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Laszlo Bock

Laszlo Bock on Hiring

Former SVP of People Operations at Google

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Former SVP of People Operations at Google and author of 'Work Rules!' who transformed Google's hiring from gut-feel interviews into the most data-driven, structured hiring process in tech. Grew Google from 6,000 to over 70,000 employees while raising the hiring bar.

“The best predictor of how someone will perform in a job is a work sample test. The second best is a structured interview. The worst predictors are years of experience, GPA, and brainteaser performance.”

Work Rules! by Laszlo Bock

Laszlo Bock joined Google when it had 6,000 employees and left when it had over 70,000. In between, he did something remarkable: he took one of the most unstructured, gut-feel hiring cultures in tech and rebuilt it into the most data-driven hiring process in the world.

"Most interviews are a waste of time because the interviewer spends the first ten seconds forming an impression and then spends the rest of the interview confirming it."

His team analyzed thousands of hires, tracked their performance over years, and figured out what actually predicts success. The findings upended conventional wisdom. Brainteasers are worthless. Years of experience barely matter. GPA and school prestige are noise. What works: work sample tests, structured interviews with consistent questions and clear rubrics, and screening for four specific attributes.

"Brainteasers are a complete waste of time. They don't predict anything except the ability to solve brainteasers."

Those four attributes: general cognitive ability (the ability to learn and process new information, not IQ), emergent leadership (stepping up when needed and stepping back when not), Googleyness (intellectual humility and collaboration), and role-related knowledge. Of these, intellectual humility stood out. People who could say "I was wrong" and genuinely update their thinking outperformed those who were always certain.

"The best predictor of how someone will perform in a job is a work sample test. The second best is a structured interview."

Bock also fought to separate the interviewers from the decision-makers. A hiring committee of senior Googlers who never met the candidate reviews the interview packets and makes the final call. The hiring manager provides input but does not decide. This prevents urgency from overriding quality. The lesson is clear: structure beats intuition, every time.

Philosophy

4

Core beliefs about hiring and talent

Bock spent a decade studying what actually predicts job performance and used the data to rebuild Google's hiring process from scratch. His core finding: structured interviews with consistent questions and clear rubrics outperform unstructured interviews by a massive margin. Most of what people think makes a good interview is actually useless.

The best predictor of how someone will perform in a job is a work sample test. The second best is a structured interview. The worst predictors are years of experience, GPA, and brainteaser performance.

From 'Work Rules!' Bock's team analyzed thousands of hires and tracked their performance to determine what actually works.

Work Rules! by Laszlo Bock

Brainteasers are a complete waste of time. They don't predict anything except the ability to solve brainteasers. We stopped using them at Google because the data showed they were worthless.

Google was famous for brainteasers like 'How many golf balls fit in a school bus?' Bock killed them based on data.

Most interviews are a waste of time because the interviewer spends the first ten seconds forming an impression and then spends the rest of the interview confirming that impression. Structured interviews fix this by forcing interviewers to evaluate evidence against a rubric rather than follow their gut.

Bock's research showed that unstructured interviews are barely better than random selection.

Hire by committee, not by individual managers. No single person should have the power to make or block a hire. This removes the bias of any one interviewer and produces better outcomes.

Hiring Process

3

How they structure interviews and evaluations

Google's hiring process under Bock was built on four pillars: structured interviews, hiring committees (not individual managers), work sample tests, and a deliberate separation of the people who interview from the people who make the hiring decision. The goal was to remove as much bias and gut feel as possible.

Google's interview process uses structured interviews where every candidate for a role is asked the same questions. Each question has a clear rubric defining what a poor, average, good, and outstanding answer looks like. Interviewers score independently before the debrief.

This structure was the single biggest improvement Bock's team made to Google's hiring.

A hiring committee of senior Googlers who have never met the candidate reviews the interview packets and makes the final decision. The hiring manager provides input but does not make the call. This separation prevents urgency bias from overriding quality standards.

Google's hiring committee process was controversial internally but produced measurably better outcomes.

Google also uses work sample tests that simulate actual job tasks. For engineering roles, this means coding challenges that mirror real Google work. For other roles, it means structured case studies or project-based assessments.

Interview Questions

3

Questions they ask candidates

Bock replaced Google's famous brainteasers with structured behavioral and situational questions. Each question has a clear rubric with defined quality levels. Interviewers are trained to probe for specific evidence using consistent follow-ups, not to freestyle.

Tell me about a time you had a significant impact on a project. What was the situation, what did you do, and what was the outcome?

A structured behavioral question with a clear rubric. Interviewers probe for specifics: what exactly did this person do, versus what the team did?

Tell me about a time you had to persuade someone to change their mind. What was the situation, how did you approach it, and what happened?

Tests emergent leadership and influence without authority. Interviewers evaluate the quality of the approach and the self-awareness of the reflection.

How would you solve [specific problem related to the role]? Walk me through your approach.

Situational questions that test how candidates think through novel problems. The rubric defines what constitutes a basic, solid, and exceptional approach.

What They Look For

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Traits and signals that excite them

Google under Bock screened for four attributes: general cognitive ability (not IQ, but the ability to learn and process information), leadership (specifically 'emergent leadership,' stepping up when needed and stepping back when not), Googleyness (intellectual humility and collaboration), and role-related knowledge.

General cognitive ability: not IQ or brainteaser performance, but the ability to learn quickly, process new information, and solve novel problems. Bock found this was the strongest predictor of long-term performance.

Emergent leadership: the ability to step up and lead when the situation requires it, and equally important, to step back and follow when someone else is better positioned to lead.

Intellectual humility: people who can say 'I was wrong' and genuinely update their thinking. Bock found this trait outperformed confidence as a predictor of success at Google.

Dealbreakers

2

Warning signs that concern them

Bock found that brainteaser performance, years of experience, GPA, and school prestige were essentially useless predictors of job performance. He systematically eliminated these from Google's evaluation criteria.

Brainteaser performance, years of experience, GPA, and school prestige. Bock's data showed these were essentially useless as predictors of job performance at Google.

Candidates who are always certain, who cannot point to a time they were wrong, or who take credit for group work. These patterns predict poor collaboration and poor learning.

Signals to Watch

1

Subtle cues they pay attention to

Intellectual humility is the strongest signal Bock identified. People who can say 'I was wrong' and genuinely learn from it outperform people who are always certain. He screened for this relentlessly.

Intellectual humility. When a candidate can say 'I was wrong about this, and here's what I learned,' that is the strongest positive signal. It predicts both learning ability and collaborative effectiveness.

Frameworks

1

Mental models and structured approaches

Structured interviewing: same questions for every candidate, scored against a clear rubric, with multiple independent evaluators. This single change improved Google's hiring accuracy more than any other intervention.

Structured interviewing: ask the same questions to every candidate for a role, score answers against a predefined rubric with clear quality levels, use multiple independent evaluators, and separate the interviewers from the hiring decision-makers.

This framework is the core of what Bock built at Google and detailed in 'Work Rules!' It is the single most evidence-backed approach to hiring that exists.

Work Rules! by Laszlo Bock

Interviewer Tips

2

Practical advice for running interviews

The most impactful thing any company can do to improve hiring is to use structured interviews. Write the questions in advance, define what good and great answers look like, and train interviewers to score consistently. It costs nothing and works better than anything else.

The most impactful thing any company can do to improve hiring is to use structured interviews. Write the questions in advance, define what good and great answers look like, and train interviewers to score consistently. It costs nothing and the data shows it works better than anything else.

Stop asking brainteasers. The data is clear: they predict nothing useful. Replace them with structured behavioral questions that probe for real evidence of the traits that actually matter for the role.

Frequently Asked: Laszlo Bock on Hiring

Interview questions Laszlo Bock is known for asking candidates.

Tell me about a time you had a significant impact on a project. What was the situation, what did you do, and what was the outcome?+

A structured behavioral question with a clear rubric. Interviewers probe for specifics: what exactly did this person do, versus what the team did?

Tell me about a time you had to persuade someone to change their mind. What was the situation, how did you approach it, and what happened?+

Tests emergent leadership and influence without authority. Interviewers evaluate the quality of the approach and the self-awareness of the reflection.

How would you solve [specific problem related to the role]? Walk me through your approach.+

Situational questions that test how candidates think through novel problems. The rubric defines what constitutes a basic, solid, and exceptional approach.

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