The interviewer briefly introduced himself in terms of when he has joined the company and what project he has (lately) worked on.
Then I was required to solve a coding task.
I'd say the task was rather simple, and what the interviewer was looking for was:
-- ability to quickly grasp the task at hand
-- ability to quickly come up with idea how to (efficiently enough) solve it
-- ability to quickly and correctly turn your idea into working code.
Suggestion: once you're done coding -- go through your code, check how it will handle the corner cases, reason out loud about what you're doing. Don't panic :)
Than, at the end you are given the opportunity to ask questions.
As you can expect, they'd like to see you show genuine interest in how things are done there, so showing some excitement helps a lot.