I suggest you contact HR and let them know you have not received an offer letter and uncomfortable moving forward without one. State agencies are required to adhere to the following filing requirements when accepting applications for state civil service examinations and job vacancies.An exploding offer is when a company gives you a teeny tiny window to make a decision of whether or not to take a job offer. Generally it's 24 hours or less. I accepted a job offer through an email but I have not yet signed the contract. Is it possible to back out of the job. There is no involuntary servitude in California. You may back out of your contract and no one can enforce your performance. As an employer you are not required to grant an extension of time when offering a candidate a job. You can use the acceptance letter to confirm in writing the details of your employment and clear up misunderstandings before they have a chance to develop.