Recruitment process starts with a 90min Codility test. This test has 3 problems to solve. The first one can be solved with a simple quicksort algorithm for arrays that's already implemented in Java. After this they scheduled a day to come over to their offices. This day begins with 2 written tests of 45min each. The first test is about general programming logic. They'll give you 4 basic operations (set to zero, increment, loop, copy value from one variable to another) and will ask you to build new functions. Don't forget you can use all of the functions you've already built to answer the questions. The last question will ask you what a piece of code does and in my case was to find out wether a number was prime or not. The second test is about Java and they'll ask you to implement a simple linked list. There's one question about recursion. No matter how the tests go, Ocado will provide lunch for you. After that they'll let you know wether or not you've passed the tests. If you did pass the tests you'll get to see their warehouses and you'll have 2 interviews in the afternoon. The first interview will be very technical and 3 of Ocado's software engineers will ask you multiple questions about SQL and Java. They may ask you to write a small method on a white board. The second interview is more of a chat about you and your expectations.