Employment-At-Will Doctrine: A fundamental principle in US employment law where both employer and employee can terminate the employment relationship at any time. Important to preserve this right in documentation and avoid statements that could limit it.

Promissory Estoppel: Legal principle protecting candidates who have taken substantial actions in reliance on the job offer, such as relocating or resigning from previous employment. Could create liability if candidate suffered damages from reasonable reliance on the offer.

Contract Law Principles: Considerations regarding whether a binding contract was formed through offer and acceptance, including terms of any conditional employment agreement and stipulations in the original offer letter.

Anti-discrimination Laws: Federal protections including Title VII of the Civil Rights Act, Americans with Disabilities Act (ADA), and Age Discrimination in Employment Act (ADEA). Ensures rejection isn't based on protected characteristics.

State-Specific Employment Laws: Various state-level requirements that may affect employment relationships, including specific notice requirements and state variations of promissory estoppel regulations.