, whether due to lack of motivation, capacity, or any other reason: - Handle DateTime in different timezones consistently, according to the expectations of each customer and their geography. - Proper use of caching, basic search algorithms and data structures. - Thread synchronization / race condition. - Anything that requires recursion. - Database and query tunning.