This is the 17715th most frequent Polish word.
znalezieniu
"Znalezieniu" means "finding" or "the act of finding" in English.
In this sentence, 'znalezieniu' is used in the locative case to denote the act of finding something (a job). It is used as the complement of 'w' (in).
Pomogłem mu w znalezieniu pracy.
I helped him in finding a job.
Here, 'znalezieniu' is used in the locative case to describe the event of finding keys, functioning with 'po' (after).
Po znalezieniu kluczy mogłem otworzyć drzwi.
After finding the keys, I could open the door.
In this usage, 'znalezieniu' is related to the concept of finding and paired with 'z' (with) to express difficulty in the process.