Type · Product Strategy
How would you think about building a feature to help business travelers find the most cost-effective flight options while still meeting their travel policy requirements?
How to Pass the Duffel Product Manager Interview in 2026
The Duffel DNA (TL;DR)
Duffel's core focus on simplifying travel APIs means interviews probe for your ability to tackle complex domains like "Flights Build" and "Search Book Ancillaries Order". They assess your capacity for structured problem deconstruction and delivering robust, scalable solutions, often through detailed discussions of technical decisions.
The Duffel Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, basic fit, logistics. - 2
Round 2
Product Sense / DesignCustomer empathy, creativity, structured design thinking. - 3
Round 3
Analytical / ExecutionMetrics definition, root-cause debugging, A/B testing. - 4
Round 4
Strategy / EstimationMarket sizing, competitive positioning, business trade-offs. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Duffel interview outcomes, avoid these common traps:
- Describing a situation where they were simply doing their job.
- Not considering practical significance alongside statistical significance.
- Failing to prioritize investigation steps.
- Failing to propose concrete next steps based on the ambiguous result.
Test Yourself: Real Duffel Questions
Three real prompts pulled from our database.
Type · A/B Testing
We're considering a redesign of the flight search results page to make it more visually appealing. How would you design an A/B test to evaluate whether this redesign improves user engagement?
Type · Influence
Describe a situation where you had to persuade a skeptical colleague or stakeholder to adopt your point of view or approach. How did you do it?
+ many more questions, signals, and worked examples
Sign up to unlock the full Duffel grading rubric
Duffel Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 22 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in Duffel, and what specifically about our mission and the travel industry excites you?
2
Product Sense / Design
3- 2
Type · Product Design
Imagine Duffel wants to expand into offering ancillary services (e.g., seat selection, baggage, lounge access) directly within our flight booking flow. How would you approach designing this feature? - 3
Type · Product Improvement
Duffel currently allows users to search and book flights. What's one key area where you think we could significantly improve the user experience, and how would you measure the impact of that improvement? - + 1 more questions in this round (sign up to unlock)
3
Analytical / Execution
4- 4
Type · Metrics Definition
We've launched a new feature that allows users to save their frequent flyer numbers. What are the key metrics you would track to determine its success? - 5
Type · Root Cause Analysis
Bookings through Duffel have unexpectedly dropped by 15% this week. How would you investigate this issue? - + 2 more questions in this round (sign up to unlock)
4
Strategy / Estimation
3- 6
Type · Market Sizing
Estimate the total addressable market (TAM) for business travel booking solutions in Europe. - 7
Type · Competitive Analysis
Who are Duffel's main competitors in the flight API space, and what are their key strengths and weaknesses compared to us? - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
11- 8
Type · Conflict Resolution
Tell me about a time you had a significant disagreement with a cross-functional team member (e.g., engineer, designer, marketer) about a product decision. How did you approach it, and what was the outcome? - 9
Type · Prioritization
Describe a situation where you had too many competing priorities and limited resources. How did you decide what to focus on, and what did you do about the items you couldn't address? - + 9 more questions in this round (sign up to unlock)
Unlock all 22 Duffel 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 Duffel
How Duffel's DNA translates across functions. Pick your role.
Compare Duffel with similar employers
Same DNA, different bar. Browse the closest companies in our database and see how their loops differ.
Airbnb
Same tierAirbnb assesses how candidates build trust and belonging, mirroring their mission. Expect case studies on designing m...
See Airbnb interview questions
Exoticca
Same tierExoticca's emphasis on expanding its 'Inclusive Vacation Packages' means the loop grades for candidates who can demon...
See Exoticca interview questions
Ukio
Same tierUkio seeks adaptable, customer-centric problem-solvers who thrive in a tech-driven, flexible living market. They valu...
See Ukio interview questions
Practice Duffel interviews end-to-end
Duffel Mock Interview
Run a live mock interview with our AI interviewer using Duffel-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
Open
STAR Stories for Duffel Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Duffel interviewers grade on. Reuse them across every behavioral round.
Open
Duffel Interview Prep Hub
The frameworks behind every Duffel round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
Open
Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Duffel interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
Open
Sample answers
What a strong answer to these Duffel interview questions shows.
How would you think about building a feature to help business travelers find the most cost-effective flight options while still meeting their travel policy requirements?
A strong answer shows: Understanding of different user segments (leisure vs. business).; Ability to handle complex business rules and constraints.; Strategic thinking about market opportunities.; Focus on value proposition for a specific segment..
We're considering a redesign of the flight search results page to make it more visually appealing. How would you design an A/B test to evaluate whether this redesign improves user engagement?
A strong answer shows: Understanding of A/B testing principles.; Ability to define measurable outcomes.; Statistical thinking.; Focus on user behavior..
FAQ
Explore careers on Workfive →