Deliveroo Senior Software Engineer interview questions

The interview process has the next stages: * HR calls to you and you have a conversation about your background, your experience, and reasons why you are looking for a new position. * First tech interview when you receive some trivial coding problem. * Home task (3-4 hours max) * Behaviour interview * Home task review + they ask you to extend the functionality of your solution. After the last stage, I received the email with the next content: > Unfortunately due to legal reasons, I'm not able to share specific feedback from your interview. I've spent 4 hours to do my home task, took a vacation day for the last stage of the interview to hear this kind of feedback. Now I should guess what was my problem. Is it my problem? Maybe I told something wrong, maybe my English was bad, maybe the solution is not solid (but I am confident it is not a problem). Only one comes to my mind, I don't want to have a conversation with this company anymore because it is just a waste of time. It looks like they don't care about the candidates' time.

The interview was done on 2 phases, First there was an online interview with one engineer over a hangout where we pair over a code exercise. Later I was invited to a in house round of interviews and given a code task that I need it to finish in advance. The in-house interview consisted on 3 separate interviews with 2 different interviewers each. On the day of the interview I was greeted by one of the engineers doing the first interview was a paring exercise making changes on the code task. I was ask to do some modifications and explain the reasoning behind my changes. On the second interview I was ask to do a design where a system will be able cope with a sudden load. I was asked to draw on a white board a possible solution for a system that will be able to handle this The last interview was a series of question about how I behave on specific situations and was ask to give real examples if I had any. After that I was told to wait for about a week for their response, after about 4 days I got and offer from them.