Type · Customer-Facing Experience
Describe a time you had to explain a complex technical concept to a non-technical stakeholder. What was the situation, your approach, and the outcome?
How to Pass the Duffel Solutions Architect Interview in 2026
Growth · Solutions Architect Interview Guide
Sign up to see ATSHeadquartered in United KingdomInterview language: English
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, technical depth, customer-facing experience, fit. - 2
Round 2
Technical DiscoveryDiagnosing customer technical context, integration requirements, scoping a fit. - 3
Round 3
Architecture DemoPresenting a reference architecture live, defending design choices, handling depth-of-knowledge probes. - 4
Round 4
Sales Pitch / Co-SellWorking with an AE on a mock customer call, anchoring value, navigating objections. - 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:
- Not understanding the security implications of exposing API keys client-side.
- Prioritizing short-term client satisfaction over long-term API maintainability
- Failing to ask about their definition of 'success' for this integration.
- Not articulating a clear 'win' or successful outcome.
Test Yourself: Real Duffel Questions
Three real prompts pulled from our database.
Type · Scoping Fit
A mid-sized travel agency wants to use Duffel to automate flight bookings for their corporate clients. What key questions would you ask to understand their current workflow, technical stack, and integration needs?
Type · Ownership
Tell me about a time you took ownership of a challenging technical problem that wasn't strictly within your defined role. What was the situation, what did you do, and what was the outcome?
+ many more questions, signals, and worked examples
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Duffel Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
10 of 15 questions shown
1
Recruiter Screen
3- 1
Type · Motivation
What interests you about the Solutions Architect role at Duffel, specifically within the travel industry? - 2
Type · Customer-Facing Experience
Describe a time you had to explain a complex technical concept to a non-technical stakeholder. What was the situation, your approach, and the outcome? - + 1 more questions in this round (sign up to unlock)
2
Technical Discovery
4- 3
Type · Scoping Fit
A mid-sized travel agency wants to use Duffel to automate flight bookings for their corporate clients. What key questions would you ask to understand their current workflow, technical stack, and integration needs? - 4
Type · Diagnosing Context
Imagine a customer is struggling with high latency when fetching flight data via Duffel's API. What are the potential causes you'd investigate, and how would you prioritize your investigation? - + 2 more questions in this round (sign up to unlock)
3
Architecture Demo
3- 5
Type · Reference Architecture
Present a high-level architecture for integrating Duffel's flight booking API into a typical e-commerce website, highlighting key components and data flows. Be prepared to defend your design choices. - 6
Type · Depth of Knowledge
How would you design a system to handle real-time flight availability updates and price changes for a large number of concurrent users browsing a travel site using Duffel? - + 1 more questions in this round (sign up to unlock)
4
Sales Pitch / Co-Sell
2- 7
Type · Value Anchoring
An airline is hesitant to adopt Duffel, citing concerns about disrupting their existing direct booking channels. How would you position Duffel's value proposition to address their concerns and highlight the benefits? - 8
Type · Navigating Objections
During a mock sales call, a potential customer expresses concern that integrating with Duffel will be too complex and time-consuming, potentially delaying their product launch. How do you respond?
5
Behavioral / Leadership
3- 9
Type · Ownership
Tell me about a time you took ownership of a challenging technical problem that wasn't strictly within your defined role. What was the situation, what did you do, and what was the outcome? - 10
Type · Influence
Describe a situation where you had to influence a technical decision or direction within a team or with a customer, especially when there was initial resistance. How did you approach it? - + 1 more questions in this round (sign up to unlock)
Unlock all 15 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.
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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.
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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.
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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.
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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.
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Sample answers
What a strong answer to these Duffel interview questions shows.
Describe a time you had to explain a complex technical concept to a non-technical stakeholder. What was the situation, your approach, and the outcome?
A strong answer shows: Clarity of communication.; Ability to translate technical details into business value.; Empathy for the audience's technical understanding..
A mid-sized travel agency wants to use Duffel to automate flight bookings for their corporate clients. What key questions would you ask to understand their current workflow, technical stack, and integration needs?
A strong answer shows: Probing questions about existing systems (GDS, booking tools, accounting).; Understanding of data requirements and formats.; Focus on identifying potential blockers and success criteria..
Frequently asked questions
How long does the Duffel 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 Duffel?
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 Duffel?
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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