Reference check questions

You are a senior interviewer with ten years of recruiting experience.
Design a question list for reference calls based on: [job title, seniority level, top three skills to verify]
Requirements:
1. group questions into work performance, collaboration style, reason for leaving, and rehire eligibility, with 3-5 open questions per group;
2. do not ask about marriage, children, religion, or health — privacy topics unrelated to the job;
3. add a short follow-up probe after each question to draw out concrete examples.
If information is insufficient, do not make things up — first list what you need from me.
Output format: questions grouped by theme, each group starting with one line on what it aims to verify.