An interview loop is the ordered set of interviews a candidate completes for one role, with each session assigned a specific competency and a named owner. It is designed before the first conversation happens, so coverage is deliberate, two interviewers never test the same thing twice, and one person holds the final decision right.
Start from the competency list, not the org chart. Write down the four or five things the role genuinely requires, such as system design, code quality, cross-team communication and ownership under ambiguity, then assign each one to exactly one session and one interviewer. That mapping is the loop. Anything not on the list does not get a slot. Anything on the list that no session covers is a hole you will only find at the debrief, when it is too late to fix. Publish the grid to everyone before the first call so each interviewer knows what they own and what to leave alone. Question wording belongs in the same document; drawing from a shared bank of [role-specific interview questions](/interview-questions) keeps two candidates comparable, which is the point of running a loop rather than a series of chats.
A panel interview is one session with several interviewers present at the same time. A loop is several sessions, usually one-on-one, arranged in a deliberate order across hours or days. The difference is not cosmetic. A panel produces one shared observation of one conversation, which is efficient and hard on nervous candidates. A loop produces independent observations that can be compared, and independence is what stops a single strong opinion spreading through the group. Most companies use both: a panel for a presentation or a stakeholder round, one-on-one sessions for competency depth. If you run a panel inside a loop, still give each panellist a distinct competency and have them score separately before they speak to each other, or you end up with one opinion recorded four times.
Cap the loop by total candidate hours, not by number of rounds. Four to five hours across the whole process is a reasonable ceiling for most roles, counting any screen and any take-home. Past that, drop-off climbs among exactly the people you want: those already employed, those with caring responsibilities, and those holding offers that move faster. If a sixth session feels necessary, the honest question is which existing session produces evidence nobody uses. Cut that one. Consolidate onsite rounds into a single day where scheduling allows, and send candidates the full agenda in advance with names and topics. Coordination drag is usually the larger cost anyway, since chasing five calendars by email loses days that [interview scheduling software](/interview-scheduling-software) recovers without anyone chasing.
Name the decision maker before the loop starts and write it down. In most companies it is the hiring manager, who reads every scorecard, runs the debrief and owns the outcome, including the outcome twelve months later. Some organisations move that right to a hiring committee, and some give an outside interviewer a veto through a bar raiser role. Any of those work. What fails is leaving it implicit, because the debrief then becomes a negotiation about who is allowed to say no, and the loudest or most senior voice wins by default. Interviewers advise; one named person decides. Record the decision, the evidence behind it and any dissent in the [applicant tracking system](/ats) so the reasoning survives after everyone has forgotten the conversation.
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