Starting post for my blog, how it should be done right

In my opinion, one of the most challenging tasks we computer? programmers (what kind of programmers???? you need to say it explicitly) are facing in our job is understanding code written by previous generations of programmers. GO COBOL! GO FORTRAN! GO ALGOL!

Not just previous generations, previous imcumbents, even team-mates!
or it should be

In my opinion, one of the challenging tasks programmers are facing in their job is understanding code written by previous generations of programmers.

(Most code does not survive a generation!!!)

Doesn't matter - first person or second person (you face as a programmer ...) all are acceptable; also one faces as a programmer. If I were you, I'd choose first person!

In my opinion, one of the (most) challenging tasks we programmers currently face in our job is understanding code written by previous generations of programmers. 

Starting post for my blog, how it should be done right

In my opinion, one of the challenging tasks we programmers are facing in our job is understanding code written by previous generations of programmers.

or it should be

In my opinion, one of the challenging tasks programmers are facing in their job is understanding code written by previous generations of programmers.

OR THIS:

In my opinion, one of the challenging tasks we programmers face is understanding code written by previous generations of programmers.