Scale Engineer

Senior Staff Software Engineer

Software EngineerL6Hard

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

What they measure.

  • Technical depth and breadth
  • System design and architectural skills
  • Problem-solving abilities
  • Leadership and mentorship capabilities
  • Communication and collaboration skills
  • Cultural fit and alignment with Criteo's values

Preparation

How to prepare.

Tips

  1. Review fundamental computer science concepts (data structures, algorithms, operating systems, databases).
  2. Deep dive into distributed systems concepts (consistency, availability, partitioning, consensus).
  3. Practice system design problems, focusing on scalability, reliability, and trade-offs.
  4. Prepare to discuss your past projects in detail, highlighting your contributions and technical challenges.
  5. Understand Criteo's business and the ad tech industry.
  6. Brush up on behavioral interview techniques (STAR method).
  7. Prepare questions to ask the interviewers about the role, team, and company.
  8. Review common coding patterns and best practices.
  9. Familiarize yourself with cloud computing concepts if relevant to the role.

Study plan

Fig · Study plan — 05 phases

01 / 05
01

Phase 01 of 05

Data Structures and Algorithms

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.

Questions

Commonly asked.

  • Describe a challenging technical problem you faced and how you solved it.
  • How would you design a system to handle millions of concurrent users?
  • Tell me about a time you disagreed with a technical decision and how you handled it.
  • What are the trade-offs between different database technologies?
  • How do you ensure the scalability and reliability of a distributed system?
  • Describe your experience with mentoring junior engineers.
  • How do you approach code reviews?
  • What are your thoughts on microservices vs. monolithic architectures?
  • How would you optimize a slow-performing API?
  • Tell me about a project you are particularly proud of and why.

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

Paris

Interview focus

Deep dive into distributed systems and large-scale architecture.Emphasis on leadership and influencing technical direction.Problem-solving for high-throughput, low-latency systems.Understanding of Criteo's specific business domain (ad tech).

Common questions

  • How would you design a real-time bidding system for an ad tech company?
  • Discuss a time you had to mentor junior engineers. What was your approach?
  • Describe a complex system you designed and the trade-offs you made.
  • How do you handle technical debt in a large codebase?
  • What are your strategies for ensuring code quality and maintainability at scale?

Tips

  • Research Criteo's technology stack and recent innovations.
  • Prepare to discuss your contributions to open-source projects if applicable.
  • Be ready to articulate your thought process clearly and concisely.
  • Understand the challenges specific to the ad tech industry.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

DSA

Coding questions at Criteo.

Frequently reported on Criteo loops

View all at Criteo

Other guides

More at Criteo.