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接着贴后面的process
After a Facebook employee interviews a candidate, they submit their feedback via an internal tool. This includes a summary of how the candidate did and how the interview went overall, samples of their code (if appropriate) and either a "hire" or "no hire" decision. The tool also prompts you to say how confident you are in your decision on a 4-point scale ranging from "Absolutely confident" to "Not very confident". As an interviewer, once you have submitted your feedback and can no longer change it, all other feedback for the candidate becomes visible to you. This is not only interesting but can also be useful later, as I'll explain.
Once all interviewers have submitted their feedback, this data is aggregated by the recruiter. The "packet" or sets of interview reports for a candidate with good performance (I can't qualify exactly what "good" means as I don't know - it's likely a certain ratio of hire to no hire decisions) is taken to a weekly meeting of managers and top interviewers known as "candidate review". Here, each candidate is discussed individually. Everyone at the table reads the interview packet, then the candidate's performance is discussed, any possible concerns are raised and the ultimate hire/no hire decision is made based on the recommendations given in the packets and the opinions of the people around the table. In the event that a decision can't be made or agreed on, a candidate can be scheduled for a follow-up interview to try and drill down into the areas people are uncertain about and get enough data to make a decision.
Candidate review is open to any interviewer with a candidate up for review that week, which means that if you interview a candidate and think they did incredibly well, submit your feedback and then see that other interviewers thought they did poorly, you can go along to candidate review and try to convince everyone that "your" candidate is worth the company's time. Direct invites to candidate review are often extended to a candidate's interviewers for the weeks when there are contentious decisions - combinations of strong hires and strong no hires, for example, or when written feedback says they did well but the decision says "no hire" or vice versa. It's worth noting that the "packet" also contains data on decision trends and specified confidence for each specific interviewer - you can see how likely a given employee is to say "hire" or "no hire" on a global basis as well as the range of confidence in their decisions. This data can be useful when trying to understand decisions or decide how much weight to apply to certain feedback.
After the candidate review process, the final yes/no decision is made by a hiring manager and a committee of directors. This is (usually) just a formality and focuses more on details of salary and overall compensation packages. These are discussed and approved before the formal offer is made and communicated to the candidate. It's fairly rare that the hiring committee will go against the decision made in candidate review, but it can happen.
This is my understanding of what happens during the interview process at Facebook. I am a current employee and have interviewed a large number of candidates during my time here. The process is, in my opinion, as fair as it can be given the large amount of coordination required. There are obviously differences in calibration between interviewers, but every candidate is given both phone screens and a number of onsite interviews - this means that there are often 7 or 8 different interviewers involved with each candidate so the chances for errors are small. The panels which discuss candidates are themselves experienced interviewers and aware of the nuances of feedback and signals given by different interview styles and performances, as well as whether a specific interviewer has certain trends which mean their feedback might be slightly less useful than that from another. It's my opinion that the sheer number of people looking at the data makes the process very fair overall.
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