This is the 11507th most frequent Russian word.
доработать
To finalize, refine, or improve something.
The word 'доработать' here means 'to refine or finish working on something'.
Мне нужно доработать проект до конца недели.
I need to refine the project by the end of the week.
In this context, 'доработать' implies 'continuing to work for a certain period'.
Он решил доработать в компании ещё год перед выходом на пенсию.
He decided to keep working at the company for another year before retiring.
Here 'доработать' is used to indicate 'modifying or improving something that already exists'.