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Zip Interview Process & Rounds

Zip (ZipHQ) is a procurement-automation startup, and its loop is front-loaded on the phone screen: more of the reported rejections come there than at the onsite. There are often TWO phone screens rather than one: a LeetCode-style round, then a separate practical-coding round where you are dropped into an existing multi-file repository and asked to fill in business logic and write its unit tests. In other loops the practical round sits in the virtual onsite instead. One candidate's invitation specified the practical round in Java, while another asked the recruiter for Python and got it, so ask which language before you prepare. Some candidates are sent a 90-minute online assessment built as four gated levels, where each level's tests must fully pass before the next unlocks. The reported themes were a simplified in-memory database and an object-oriented cloud storage system, and two candidates who cleared three of the four levels were still rejected. The virtual onsite adds an algorithmic coding round and a project deep dive. Some loops also add a system design round, which one senior candidate describes as consistency between two microservices. One director asked for at least three projects prepared. Most reports describe the interviewers as friendly, and several record hints when a candidate stalls, but a hint did not rescue the round in two of those reports. The binding constraint is time more than difficulty.

Part of the full catalog of Zip interview questions, covering every round.

Key facts

  • •5 distinct round types
  • •14 questions reconstructed from 41 candidate reports
  • •Reports span Feb 2025 – Jul 2026
  • •Refreshed monthly · last updated October 2026

The Zip loop, from candidate reports

Zip (ZipHQ) is a procurement-automation startup, and its loop is front-loaded on the phone screen: more of the reported rejections come there than at the onsite. There are often TWO phone screens rather than one: a LeetCode-style round, then a separate practical-coding round where you are dropped into an existing multi-file repository and asked to fill in business logic and write its unit tests. In other loops the practical round sits in the virtual onsite instead. One candidate's invitation specified the practical round in Java, while another asked the recruiter for Python and got it, so ask which language before you prepare. Some candidates are sent a 90-minute online assessment built as four gated levels, where each level's tests must fully pass before the next unlocks. The reported themes were a simplified in-memory database and an object-oriented cloud storage system, and two candidates who cleared three of the four levels were still rejected. The virtual onsite adds an algorithmic coding round and a project deep dive. Some loops also add a system design round, which one senior candidate describes as consistency between two microservices. One director asked for at least three projects prepared. Most reports describe the interviewers as friendly, and several record hints when a candidate stalls, but a hint did not rescue the round in two of those reports. The binding constraint is time more than difficulty.

What does Zip ask in each round?

Zip interviews span 5distinct round types, shown below. Counts reflect distinct questions per round across the loops we’ve indexed.

An algorithmic round — House Robber III on a general tree and card-meld enumeration are both reported here — and in some loops the practical repository round sits here instead of at the phone screen.
5 questions
Most-reported: Question/Answer/Condition Matcher (AST Composition Pattern) (6 reports)
Often two: a LeetCode-style round in staged parts, plus a practical-coding round inside an existing repository.
5 questions
Most-reported: Furthest Building You Can Reach (Heap-based / LeetCode 1642) (4 reports)
Reported twice: consistency between an order service and an inventory service on a senior loop, and an ML document-search platform. One mid-level candidate reports no design round.
2 questions
Most-reported: Document Search Platform with Personalization (1 report)
A project deep dive plus standard motivation questions. One director kept it high level and asked for three projects; another hiring manager spent forty minutes probing one project in detail.
1 question
Most-reported: Project Deep Dive and Behavioral (4 reports)
90 minutes, four gated levels, each unlocking only when its tests fully pass.
1 question
Most-reported: Cloud Storage System OOD Design (1 report)
What passing candidates do
  • •Asking how many follow-ups a problem has before starting. One report says this explicitly — the coding rounds are staged, and budgeting for the later parts is the difference between finishing and stalling.
  • •Reading the repository's structure first in the practical round rather than starting to type. Reports say working out what each file and class does, and finding where the change belongs, takes real time; one puts reading the requirements alone at ten minutes.
  • •Clarifying the scenario before designing. In the ML system-design report the interviewer gave very specific context up front, and the candidate's advice is to raise anything unclear before starting the design.
  • •Explaining your reasoning continuously. One candidate misread the problem, was corrected by the interviewer, pivoted, and still passed — the recovery was visible.
  • •Preparing at least three projects for the director deep dive, with size, duration, impact and your role for each; that report says only one needs full technical detail. Do not count on it staying shallow — another hiring-manager deep dive spent forty minutes probing one project.
Where candidates lose points
  • •Running out of time across staged parts. One report finished part 1 slowly because of its follow-ups, got half of part 2 written, and was rejected the next day — concluding both parts must run clean.
  • •Losing time to a small bug. One onsite candidate had the right approach, got stuck on a silly bug for over ten minutes, and suspects that is why they were rejected; another's feedback named debugging by rerunning the code again and again instead of reasoning about it.
  • •Misreading the prompt at the start. One candidate burned fifteen to twenty minutes before the interviewer pointed out the error; they recovered and passed, getting every test passing only at the 45-minute mark.
  • •Treating the practical round as a reading exercise. The task is to implement AND test; one candidate did not get the implementation written and heard nothing back.
  • •Treating three of the four OA levels as enough. One candidate was told three would advance them, left four tests failing on the fourth, and was rejected; another scored 750 out of 1000 and was rejected.

FAQ

How many rounds is the Zip interview?▾
Zip's loop spans 5 round types: An algorithmic round — House Robber III on a general tree and card-meld enumeration are both reported here — and in some loops the practical repository round sits here instead of at the phone screen., Often two: a LeetCode-style round in staged parts, plus a practical-coding round inside an existing repository., Reported twice: consistency between an order service and an inventory service on a senior loop, and an ML document-search platform. One mid-level candidate reports no design round., A project deep dive plus standard motivation questions. One director kept it high level and asked for three projects; another hiring manager spent forty minutes probing one project in detail., 90 minutes, four gated levels, each unlocking only when its tests fully pass..
What is the Zip interview process?▾
Zip (ZipHQ) is a procurement-automation startup, and its loop is front-loaded on the phone screen: more of the reported rejections come there than at the onsite. There are often TWO phone screens rather than one: a LeetCode-style round, then a separate practical-coding round where you are dropped into an existing multi-file repository and asked to fill in business logic and write its unit tests. In other loops the practical round sits in the virtual onsite instead. One candidate's invitation specified the practical round in Java, while another asked the recruiter for Python and got it, so ask which language before you prepare. Some candidates are sent a 90-minute online assessment built as four gated levels, where each level's tests must fully pass before the next unlocks. The reported themes were a simplified in-memory database and an object-oriented cloud storage system, and two candidates who cleared three of the four levels were still rejected. The virtual onsite adds an algorithmic coding round and a project deep dive. Some loops also add a system design round, which one senior candidate describes as consistency between two microservices. One director asked for at least three projects prepared. Most reports describe the interviewers as friendly, and several record hints when a candidate stalls, but a hint did not rescue the round in two of those reports. The binding constraint is time more than difficulty.
How fresh is this Zip interview data?▾
It's reconstructed from candidate reports spanning Feb 2025 – Jul 2026 and refreshed monthly as new reports come in.

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