Pre-screen assignment. Requirement: app should work without any bugs. Choice of stack; React.js/Angular/ Vue. I completed the task and didn't have any errors. However, didn't pass it due to following issues (I had received code review from Senior Engineer): - messy logic for mode options (too many if statements and mutations); - poor components separation. I wish they were more specific on their requirements. Also, the position was for junior developers and the description had understanding of React.js, So, I guess it's even better that I didn't pass as I am not sure how I would be working with people who don't even know their own requirements.