The Senior Staff Software Engineer (L6) interview at Criteo is a rigorous process designed to assess deep technical expertise, architectural thinking, leadership potential, and the ability to drive complex projects. Candidates are expected to demonstrate a strong understanding of software engineering principles, system design, scalability, and problem-solving at a high level. The interview process typically involves multiple rounds, including technical assessments, system design discussions, behavioral interviews, and a final hiring manager or executive review.
Rounds·4
Timeline·~14d
Experience·8 - 15 yrs
Comp band·US$180000 - US$250000
Interview time·210 min
Evaluation
Preparation
Tips
Study plan
Fig · Study plan — 05 phases
01 / 05Phase 01 of 05
Weeks 1-2: Data Structures & Algorithms (LeetCode Medium/Hard).
Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice implementing these in your primary programming language. Solve LeetCode medium and hard problems.
Phase 02 of 05
Weeks 3-4: System Design Fundamentals & Practice.
Weeks 3-4: Dive into system design principles. Study topics like load balancing, caching, databases (SQL vs. NoSQL), message queues, microservices architecture, CAP theorem, and consistency models. Review common system design interview questions and practice designing systems like Twitter feed, URL shortener, etc.
Phase 03 of 05
Week 5: Behavioral Interview Preparation (STAR Method).
Week 5: Focus on behavioral questions. Prepare examples using the STAR method (Situation, Task, Action, Result) for common questions related to leadership, teamwork, conflict resolution, and handling failure. Reflect on your career experiences and identify key achievements and learning moments.
Phase 04 of 05
Week 6: Company Research & Domain Knowledge.
Week 6: Research Criteo's products, technology stack, and recent news. Understand the ad tech landscape and Criteo's position within it. Prepare specific questions to ask the interviewers that demonstrate your interest and understanding.
Phase 05 of 05
Week 7: Mock Interviews & Feedback.
Week 7: Mock interviews. Conduct mock interviews with peers or mentors covering both technical and behavioral aspects. Focus on receiving and incorporating feedback to refine your approach and communication.
Questions
Locations
Fig · Regions — 02 locations
01 / 02Location
Interview focus
Common questions
Tips
Location
Interview focus
Common questions
Tips
Rounds
Expand a step for evaluation criteria, sample questions, and prep notes.
Technical Coding Interview · 45 min · Software Engineer
This round typically involves a coding exercise, often on a shared online editor. The interviewer will present a problem that requires the application of data structures and algorithms. You'll be expected to write code, explain your approach, discuss time and space complexity, and consider edge cases and potential optimizations. The focus is on your ability to solve problems efficiently and write robust code.
What they look for
Evaluation
Sample questions
Given an array of integers, find the contiguous subarray with the largest sum.
Implement a function to reverse a linked list.
Find the k-th smallest element in a binary search tree.
Prep for this round
Common rejection reasons
System Design Interview · 60 min · Senior Software Engineer / Architect
This round assesses your ability to design complex, scalable, and reliable systems. You'll be given an open-ended problem (e.g., design Twitter's news feed, design a URL shortener) and expected to discuss various aspects of the system, including APIs, data models, component interactions, scalability strategies, and potential bottlenecks. The focus is on your architectural thinking and ability to make informed design choices.
What they look for
Evaluation
Sample questions
Design a system like TinyURL.
Design a distributed cache system.
Design the backend for a ride-sharing service.
Prep for this round
Common rejection reasons
Behavioral & Leadership Interview · 45 min · Hiring Manager / Senior Leader
This round focuses on your behavioral and leadership qualities. You'll be asked questions about your past experiences, focusing on how you've handled specific situations, worked in teams, led projects, and overcome challenges. The interviewer will use the STAR method (Situation, Task, Action, Result) to probe your responses and assess your fit within the team and Criteo's culture.
What they look for
Evaluation
Sample questions
Tell me about a time you had to lead a team through a difficult project.
Describe a situation where you had to influence a decision.
How do you handle constructive criticism?
Tell me about a time you failed. What did you learn?
Prep for this round
Common rejection reasons
Hiring Manager / Executive Interview · 60 min · Director of Engineering / VP of Engineering
This final round is typically with a senior leader (Director or VP) and serves as a final assessment of your overall fit, technical leadership, and strategic thinking. They will likely delve deeper into your experience, your vision for technology, and how you can contribute to Criteo's long-term goals. Be prepared to discuss your career aspirations and how they align with the company's direction.
What they look for
Evaluation
Sample questions
What is your vision for the future of ad tech engineering?
How would you influence the technical direction of a large engineering organization?
Describe a time you had to make a significant technical trade-off with long-term implications.
What are the key challenges facing Criteo's engineering teams, and how would you address them?
Prep for this round
Common rejection reasons
DSA
Frequently reported on Criteo loops
Other guides
