Scotiabank Senior Software Engineer interview questions

for assignment 3 questions were there. 1 was algo and that was to get familiar with codility. 2nd was to display a table in react function component by fetching data from a endpoint. 3rd was to make counter in class component. I was given 80 min for these. In the technical interview, 1st question was a algo using a array manupulation 2nd was to make a todoapp and 3rd was to make a rest api using node which returns a json in a simple format.

What's the most challenging thing you had ever faced?