Capitalisation for job title in application letter?

[WhippetyStourie]

I am writing a letter of application for a job as a library assistant. I generally wouldn't capitalise a job title e.g. 'Give the letter to your teacher .' However, in sample letters, I notice that it seems to be the done thing to write, 'I am applying for the position of Library Officer.' I can see that in this case perhaps it's a title but what if I just want to say, ' As a library assistant, I would ...' And perhaps it's better to have consistency of style throughout. Can anyone clarify?

[PastysPrincess]

My understanding is that if it is a title it needs capital letters.

[StoorieHoose]

Yep. Job title should have capital letters