He is afraid that he will not find a job; can he work in a riba-based bank?
Question

                I work as a teacher at different places but my position is not permanent.So when the semesters are off then neither I get any salary nor I am sure about my place to teach in the next semester.Even now I will be jobless once my semester is off.Technically I consider myself jobless.I am getting an offer from a bank.Can I join them untill I get a proper job to take care of myself and family.
Praise be to Allah.Working in banks that deal 
    with riba is haraam, because of the hadeeth of Jaabir (may Allaah be pleased 
    with him) who said: The Messenger of Allaah  (peace and blessings of 
    Allaah be upon him) cursed the one who consumes riba and the one who pays 
    it, the one who writes it down and the two who witness it, and he said: they 
    are all the same. Narrated by Muslim (2995).  
Al-Nawawi (may Allaah have 
    mercy on him) said:  
This clearly shows that it 
    is haraam to write down the contract between two who are engaging in riba, 
    and to bear witness to it, and that it is haraam to assist in falsehood. End 
    quote. 
The one who works in a 
    riba-based bank will inevitably be involved in one of these scenarios that 
    were mentioned by al-Nawawi; he will either write down or record riba, or 
    witness it, or help those who are dealing in riba in their falsehood. 
You have to fear Allaah and 
    look for permissible work; Allaah will never forsake you if you fear Him and 
    put your trust in Him. Allaah says (interpretation of the meaning): 
“And whosoever fears 
    Allaah and keeps his duty to Him, He will make a way for him to get out 
    (from every difficulty).
3. And He will provide 
    him from (sources) he never could imagine”
[al-Talaaq 65:2-3]
If you are faced with 
    hardship, then be patient, and be certain that relief will come, for 
    hardship is followed by relief, as Allaah says (interpretation of the 
    meaning): 
“Verily, along with 
    every hardship is relief,
6. Verily, along with 
    every hardship is relief”
[al-Sharh 94:5-6]
But if you reach a state of 
    necessity and you fear that you may die if you do not consume something 
    haraam, in this case Allaah has permitted you to consume enough haraam to 
    ward off harm from yourself. Allaah says (interpretation of the meaning): 
“He has explained to you 
    in detail what is forbidden to you, except under compulsion of necessity”
[al-A’naam 6:119]. 
This situation is in fact 
    unlikely to arise, because you will never be without permissible work from 
    which you can earn enough to cover the necessities. We ask Allaah to grant 
    you sufficient by means of that which He has permitted so that you will have 
    no need of that which He has forbidden. 
And Allaah knows best.