Type · Algorithmic
Given a stream of user ad impression events (timestamp, user_id, ad_id, advertiser_id), design a system to detect and flag fraudulent impressions in near real-time. Focus on the core logic for identifying suspicious patterns.
Growth · Software Engineer Interview Guide
Interview language: English
How to Pass the Build in Amsterdam Software Engineer Interview in 2026
The Build in Amsterdam DNA (TL;DR)
The "Build in Amsterdam We" principle guides their evaluation, seeking individuals who can transform strategic insights from "Desk Research Stakeholder Interviews" into impactful digital solutions. Candidates are graded on their capacity to deliver work that garners industry recognition, like "Webby Awards," and enhances client "Commerce Site" performance.
The Build in Amsterdam 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 Build in Amsterdam interview outcomes, avoid these common traps:
- Not considering the streaming nature of the data and proposing batch processing.
- Underestimating the latency requirements and not designing for high throughput.
- Giving a generic answer about wanting to work at a startup.
- Describing a task that was clearly part of their assigned responsibilities.
Get the full Build in Amsterdam playbook, free
Every round, the exact grading rubric interviewers score against, all the questions, and unlimited mock-interview practice. Free account, no credit card.
Test Yourself: Real Build in Amsterdam Questions
Three real prompts pulled from our database.
Type · Influence
Describe a situation where you had to convince your team or stakeholders to adopt a new technology or approach for an ad tech feature. What was your strategy, and how did you handle any resistance?
Type · System Design
Design a system to serve personalized ad recommendations to users across different platforms (web, mobile app). How would you handle user profiles, ad inventory, and the recommendation logic?
+ many more questions, signals, and worked examples
Sign up to unlock the full Build in Amsterdam grading rubric
Build in Amsterdam Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 15 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Build in Amsterdam is a fast-paced advertising technology company. What specifically about our mission and the challenges of ad tech excites you and aligns with your career goals?
2
Coding Screen
3- 2
Type · Algorithmic
Given a stream of user ad impression events (timestamp, user_id, ad_id, advertiser_id), design a system to detect and flag fraudulent impressions in near real-time. Focus on the core logic for identifying suspicious patterns. - 3
Type · Algorithmic
Implement a function that takes a list of advertiser campaigns, each with a start date, end date, and budget, and returns the total budget spent on any given day, considering overlapping campaigns. Assume a daily budget allocation. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · System Design
Design a real-time bidding (RTB) system for ad impressions. Focus on the components involved in receiving bid requests, evaluating bids, and responding within milliseconds. - 5
Type · System Design
Design a data pipeline to process and aggregate ad performance metrics (impressions, clicks, conversions) from various sources into a data warehouse for reporting. Consider data freshness and accuracy. - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
4- 6
Type · Algorithmic
Implement a rate limiter for API requests that supports different limits per user and per IP address. Ensure it's efficient and handles concurrent requests correctly. - 7
Type · Debugging
A user reports that ads are not displaying correctly on their browser, showing blank spaces instead. Here's a snippet of the ad rendering JavaScript. Debug this code and explain the potential issues. - + 2 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
4- 8
Type · Ownership
Tell me about a time you encountered a significant technical challenge in a project that was not explicitly assigned to you. How did you take ownership and what was the outcome? - 9
Type · Influence
Describe a situation where you had to convince your team or stakeholders to adopt a new technology or approach for an ad tech feature. What was your strategy, and how did you handle any resistance? - + 2 more questions in this round (sign up to unlock)
Unlock all 15 Build in Amsterdam 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 Build in Amsterdam
How Build in Amsterdam's DNA translates across functions. Pick your role.
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Practice Build in Amsterdam interviews end-to-end
Build in Amsterdam Mock Interview
Run a live mock interview with our AI interviewer using Build in Amsterdam-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Build in Amsterdam Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Build in Amsterdam interviewers grade on. Reuse them across every behavioral round.
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Build in Amsterdam Interview Prep Hub
The frameworks behind every Build in Amsterdam 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 Build in Amsterdam 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 Build in Amsterdam interview questions shows.
Given a stream of user ad impression events (timestamp, user_id, ad_id, advertiser_id), design a system to detect and flag fraudulent impressions in near real-time. Focus on the core logic for identifying suspicious patterns.
A strong answer shows: Ability to handle streaming data.; Sound logic for fraud detection heuristics.; Efficiency of the proposed algorithm..
Describe a situation where you had to convince your team or stakeholders to adopt a new technology or approach for an ad tech feature. What was your strategy, and how did you handle any resistance?
A strong answer shows: Clear articulation of benefits.; Understanding and addressing stakeholder concerns.; Effective persuasion techniques.; Successful adoption of the new approach..
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