I was recently given a conditional employment offer with a defense contractor. I have no clearance, so they said they'd start the process for getting me a TS/SCI soon, and that I'd be able to start work in 1-2 years (once I've gotten the clearance). They didn't say anything about working under an interim clearance, which I wasn't aware existed until after I spoke with them. I'm still waiting to hear back about whether I can work under an interim clearance.
If I'm working in an entry level intelligence analyst position in a national intelligence division, is there any reason why I wouldn't be able to start working if I can get an interim clearance?