In this article
Before you start
This page compares how the interview loop differs by level.
Every source here is a secondary guide, mostly candidate-reported. Companies rarely publish their loops, so read each number as "reported", not as policy.
Why interviewers ask this
The question separates candidates who prepare for a level from candidates who prepare for a company. A senior candidate who walks into a staff loop with only coding practice is surprised by the second design round and by questions on conflict and leading without authority.
A weak answer says "staff loops are harder LeetCode". A strong answer names what changes: the round mix, what each round is graded for, and who decides the level. A Staff-level answer adds what is not known, because Google does not publish its ladder externally and principal loops have almost no public data.
Interview loops by level from first principles
- Level calibration
- Level calibration is the step in which a company decides which level a candidate's evidence supports, by comparing interview feedback with the bar for each level, so the level can differ from the one the candidate applied for.
In plain words
Think of a driving test that gets longer and wider as the license class rises. A car test checks you can drive well. A truck test also checks you can plan a route, brief a crew and handle a breakdown. The analogy breaks in one place: companies do not publish the test, so you rely on candidate reports.
In one precise sentence, the loop keeps its building blocks (coding, design, behavioral) but shifts weight from delivering a well-built system toward owning decisions that span teams.
Step 1: The round mix shifts toward design
Hello Interview's Meta E5 guide reports an onsite of traditional coding, AI-enabled coding, one design round and one behavioral round, in a process of 3 to 4 weeks. Its Meta E6 guide reports a full loop of 5 to 6 interviews including the phone screen, so an onsite of 4 to 5 rounds: coding (1 to 2), design (2), behavioral (1) and a project retrospective (0 to 1), over about 6 weeks, or 8 or more with scheduling delays.1 Meta E6 has two design rounds where E5 has one. These are candidate-built guides, not Meta publications.
| Item | Senior (E5) | Staff (E6) |
|---|---|---|
| Coding rounds | 2 | 1 to 2 |
| Design rounds | 1 | 2 |
| Behavioral rounds | 1 | 1 |
| Project retrospective | 0 | 0 to 1 |
| Design share of the onsite | 25% | 40% to 50% |
| Process length | 3 to 4 weeks | about 6 weeks, up to 8 or more |
The staff process runs 2 to 3 weeks longer than the senior one at its typical length.1 In the chart below, the Meta E5 onsite has two coding, one design and one behavioral round. The Meta E6 onsite totals 4 to 5 rounds: coding 1 to 2, design 2, behavioral 1, retrospective 0 to 1; the high bar shows one coding, two design, one behavioral and one retrospective round. You now know the round mix; the next step covers how those rounds are graded.
Text description of the diagram
- Meta E5 onsite: two coding, one design, one behavioral.
- Meta E6 onsite totals 4 to 5 rounds: coding 1 to 2, design 2, behavioral 1, retrospective 0 to 1.
The AI-enabled coding round is still a pilot: Hello Interview says Meta is currently piloting it, and interviewing.io says it was in pilot mode as of Q4 2025. See the AI-assisted coding interview for the format.
Step-by-step description
- Design rounds double at staff.
- Leadership and influence are weighed.
- Feedback is calibrated against a target level.
- Meta E6 has two design rounds where E5 has one.
- The target level is usually set before the loop, and a committee makes the hire decision at Google.
Step 2: A design round is graded for scope
At staff, a design round is graded for more than a correct system. The Hello Interview Meta E6 guide says the interview emphasizes technical leadership and influence across teams, that the design round expects you to think beyond the technical problem to organizational impact, and that the behavioral interview digs deeper into conflict resolution and leading without authority.
A staff loop adds a second design round and weighs leadership and cross-team influence. That is the line that separates the levels: a senior answer solves the problem well; a staff answer also says who else is affected, what you would decide and what you would leave to others.
Reported practice differs here. An interviewer quoted in the interviewing.io guide reportedly advises E5 candidates to practice high-level design and E6 candidates to focus on low-level questions, which sits oddly with the scope emphasis above. Prepare for both: a clear high-level structure, then depth where the interviewer pushes.
The same guide quotes an interviewer anecdote that a failed behavioral round is a no hire. That is one person's account, not company policy, but the senior guide agrees that design and behavioral carry the most weight for the level and hire decision.
Step 3: The level is calibrated, not announced
The target level is usually set before the loop, and the loop calibrates feedback against it. DesignGurus says Google "interviews you at a target level and calibrates during the loop", that levels are rarely changed after interviews, and that if you are considered at a lower level than your experience supports, you should say so before the loop is scheduled. At Google, a hiring committee that never met you reviews written feedback and makes the call, according to prepare.sh, so the committee makes the hire decision, not one interviewer. Google's own careers page on how it hires is the place to check the current format.
DesignGurus says the dedicated design round starts at L5, and lists L6 as Staff, L7 as Senior Staff and L8 as Principal.
Principal loops follow no public pattern in these sources. The unofficial testRigor table maps Principal to Google L7 to L8 and Meta E7, but none of the cited guides describes a principal loop. Prepare as for staff with examples of broader scope, and ask the recruiter for the format at any level.
Knowing it is half the job. Saying it is the other half.
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Start Free Trial →The Staff-level answer
How do interview loops change as you move from senior to staff to principal?
From what guides and candidates report, the building blocks stay the same but the weighting moves. At senior I expect coding, one design round and a behavioral round, graded on delivering a complex system well. At staff the loop usually adds a second design round, sometimes a project retrospective, and the behavioral round probes conflict and leading without authority, so I prepare stories about scope across teams. Principal formats are rarely published, so I would ask the recruiter for the format. I also confirm the target level with the recruiter before the loop is scheduled.
What makes it Staff-level is the last two sentences: it admits what is not public and treats the target level and your scope as things you confirm and state, not something the interviewer discovers.
The rubric
| Dimension | Weak answer | Strong answer | Staff answer |
|---|---|---|---|
| Correctness | "Staff is harder coding" | Names the added design round | Cites the round mix and its source |
| Depth | Lists rounds only | Explains scope grading | Separates reported practice from policy |
| Trade-offs | None | Notes company differences | Flags that levels do not map across companies |
| Communication | Rambles | States the change in order | Opens with the answer, then the caveat |
| Follow-up readiness | Surprised by "who sets level?" | Mentions calibration | Names the target level and the committee step |
Three variants of this question
How many rounds are in a staff engineer interview?
It depends on the company. Hello Interview's Meta E6 guide reports a full loop of 5 to 6 interviews including the phone screen, which is an onsite of 4 to 5 rounds; the senior onsite has 4.1 For Google, DesignGurus says the dedicated design round starts at L5, but none of the cited sources gives an interview count.
How is a principal loop different from a staff loop?
No primary source describes it. Principal is rare at Google, so public data is thin; expect more skip-level and cross-functional conversation, ask the recruiter, and do not trust a confident list from a stranger.
Do titles and levels map across companies?
Not cleanly. testRigor publishes an unofficial table that puts Principal at L7 to L8 at Google and E7 at Meta, while DesignGurus lists L7 as Senior Staff and L8 as Principal, so use such tables as a rough guide only.
Common mistakes
- "Staff loops are just harder coding." (wrong) Weight moves to design, leadership and scope. (right) "Coding stays, and a second design round and scope questions are added."
- "Every company's staff level is the same." (wrong) Ladders are unofficial and differ. (right) "I check the target level and ask the recruiter what the loop covers."
- "The interviewers decide my level." (wrong) The target level is usually set before the loop, and a committee makes the hire decision. (right) "I confirm my target level with the recruiter before the loop, and feedback is calibrated against it."
- "Behavioral is a soft round." (wrong) The senior guide ranks it among the heaviest. (right) "I prepare conflict and cross-team stories as carefully as design."
Follow-up questions
Who decides my level?
At Google, the target level is usually set before the loop, the loop calibrates feedback against it, and a hiring committee reviews written feedback and makes the hire decision. Elsewhere the exact process is not public, so confirm the target level with the recruiter before the loop is scheduled.
Does the coding round go away at staff?
No. The Meta staff guide still lists one to two coding rounds, so keep practicing; the AI-assisted coding interview page covers the newer format.
Is the behavioral round a formality?
No. The senior guide says design and behavioral carry the most weight for the level and hire decision, so build your interview skills for storytelling and for the leadership questions in the staff loop.
How long does a staff loop take?
Hello Interview's Meta E6 guide says about 6 weeks, longer with scheduling delays or a longer committee review, against 3 to 4 weeks for senior.1
Do AI labs follow the same pattern?
Do not assume it. Read the specific process, such as how the Anthropic process works and OpenAI's process and questions, and compare with the Meta engineering manager loop if you are weighing a management path.
- Staff loops keep coding, design and behavioral rounds but shift weight toward design, leadership and scope.
- Candidate-reported Meta guides list one design round at senior and two at staff, with an optional retrospective.
- The target level is usually set before the loop; at Google a hiring committee makes the hire decision.
- Level names do not map cleanly across companies, and principal loops are rarely published.
- Ask the recruiter for the format instead of trusting a confident list.
Sources
- How we hire (Google Careers) — Google Careers, 26 Oct 2026
- Meta E6 (Staff) Software Engineer Interview Guide — Hello Interview, 26 Oct 2026
- Meta E5 (Senior) Software Engineer Interview Guide — Hello Interview, 26 Oct 2026
- A Senior Engineer's Guide to Meta's Interview Process and Questions — interviewing.io, 26 Oct 2026
- Google Interview Process (2026): Rounds, Timeline and How to Prepare — prepare.sh, 26 Oct 2026
- Engineering Levels in Different Companies Compared — testRigor, 26 Oct 2026
- Google Software Engineer Levels Explained: L3 to L10 — DesignGurus, 11 Aug 2026
