Despite the ease of development with modern languages and frameworks, the fundamentals still manage to creep in. Just the other day I was reviewing service code

Despite the ease of development with modern languages and frameworks, the fundamentals still manage to creep in. Just the other day I was reviewing service code. Instead of letting the data store filter and sort the data with a single data call, the developer was pulling a larger data set and running an algorithm of nested for-loops to filter it in the service layer. I went straight to a Big O analysis of the code. Unfortunately, the developer had no idea what Big O notation was. AITA?