This guide discusses the principles and methodologies for conducting effective technical interviews. It outlines the objectives of interviews, emphasizing the importance of evaluating candidates based on their job-related skills, aptitudes, and cultural fit within the organization. The document highlights the need for interviews to be structured in a way that separates measurable skills from subjective assessments, thereby enhancing consistency and fairness. It details how to design scoring rubrics that facilitate objective comparisons between candidates, aiming for high inter-rater reliability among interviewers. The guide also addresses common pitfalls in interview processes, such as the risk of creating a monoculture within teams and the challenges of measuring subjective qualities. By focusing on scientific methods and clear evaluation criteria, the guide aims to help organizations improve their hiring practices and ensure that interviews are both predictive of job success and equitable for all candidates.