A job offer letter isn't a contract. It doesn't require a signature and, as you've experienced, a signature doesn't guarantee a job.Employment Offer Letter Instructions. Customer: Who should sign an offer letter first? The employer or employee? No. It's different from a formal "Contract" of employment. Those become legal and binding upon joint signatures. Learn what to include in a job offer letter and use our ready made template. Job offers are often conditional, which means they're contingent on a few additional steps, even after you've signed and accepted the position. An offer letter typically shows the general terms of employment – pay, benefits, perhaps a bonus or commission plan, and a start date.