An offer letter focuses on the key details of employment. Learn what to include in a job offer letter and use our ready made template.These basic sample offer letters consist of "core" data that should be included in an offer letter. Use this letter to convey information to a new employee about whom they will report to, job title, starting date and time, rate of pay and classification. Need help drafting a job offer letter? Employment Offer Letter Instructions. Employment Offer Letter Instructions. However, if you fail to respond in. An employer can use this letter when offering at-will employment to its desired candidate in California. This is a full-time position based in South San Francisco, California.