Since the job description includes 70-80 hours I expect that they are paying more. It would be normal to assume a 70/40 or 80/40 pay rate, that is, about twice the normal rate for a leading edge programmer. So, base salary should probably start north of $500,000 per year. And those hours will require working both at work and at home so you should expect a fully funded home-office and half-coverage of your rent. I'm willing to bet that won't happen.