Type · conflict resolution
Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?
How to Pass the Dept Software Engineer Interview in 2026
The Dept DNA (TL;DR)
The Transformation Brand philosophy at Dept guides interviewers to evaluate a candidate's capacity to innovate and deliver measurable impact across Media Commerce Customer Experience. They specifically assess how past work contributed to client growth and digital evolution, emphasizing strategic thinking over mere execution.
The Dept 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 Dept interview outcomes, avoid these common traps:
- Not addressing latency requirements for real-time recommendations.
- Inefficiently iterating through all possible windows for each user.
- Not testing with diverse user interaction scenarios.
- Not articulating the impact or lessons learned.
Get the full Dept 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 Dept Questions
Three real prompts pulled from our database.
Type · motivation
What interests you about working at Dept, specifically within the advertising technology space?
Type · architecture
How would you design a distributed rate limiter for an ad bidding API that needs to handle billions of requests per day while ensuring fair usage across different advertisers?
+ many more questions, signals, and worked examples
Sign up to unlock the full Dept grading rubric
Dept Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 14 questions shown
1
Recruiter Screen
1- 1
Type · motivation
What interests you about working at Dept, specifically within the advertising technology space?
2
Coding Screen
3- 2
Type · algorithmic
Given a list of user IDs and their corresponding ad impression timestamps, write a function to find users who had more than N impressions within a M-minute window. Assume timestamps are sorted. - 3
Type · algorithmic
You are given a stream of ad click events, each with a campaign ID and a timestamp. Design a data structure to efficiently retrieve the top K most frequent campaign IDs within the last hour. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · architecture
Design a system to serve personalized ad recommendations to millions of users in real-time. Consider data ingestion, user profiling, model serving, and ad selection. - 5
Type · architecture
How would you design a distributed rate limiter for an ad bidding API that needs to handle billions of requests per day while ensuring fair usage across different advertisers? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
Implement a function to find the longest common subsequence between two strings representing user search queries. Optimize for performance. - 7
Type · debugging
Here is a piece of code that calculates user engagement scores based on various interactions. There's a subtle bug causing scores to be inaccurate for users with specific interaction patterns. Find and fix it. - + 1 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. How did you take ownership to overcome it, and what was the outcome? - 9
Type · collaboration
Describe a situation where you had a technical disagreement with a colleague or manager. How did you approach the discussion, and what was the resolution? - + 2 more questions in this round (sign up to unlock)
Unlock all 14 Dept 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 Dept
How Dept's DNA translates across functions. Pick your role.
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Practice Dept interviews end-to-end
Dept Mock Interview
Run a live mock interview with our AI interviewer using Dept-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Dept Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Dept interviewers grade on. Reuse them across every behavioral round.
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Dept Interview Prep Hub
The frameworks behind every Dept 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 Dept 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 Dept interview questions shows.
Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?
A strong answer shows: Calm and objective description of the conflict.; Focus on finding a resolution rather than 'winning' the argument.; Demonstration of empathy and active listening..
What interests you about working at Dept, specifically within the advertising technology space?
A strong answer shows: Enthusiasm for Dept's work in advertising.; Understanding of Dept's business model or clients.; Articulates specific reasons for wanting to join..
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