Scale Engineer

Software Engineer

Software EngineerL5Hard

The Software Engineer L5 interview at Waymo is a comprehensive process designed to assess a candidate's technical expertise, problem-solving abilities, system design skills, and cultural fit within the company. Waymo, being a leader in autonomous driving technology, looks for engineers who can tackle complex challenges, design scalable and reliable systems, and collaborate effectively in a fast-paced, innovative environment.

Rounds·4

Timeline·~21d

Experience·5 - 10 yrs

Comp band·US$160000 - US$220000

Interview time·195 min

Evaluation

What they measure.

  • Problem-solving approach and analytical skills.
  • Data structures and algorithms proficiency.
  • System design and architectural thinking.
  • Coding proficiency and best practices.
  • Understanding of distributed systems principles.
  • Ability to handle ambiguity and complexity.
  • Communication and collaboration skills.
  • Adaptability and learning agility.
  • Alignment with Waymo's mission and values.

Preparation

How to prepare.

Tips

  1. Review fundamental data structures and algorithms. Practice coding problems on platforms like LeetCode, focusing on medium to hard difficulty.
  2. Deep dive into system design concepts. Study common design patterns, distributed systems principles (CAP theorem, consensus algorithms), and scalability techniques.
  3. Understand Waymo's mission and the challenges of autonomous driving. Research their technology stack and recent advancements.
  4. Prepare behavioral questions using the STAR method (Situation, Task, Action, Result). Think about examples that showcase leadership, problem-solving, and teamwork.
  5. Practice explaining complex technical concepts clearly and concisely.
  6. Familiarize yourself with common interview questions for Software Engineers at top tech companies.
  7. If applicable, brush up on machine learning, robotics, or specific domain knowledge relevant to Waymo's work.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms fundamentals. Practice 2-3 problems/day.

Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice coding these on a whiteboard or online editor. Aim for 2-3 problems per day.

Questions

Commonly asked.

  • Design a system to manage and serve personalized content to millions of users.
  • Given a large log file, find the top K most frequent IP addresses.
  • Explain the CAP theorem and its implications for distributed systems.
  • How would you design a rate limiter for an API?
  • Describe a time you disagreed with a teammate and how you resolved it.
  • Implement a function to find the kth smallest element in a sorted matrix.
  • Discuss the trade-offs between monolithic and microservices architectures.
  • How do you ensure the quality and reliability of code in a production environment?
  • What are the challenges of real-time data processing, and how would you address them?
  • Tell me about a project you are particularly proud of and your role in it.

Locations

Regional differences.

Fig · Regions — 03 locations

01 / 03

Location

Mountain View, CA

Interview focus

Deep understanding of distributed systems and fault tolerance.Experience with large-scale data processing and real-time systems.Knowledge of machine learning concepts and their application in robotics/AI.Strong emphasis on safety-critical software development practices.

Common questions

  • How would you design a system to detect and track pedestrians in real-time using sensor data?
  • Describe a challenging distributed systems problem you solved and how you approached it.
  • Discuss the trade-offs between different consensus algorithms in a distributed environment.
  • How do you ensure the safety and reliability of software in a safety-critical system like autonomous driving?
  • Explain the principles of reinforcement learning and how they might apply to autonomous vehicle control.

Tips

  • Familiarize yourself with Waymo's specific technical challenges and research areas.
  • Be prepared to discuss your experience with safety-critical systems and rigorous testing methodologies.
  • Highlight any experience with robotics, sensor fusion, or AI/ML applied to real-world problems.
  • Understand the regulatory landscape and safety standards relevant to autonomous vehicles.

Rounds

Round-by-round.

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

Hard

Data Structures And Algorithms Interview · 45 min · Software Engineer (L4-L6)

This round focuses on your fundamental computer science knowledge. You will be asked to solve 1-2 coding problems that test your understanding of data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your problem-solving approach and communication skills. Expect to discuss the time and space complexity of your solutions and consider various edge cases.

What they look for

Clean, efficient, and correct code.Clear communication of the thought process.Ability to identify and discuss time/space complexity.Proactive identification and handling of edge cases.

Evaluation

  • Correctness of the solution.
  • Efficiency (time and space complexity).
  • Code clarity and readability.
  • Ability to handle edge cases and errors.
  • Problem-solving approach.

Sample questions

  • Given a binary tree, find the lowest common ancestor of two given nodes.

    Data StructuresTreesAlgorithms

  • Implement a function to reverse a linked list in place.

    Data StructuresLinked ListsAlgorithms

  • Find the median of two sorted arrays.

    AlgorithmsArraysBinary Search

Prep for this round

  1. 01Practice coding on a whiteboard or a simple text editor.
  2. 02Focus on understanding the underlying principles of data structures and algorithms, not just memorizing solutions.
  3. 03Talk through your thought process as you code.
  4. 04Ask clarifying questions if the problem statement is unclear.
  5. 05Test your code with various inputs, including edge cases.

Common rejection reasons

  • ×Inability to articulate thought process.
  • ×Poor coding practices (e.g., no error handling, inefficient solutions).
  • ×Fundamental misunderstanding of data structures or algorithms.
  • ×Inability to optimize solutions.
  • ×Lack of attention to edge cases.

DSA

Coding questions at Waymo.

Frequently reported on Waymo loops

View all at Waymo

Other guides

More at Waymo.