I sent an email, including my CV and soon got a reply which had 3 tasks to complete. One was a general question, and the other two were coding tasks.

They prefer email screening rather than phone or Skype talks. I don't like coding a lot on interview exercises, before I have the slightest idea that they are interested in me. Anyway I did the coding task, but I didn't write any tests for my code, and I think the main reason I got rejected was that.

What project are you proud of?

Write some code to flatten an array.

We have a list of customers with their geographical coordinates in a JSON formatted text file, and you need to find the closest 100 customers to our office.