I applied through a recruitment agency and it took around a month to schedule the interview but interview itself was only a day's process. The interview was divided into 3 parts mentioned below you need to pass each stage to reach the next one. 1. Logic Test - approx. 13 Questions - 1 hour - (Must Pass to progress) 2. Pair Programming Test - this will be up to a 2 hour session where the candidate is required to solve a problem using laptop/IDE and they work collaboratively with a Senior Software Engineer /Team Leader. 3. IT Head Interview - an hour interview conducted by the IT Head. The purpose of this interview is to check the candidate’s fit with Ocado and whether their behaviours are compatible with their culture and values in addition to further exploring their technical competencies beyond that which was demonstrated in the Pair Programming exercise. Unfortunately i could not clear the Logic test, I ran out of time and could not complete all the questions. Logic Test was like assembly language where they would have defined some inbuilt functions like (ZERO X : initialise the variable x with value 0, INCR X : initialise the value of the variable x with 1, ASSIGN (X,Y) : Assign the value of Y to X, X=Y, LOOP(X) : run the instructions written inside the loop for X times ) Questions are mainly on addition, subtraction, multiplication, division, finding the biggest number (out of 2 numbers) etc..using the predefined functions and also you can use the functions that has already defined in the previous questions. For example if 1st question is ADD(X,Y) and 2nd question is SUBT(X,Y) and 3rd question is MULT(X,Y), while solving the 3rd question you can use the function that was in first question that is ADD(X,Y). Try to be fast in solving the questions.

First they ask you to solve a test on a custom programming language which looks like a highly stripped down version of some very basic assembly language. If you are successful with this they do an interview with the line manager(s). You will be asked to solve a programming problem and do a whiteboard task. In the third round you meet the big boss I think he is the CTO or one of the first employees. I lost his designation.