The first step in NQ selection is working out the numbers we need, which depends on how busy we are. It's an obvious point but very often I've seen trainees set their heart on a quiet department. You might still get the job but only if you are considered exceptional. Try to judge that.
There can be quite a gap between your time in our department and the decision making process. Those who are freshest in our minds are definitely at an advantage.
It's also true generally that the second years know their arses from their elbows are better/more commercial/less green than the first years - just as a result of experience.
So, if you have any say about the order/choice of seat, try to organise them so that your preferred area comes later in the day.
If you want to go back to a department you saw at an early stage, make sure you keep in touch - even if it's just with the junior members of staff, it will keep you in the collective consciousness. Also, make an effort to go to social events and use them to catch up with your favourite people
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It cuts both ways: if a department keeps trying to send work your way after you have moved on, it is a good sign.
All partners in our team get to have a say in who we recruit, and we'll take a steer from the assistants too. So if you underperform for someone, go out of your way to make sure that the next piece of work you do for them is stellar, so that they won't torpedo an otherwise positive discussion about you.