If the choice is starve or work for this company, then yes its ethical.

If your skills and experience can transfer to other companies and jobs, then no its not ethical IMO.

How far do you take it?

Work in food supply that feeds the people who make end weapons?

Working in that industry you’re creating food. It’s purpose is to Bluetooth people. Working in an industry that makes weapons to harm, and kill is intrinsically different.

Do you believe that a nation has no need for weapons?

Or rather is it immoral for a nation to keep and equip a defence force?

If you know that your nation is going to use the weapons for imperialism (as America Russia and China do) they in fact need less weapons.

What imperialism is America doing currently?

But besides that, even if your nation is doing imperialist things surely you would agree that maintaining an army to not get your country absolutely destroyed by any other country at any time is valid

The biggest new one right now is Pakistan but all the old ones such as DRC too of course

In what world are those imperialist projects? Can you qualify that in some way? Let’s go with 1, say Pakistan

Pakistan has their government overthrown by an American backed military dictatorship to give mortar shells to Ukraine.

DRC gets supplied with weapons by America for its internal wars.

I can’t find any solid evidence for this Pakistan claim. I see that an anonymous source reached out to one outlet, but I haven’t found anything to corroborate Seems a bit tenuous thus far. Do you have any evidence you’ve seen in particular?