Type · API Design
Design an API for Voodoo's ad server to serve personalized ad creatives to millions of users in real-time. Consider latency, throughput, and fault tolerance.
How to Pass the Voodoo Software Engineer Interview in 2026
The Voodoo DNA (TL;DR)
Voodoo's interview loop often probes for a candidate's ability to drive growth in ambiguous environments, particularly how they'd leverage data from platforms like Figtree to identify new market opportunities or optimize existing product performance. They look for practical application of insights over theoretical knowledge.
The Voodoo Interview Loop
Your onsite loop will typically consist of 5 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, debugging, 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 Voodoo interview outcomes, avoid these common traps:
- Not demonstrating empathy or understanding of the other party's viewpoint.
- Focusing only on compensation or benefits without mentioning genuine interest in the company's mission or products.
- Not explaining how they actively worked towards a resolution.
- Focusing on superficial errors instead of the root cause of the intermittent failure.
Test Yourself: Real Voodoo Questions
Three real prompts pulled from our database.
Type · Collaboration
Tell me about a time you had a significant technical disagreement with a colleague or another team. How did you approach the situation, and what was the outcome?
Type · Edge Cases
Write a function to calculate the click-through rate (CTR) for a given campaign. Consider edge cases like zero impressions, zero clicks, and campaigns with no associated data.
+ many more questions, signals, and worked examples
Sign up to unlock the full Voodoo grading rubric
Voodoo 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
What interests you about working at Voodoo, specifically within our media and growth teams?
2
Coding Screen
3- 2
Type · Data Structures
Given a list of user engagement events (timestamp, user_id, event_type), write a function to find the top K most frequent event types within a given time window. - 3
Type · Algorithms
Design an algorithm to detect if a user has viewed a specific ad creative more than N times in the last M minutes, given a stream of ad impression events. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · API Design
Design an API for Voodoo's ad server to serve personalized ad creatives to millions of users in real-time. Consider latency, throughput, and fault tolerance. - 5
Type · Data Pipeline
Design a data pipeline to collect, process, and store user interaction data (impressions, clicks, conversions) from Voodoo's mobile apps and websites for A/B testing and analytics. - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
4- 6
Type · Algorithms
Implement a function to find the longest common subsequence between two strings representing user session IDs. This could be used for analyzing user journey similarities. - 7
Type · Debugging
A critical user registration flow is intermittently failing in production. Here's a simplified code snippet. Identify the potential bug, explain why it occurs, and provide a corrected version. - + 2 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 handle it, and what was the outcome? - 9
Type · Collaboration
Tell me about a time you had a significant technical disagreement with a colleague or another team. How did you approach the situation, and what was the outcome? - + 9 more questions in this round (sign up to unlock)
Unlock all 22 Voodoo 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 Voodoo
How Voodoo's DNA translates across functions. Pick your role.
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Practice Voodoo interviews end-to-end
Voodoo Mock Interview
Run a live mock interview with our AI interviewer using Voodoo-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Voodoo Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Voodoo interviewers grade on. Reuse them across every behavioral round.
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Voodoo Interview Prep Hub
The frameworks behind every Voodoo 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 Voodoo 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 Voodoo interview questions shows.
Design an API for Voodoo's ad server to serve personalized ad creatives to millions of users in real-time. Consider latency, throughput, and fault tolerance.
A strong answer shows: Understanding of distributed systems principles.; Experience with API design and scalability.; Consideration of performance metrics (latency, throughput)..
Tell me about a time you had a significant technical disagreement with a colleague or another team. How did you approach the situation, and what was the outcome?
A strong answer shows: Effective communication and conflict resolution skills.; Ability to collaborate and compromise.; Focus on team goals over individual preferences..
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