Slightly odd at the beginning as there was no job spec(!). But a good initial phone chat with the extremely friendly hiring manager laid out the main details of the role. Next stage was a take-home test focussing on data science/table query type stuff, in SQL and then Spark. Plus a rather bizarre/contrived unix shell scripting question that took quite a while to unpick. In hindsight, should have focussed on the 3rd question, the Spark section, first as it was a single bug in the last (and hardest) part of that section that apparently lead to my rejection. Having spent around 6 hours in my spare time completing the test, it would have been nice to have received more than one small piece of feedback, but that's how companies seem to treat potential employees these days. In fact, getting any feedback at all should count as a plus, sadly. Overall probably the right result for both parties; the take-home test implied they are looking for a data query engineer whereas my background is more in mathematical algorithms, machine learning and software architecture. Oh, and when the hiring manager tells you there's no rush to finish the exercise, and the rec agent tells you there is - probably best to ignore the latter and test your results more thoroughly in the extra time you've given yourself.