It was a multiple step interview, in which overall, everything went fine, except the last step.

They leave for the end a one to one interview with a "tech leader", which asks a lot of theory questions. That is fine, however, he asks very generic questions expecting concrete answers, and even though you might know them, your success to answer is random regardless of your years of experience.

1 "Imagine there is new data incoming into a service, how can you handle an error there and be sure that it will work before pushing into production?"

2 "How would you handle errors"

3 "What is the difference between Python and JavaScript"

4 "What is the meaning of OOP"