Earlier quoted context omitted.
Maybe it's just me, but I tend to immediately discount any advice or proposals that suggest I work for free.
I would actually enjoy a one week type engagement to get a good fit for a company. It works both ways. You are selling your time. They are selling their environment. The problem is that the employer is accepting a lot more risk than the employee. Do you like paying for something you can't return and you can't get your money back for if it is crap? This is the situation a lot of companies are in. They hire someone, th…
How the hell does someone with a job arrange to take a week off to do this trial period for another company? Maybe it works for entry-level or the unemployed, but I don't think you'll find a lot of good senior developers who would be able to make this arrangement work. I've taken jobs entirely based on their interview process. "If I made it through that, and everyone else I'll be working with also did, I'm pumped to work with these people!" Same benefit would apply to the week long trial, but making it work logistically is difficult.