Type · System Design
How would you design a caching layer to speed up ad serving? What are the trade-offs involved?
How to Pass the Seed digital Software Engineer Interview in 2026
The Seed digital DNA (TL;DR)
Pasquale Gangemi and Diego Stramezzi built Seed Digital around actionable performance metrics, grading hires on how effectively they connect Web Analytics to Conversion Rate Optimization. Evaluators check if candidates name specific metric trade-offs during growth audits.
The Seed digital 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 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 Seed digital interview outcomes, avoid these common traps:
- Making assumptions about the input data without validation.
- Blaming the stakeholder without taking responsibility for communication.
- Inefficient search or matching logic (e.g., nested loops without optimization).
- Code that is difficult to read or lacks proper error handling.
Test Yourself: Real Seed digital Questions
Three real prompts pulled from our database.
Type · Algorithmic
Implement a function to calculate the Click-Through Rate (CTR) for a given ad campaign, given a list of impressions and clicks. Handle potential division by zero.
Type · Debugging
A user reports that ads are not displaying correctly for a specific segment. Here's a simplified version of the ad selection logic. Find and fix the bug.
+ many more questions, signals, and worked examples
Sign up to unlock the full Seed digital grading rubric
Seed digital Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 13 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
What interests you about working at Seed Digital, specifically within the advertising technology space, and how do you see your skills contributing to our growth?
2
Coding Screen
3- 2
Type · Algorithmic
Given a stream of ad impression events, each with a timestamp and a user ID, design an algorithm to calculate the number of unique users who saw an ad in the last hour. Assume the stream can be very large. - 3
Type · Algorithmic
You have a list of user segments and a list of ads. Each ad can be targeted to multiple segments. Write a function to find all ads that can be shown to a given user, based on the segments the user belongs to. - + 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. Consider the components involved, data flow, latency requirements, and scalability. - 5
Type · System Design
Design a system to track ad campaign performance and generate reports. What data would you collect, how would you store it, and how would you process it for reporting? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Algorithmic
Given a list of user IDs and their associated conversion events (e.g., purchase, sign-up), write a function to calculate the conversion rate for a specific campaign. Ensure your code is clean, handles edge cases, and is well-tested. - 7
Type · Debugging
A user reports that ads are not displaying correctly for a specific segment. Here's a simplified version of the ad selection logic. Find and fix the bug. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · Behavioral
Tell me about a time you had to work with a difficult stakeholder (e.g., product manager, designer) to deliver a feature. How did you manage the relationship and ensure the project's success? - 9
Type · Behavioral
Describe a challenging technical problem you faced in a past project. What steps did you take to diagnose and solve it, and what did you learn from the experience? - + 1 more questions in this round (sign up to unlock)
Unlock all 13 Seed digital 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 Seed digital
How Seed digital's DNA translates across functions. Pick your role.
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Practice Seed digital interviews end-to-end
Seed digital Mock Interview
Run a live mock interview with our AI interviewer using Seed digital-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Seed digital Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Seed digital interviewers grade on. Reuse them across every behavioral round.
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Seed digital Interview Prep Hub
The frameworks behind every Seed digital 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 Seed digital 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 Seed digital interview questions shows.
How would you design a caching layer to speed up ad serving? What are the trade-offs involved?
A strong answer shows: Caching strategies and trade-offs.; Understanding of distributed systems.; Latency optimization.; Data consistency considerations..
Implement a function to calculate the Click-Through Rate (CTR) for a given ad campaign, given a list of impressions and clicks. Handle potential division by zero.
A strong answer shows: Handling edge cases (division by zero).; Correctness of metric calculation.; Basic arithmetic and data aggregation..
Frequently asked questions
How long does the Seed digital 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 Seed digital?
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 Seed digital?
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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