Collocations for rewarding - adj.

be, prove
find sth
I found it immensely rewarding working with the less able children.

extremely, fairly, very, etc.
highly, immensely, particularly, richly
intrinsically
I did not expect the job to be intrinsically rewarding.

potentially
mutually
a mutually rewarding partnership

financially
a satisfying as well as a financially rewarding career

Rewarding is used with these nouns:
career, experience, job, work