The first interview was a phone call with 2 senior developers to discuss my situation, experience, role, company profile, team, etc. All the guys quite friendly so it was a good one.
Next step was a small project/code test to complete at home in your own time. I submitted the project but the feedback was very disappointed. They were expecting a simple code without checking invalid inputs nor edge cases, so their notes included things like:
“too much error handling”,
"checking the type of args feels like overkill"
“redundant code” (for checking an invalid input, a case they did not consider),
"tradeoff between making code run in all possible situations and writing legible code is important”.
So it seems that they are interested in developers writing short and elegant code, and not in those ones that think of invalid inputs, impact, edge cases, robustness, etc.