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      Guardant Health

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      Sr. Software Engineer Interview

      Jan 20, 2022
      Anonymous employee
      Redwood City, CA
      Accepted offer
      Positive experience
      Average interview

      Application

      I interviewed at Guardant Health (Redwood City, CA) in Apr 2018

      Interview

      Start with a recruiting manager followed by 4/5 engineers, SQA, and product manager depending on the type and level of the position. Usually these days due to covid it is Zoom friendly interview.

      Interview questions [1]

      Question 1

      General technical and experience in the health care industry.
      Answer question

      Other Sr. Software Engineer interview reviews for Guardant Health

      Senior Software Engineer Interview

      Aug 25, 2025
      Anonymous interview candidate
      No offer
      Negative experience
      Average interview

      Application

      I applied online. The process took 1 week. I interviewed at Guardant Health in Aug 2025

      Interview

      There were supposed to be 5 rounds in total, each of 45 minutes. However, sometimes they merge the last 4 rounds into one if a panel is available. In my case, only 4 rounds happened. Before the interviews, I was given a simple assessment of about 30 minutes. It had one basic DSA question along with multiple-choice questions on JavaScript, React, and Angular. The recruiter told me that out of 5 rounds, at least 3 need to be positive. Based on the interviewers’ responses, I felt out of 4 Rounds, Round 1, Round 3, and Round 4 went well for me. After the 4th interview, the recruiter completely ghosted me. The 5th round never happened, and they stopped responding to calls or emails. Very unprofessional. Round 1 Introduction Difference between runtime vs compile-time polymorphism (with code) What does String pool ment in java Basic React questions: Virtual DOM, useState, useEffect, hooks, etc. 👉 This round went really well. Round 2 (didn’t go well) Design a function to generate OTP. The interviewer wanted me to include userId in the 6-digit numeric OTP, which makes it predictable. I told the same to him but probably he didn't liked it. Platform vs Framework – I wasn’t fully aware of the “platform” term, so I mentioned Windows, Node.js, etc. How to update existing React pages when almost everything (UI and code) is changing – I explained from my real experience: update common components first, then page by page, and optionally create a temp URL for testing before production. (This was the correct approach.) Round 3 Coding: Return all subarrays from an array having sum equal to K (solved in 10 mins). Java Streams: concept of lazy loading in streams (I wasn’t aware). React theory questions. (hooks, life cycle states, etc...) 👉 Overall, a good round. Round 4 Coding: Implement Math.pow(x, y). He expected 30–40 mins, I did it in 10–15 mins As he was expecting I will take 40 mins minimum, the interviewer didn’t seem to have more questions, so he gave vague requirements, which I fulfilled. Some React and frontend questions: cross-browser compatibility, interceptors in UI/backend, how to transfer Redux state to another tab (I didn’t know this, as it’s a rare case). 👉 This also went well. Final Thoughts: Out of 4 rounds, 3 went well, and as per the recruiter, that should have been enough. But after that, they ghosted me. The 5th round never happened, and they didn’t even bother to update me or answer calls. Very unprofessional experience.

      Interview questions [1]

      Question 1

      Assessment (30 mins) 1 basic DSA question MCQs on JavaScript, React, and Angular Round 1 Tell me about yourself / Introduction What is runtime polymorphism vs compile-time polymorphism? Write code for it. React basics: What is the Virtual DOM? What is useState? What is useEffect? General questions about hooks Round 2 Design a function to generate an OTP (interviewer wanted userId included in OTP). Difference between Platform vs Framework. How would you update existing React pages if almost everything (code + UI) is changing? Round 3 Coding: Return all subarrays from an array whose sum equals K. What does lazy loading in Java Streams mean? React theory questions (not specified, but general discussion). Round 4 Coding: Implement Math.pow(x, y). How do you maintain cross-browser compatibility? What are interceptors in UI and backend? How would you transfer the entire Redux state to another tab?
      Answer question

      Senior Software Engineer Interview

      Mar 12, 2022
      Anonymous employee
      San Jose, CA
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied online. The process took 3 weeks. I interviewed at Guardant Health (San Jose, CA) in Feb 2022

      Interview

      The online test seems to be given lot of weight age. The interview panel was very reasonable and welcoming and the process was very pleasant. Overall a thorough but reasonable process.

      Interview questions [1]

      Question 1

      What is the hardest problem I ever solved?
      Answer question
      1