Scale Engineer

Software Engineer

Software EngineerPrincipal Software EngineerHard

The Principal Software Engineer interview at Grubhub is a rigorous process designed to assess a candidate's technical expertise, leadership potential, and ability to drive complex projects. It typically involves multiple rounds covering data structures and algorithms, system design, behavioral aspects, and a deep dive into past experiences.

Rounds·4

Timeline·~14d

Experience·8 - 15 yrs

Comp band·US$180000 - US$250000

Interview time·225 min

Evaluation

What they measure.

  • Problem-solving skills
  • Algorithmic thinking
  • Data structure knowledge
  • Code quality and efficiency

Preparation

How to prepare.

Tips

  1. Review fundamental data structures and algorithms.
  2. Practice system design problems, focusing on scalability and trade-offs.
  3. Prepare to discuss your past projects in detail, highlighting your contributions and impact.
  4. Understand Grubhub's business and technology stack.
  5. Research common behavioral interview questions and prepare STAR method responses.
  6. Practice explaining complex technical concepts clearly and concisely.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures & Algorithms

Weeks 1-2: DSA fundamentals and coding practice (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 coding problems on platforms like LeetCode, focusing on medium to hard difficulty.

Questions

Commonly asked.

  • Design a URL shortening service like bit.ly.
  • How would you design a system to track user activity on Grubhub?
  • Describe a time you had to make a significant technical decision with incomplete information.
  • What are the trade-offs between SQL and NoSQL databases for a food delivery platform?
  • How do you mentor and grow other engineers on your team?
  • Explain the concept of eventual consistency and when it's appropriate to use.
  • Tell me about a time you failed. What did you learn from it?
  • Design a rate limiter for an API.
  • How would you optimize the performance of a slow database query?
  • What are your thoughts on microservices vs. monolith architectures?

Locations

Regional differences.

Fig · Regions — 03 locations

01 / 03

Location

San Francisco

Interview focus

Emphasis on large-scale system design and architectural patterns.Assessment of leadership and mentorship capabilities.Deep dive into problem-solving methodologies and impact.

Common questions

  • How would you design a distributed caching system for a high-traffic e-commerce platform?
  • Describe a time you had to mentor junior engineers. What was your approach?
  • Discuss a challenging technical problem you solved and the impact it had.

Tips

  • Be prepared to discuss trade-offs in system design choices.
  • Highlight instances where you influenced technical direction.
  • Quantify the impact of your contributions whenever possible.

Rounds

Round-by-round.

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

DSA

Coding questions at Grubhub.

Frequently reported on Grubhub loops

View all at Grubhub

Other guides

More at Grubhub.