Eu trabalhei em várias áreas sendo que o último era na área de arrendamento.
I worked at several jobs/worked different jobs before...(falando de vários empregos)
I worked ten-plus years with as a Leasing Manager/Leasing Assistant/Leasing Staff, etc, with experience with leasing closure and strategies, database,...yada yada yada...
Here you can talk about different functional areas or - for instance - by industry.https://www.theguardian.com/careers/careers-blog/dealing-with-a-diverse-work-history-on-your-cv-clare-whitmell
If you are in an informal conversation at the job, you could say that you worked within the bank or finance sector, with (financing and ) leasing operations.
But leasing is a wide topic, there are several types of leasing, then without context I will leave this option, in broader terms.
I don´t expect or demand perfection of you, because I am not perfect, nobody is. Just let´s try our best to achieve the goal(s)!
"Quem sou eu pra cobrar perfeição de você, sendo que eu sou imperfeita também".
Well, this one, being an imperfect answer may (or may not) be improved further. Let´s the more advanced learners (or natives, or English speakers, etc) chime in.