First: Hr phone interview, asking you about your interests in Ocado, your expectations etc. Second: Codility test. Not too difficult I have seen more difficult tests for other companies. Third: Two phone interviews, one with a software engineer, another one with a senior manager (soft skills) If you pass all of these, then you are invited onsite. First hour: logic test as described by others. Then. Pair programming test. First part is to find a solution for a problem and coding it. After that, everything becomes very hard. You have to give a solution for improving the algorithm. It's not straitghtforward at all and the interviewers bring you to sort of academic data structures which probably 0.1% of developers have used in their entire life. After your morale is so down - i really believe few people on earth would have the solution for the problem before - they start bombing you on deep and low level questions of java. Understand you have to know your things, but most of those concepts are not vital for a life of a java developer (I believe) (i.e. how many times you have to deal with garbage collector problems? That happened to me once in my 10 years experience). The last hour is a soft skill interview with a senior manager. I was not given an offer because apparently I lacked in the pair programming/tech skills side of things, which of course is the most important. Probably if you lack a bit on the codility test or on the soft skills it doesn't really matter that much. I believe the bar is set by them very high. I understand that, but I also think that if one stage matters much more than the other than would be better for them to go straight to the point, so that they don't waste their time and yours neither. Also I think it will be very hard for them to grow as they want if they don't lower a bit the bar and they maybe better-evaluating potential of candidates (what they can learn, if basis are enough to start getting the job done and increase the candidate potential by time) rather than trying to find the best developers on earth. Anyway this is only my personal opinion and I wish the best of luck to them and their business. Apart my considerations, everything was made in a very professional and friendly way from both interviewers and HR person.