Every production network is a critical one , however I consider banks to be more critical since they operate on large scale with lot of policies and offcourse huge investment . In my area you cant get a management position in a big bank or a multinational bank , they need good degrees , experience along with working knowledge of banks infrastructure and banks experience .

My point is that if you accept that IT Asst. Manager role in that bank you could open up doors for yourself into another sector but this time banks . These kinds of sector along with Oil and Gas and Pharmaceutical pays a lot .

When it comes to pen testing I could add that there are certain level of this work .

Q) Do you want to work as a consultant doing pen test for organizations ?
A) Certainly you cant do that since you will need to instruct the officers to clean up the mess and do other things , and instructing people what to work and how to work is not an easy task especially if you are dealing with disgruntled employees . This leads to a lot of frustration several times .


Q) Do you want to be a hobbyist ?
A) Yes, you can ... you can enroll for great online courses available through various organizations and test these stuff in your own network , which would off course sharpen your skills when it comes to security .

Q) If I decline this offer , would I get a pen testing job ?
A) After several companies came up with a lot of real time courses there are a bunch of young people having good knowledge in that area so the competition might be tough in your area .
NOTE: These young guys dont have good experience which is required to work on real world . They just can be good at certain points .


There can be other lot of questions you would like to ask yourself before taking a step . I cant give you a personal opinion since I dont know whats your background , years of experience , age , degrees etc.

I hope this helps