Type · ownership
Describe a time you identified a performance bottleneck in a user-facing travel flow that was not assigned to you. How did you prioritize fixing it against your existing sprint commitments?
How to Pass the Zerolook Software Engineer Interview in 2026
The Zerolook DNA (TL;DR)
Simone Lini's leadership at Zerolook prioritizes optimizing The Flight Shopping algorithms. Candidates are graded on their ability to minimize latency during Metasearch Comparison queries while maximizing Additional GTV.
The Zerolook Interview Loop
Your onsite loop will typically consist of 4 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard problems, reasoning about defects, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Zerolook interview outcomes, avoid these common traps:
- Using a global counter that never expires
- Jumping to 'it's a database error' without verifying logs first
- Focusing only on the travel product rather than the engineering challenges
- Failing to address how to handle bursts of legitimate traffic
Test Yourself: Real Zerolook Questions
Three real prompts pulled from our database.
Type · scalability
How would you design a rate-limiting service for our travel search API to prevent scraping while allowing legitimate high-volume partners to access data?
Type · data-structure
Design a cache mechanism for flight price lookups that evicts the least recently accessed items, but prioritizes keeping items that have been accessed more than three times.
+ many more questions, signals, and worked examples
Sign up to unlock the full Zerolook grading rubric
Zerolook Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
8 of 11 questions shown
1
Recruiter Screen
1- 1
Type · motivation
What specific technical challenges in the travel booking domain draw you to Zerolook compared to other platforms in the growth space?
2
Coding Screen
1- 2
Type · data-structure
Design a cache mechanism for flight price lookups that evicts the least recently accessed items, but prioritizes keeping items that have been accessed more than three times.
3
System Design
3- 3
Type · architecture
Design a system to handle high-frequency price updates for millions of travel listings while ensuring users see consistent pricing during the checkout process. - 4
Type · scalability
How would you design a rate-limiting service for our travel search API to prevent scraping while allowing legitimate high-volume partners to access data? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 5
Type · debugging
We have a bug where users occasionally receive stale itinerary data after a booking confirmation. How would you instrument and debug this in a distributed environment? - 6
Type · data-structure
Implement a data structure for a travel recommendation engine that keeps track of the 'trending' destinations based on a sliding window of the last 60 minutes of searches. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 7
Type · ownership
Describe a time you identified a performance bottleneck in a user-facing travel flow that was not assigned to you. How did you prioritize fixing it against your existing sprint commitments? - 8
Type · conflict
Walk me through a situation where you had to push back on a feature launch because the system's reliability under peak travel season load was at risk, despite pressure from leadership to ship. - + 1 more questions in this round (sign up to unlock)
Unlock all 11 Zerolook questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at Zerolook
How Zerolook's DNA translates across functions. Pick your role.
Compare Zerolook with similar employers
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Practice Zerolook interviews end-to-end
Zerolook Mock Interview
Run a live mock interview with our AI interviewer using Zerolook-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Zerolook Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Zerolook interviewers grade on. Reuse them across every behavioral round.
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Zerolook Interview Prep Hub
The frameworks behind every Zerolook round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
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Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Zerolook interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
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Sample answers
What a strong answer to these Zerolook interview questions shows.
Describe a time you identified a performance bottleneck in a user-facing travel flow that was not assigned to you. How did you prioritize fixing it against your existing sprint commitments?
A strong answer shows: Proactive problem identification; Effective communication with stakeholders.
How would you design a rate-limiting service for our travel search API to prevent scraping while allowing legitimate high-volume partners to access data?
A strong answer shows: Knowledge of distributed rate limiting techniques; Understanding of API traffic patterns.
Frequently asked questions
How long does the Zerolook interview process take?
Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.
How should I prepare specifically for Zerolook?
Focus on three things: (1) the company DNA shown above - what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.
Does this apply to engineering or design roles at Zerolook?
The DNA stays the same - what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.
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