Google Interview Questions: What to Expect and How to Prepare

Google Interview Process

Google's interview process starts with a resume screening to assess a candidate's skills, experience, and suitability. After this, candidates might face an Online Assessment (OA), which tests their coding abilities and problem-solving skills. This is typically followed by one or two phone screen interviews that dive deeper into technical knowledge and coding proficiency.

If successful in the initial stages, candidates are invited for onsite interviews, which consist of four to five rounds. These onsite rounds are known for their difficulty, often involving complex algorithm questions, system design, and sometimes a behavioral interview to gauge cultural fit and teamwork abilities. Each round is designed to challenge and evaluate different aspects of a software engineer's capabilities.

Initial Screen

Google's resume screening involves proprietary algorithms and human reviewers focusing on technical skills and past project impact. They prioritize candidates with clear quantification of achievements in past roles.

Applicants may face online assessments (OAs) testing coding skills, followed by a preliminary screening call. Around 20% progress past the initial OA to the next interview stage.

Phone Screen

Google typically conducts one or two phone screenings for software engineering positions. These initial interviews focus on coding skills and problem-solving capabilities and often involve solving algorithms or technical questions using a shared Google Doc.

The phone interview serves as a fundamental step to assess a candidate’s technical proficiency and thought process before progressing to the more comprehensive onsite interviews. It’s vital to be well-prepared in relevant programming languages and data structures.

Onsite Rounds

At Google, the onsite interview round is a crucial step. Candidates generally face four to six interviews, each lasting about 45 minutes. These sessions are typically divided into coding, system design, and a Googleyness & leadership assessment.

The coding interviews focus on data structures and algorithms, while the system design interviews assess your ability to architect scalable systems. Google emphasizes assessing problem-solving skills and cultural fit through behavioral questions during the Googleyness & leadership interview.

Final Rounds, Negotiation, Offer

After completing all interview rounds at Google, candidates often enter the team matching phase, where they discuss potential fits with various teams. Following this, successful candidates may negotiate job offers and occasionally meet with executives.

Google Technical Interview Questions and Patterns

Aspiring to ace a software engineering interview at Google requires a tactical approach to coding problem patterns. LeetCode data reveals a distinct emphasis on Dynamic Programming, Depth-First Search, and Breadth-First Search. What sets Google apart is the lesser focus on simpler coding patterns like Simulation and Two Pointers, each with only a handful of problems. This suggests that Google values candidates who can navigate complex data structures and algorithms over straightforward problem solving. Dynamic Programming and Basic DSA also hold significant weight, indicating a balanced blend of complexity and foundational knowledge in their coding interviews.

Google Interview Coding Question Difficulty

At Google, the coding interview problems are reputed for their complexity, often ranking among the toughest in the FAANG group. Commonly featured are intricate patterns centered around Graph, DP and Advanced Data Structures. While Amazon’s coding challenges might be slightly more accessible, Google’s problems generally scale towards a higher difficulty, demanding a profound understanding of complex algorithms and data structures.

Frequently Asked Google Coding Questions

Problem + Solution	Patterns	Difficulty
Logger Rate Limiter	Basic DSA	Easy
Differences Between Two Objects	Basic DSA	Medium
Delete Nodes And Return Forest	Depth-First Search	Medium
Range Module	Adv. Data Structure	Hard
Meeting Rooms III	Heap, Simulation	Hard
Finding MK Average	Adv. Data Structure, Heap	Hard
Minimum Area Rectangle	Basic DSA	Medium
The Earliest Moment When Everyone Become Friends	Adv. Data Structure, Basic DSA	Medium
Odd Even Jump	Adv. Data Structure, Dynamic Programming, Misc.	Hard
Verbal Arithmetic Puzzle	Backtracking	Hard

Sample Classical Behavioral Questions and Answers

Tell me about a time when you had to solve a particularly difficult coding problem.

• Highlight your problem-solving skills by focusing on the process you followed to identify the issue, the various solutions you evaluated, and the reasoning behind your final decision. Emphasize teamwork if collaboration was involved and conclude with the outcome of your solution.

Describe a project where you had to learn a new programming language or technology to complete it.

• Showcase your adaptability and willingness to learn. Discuss how you approached the learning process, the resources you used, and how you applied your new skills to the project. Mention any challenges you faced and how you overcame them, emphasizing the successful integration of the new technology.

Can you provide an example of a time when you improved the efficiency of a software system?

• Explain the specific inefficiencies you observed and the steps you took to address them. Discuss the technologies and methodologies you employed, the results of your improvements, and the overall impact on the project or organization. Provide quantifiable outcomes if possible to illustrate the significance of your contribution.

Sample Teamwork Behavioral Questions and Answers

Describe a time when you had to collaborate with a team that had differing opinions to achieve a project goal.

• Focus on your communication and negotiation skills. Explain how you acknowledged everyone's viewpoints, found a compromise, and how this led to a successful project outcome.

Tell me about a project where you stepped up as a leader within your team.

• Highlight your leadership style, clearly stating how you motivated the team, assigned tasks, managed deadlines, and led the project to completion.

Google emphasizes the importance of innovative thinking even in collaborative settings. Can you share an instance where your idea significantly influenced a team project?

• Discuss an idea you introduced that was outside the box, how you convinced your team to embrace it, and detail the impact it had on the project’s success.

Sample Role Specifc Behavioral Questions and Answers

Describe a project where you significantly improved the efficiency of a software system. What were the challenges, and how did the changes impact the user experience?

• Showcase personal responsibility in identifying inefficiencies, proposing solutions, and implementing changes. Highlight the outcome and overall impact on user satisfaction and system performance.

Tell me about a time when you had to learn a new programming language or technology to complete a project. How did you approach the learning curve?

• Emphasize adaptability and eagerness to acquire new skills. Discuss the strategies used to efficiently learn and apply the new technology, focusing on the successful integration into the project.

Google is known for its commitment to innovation. Can you discuss a situation where you had to think outside the box to solve an engineering problem?

• Illustrate creativity and ingenuity in problem-solving. Discuss a scenario where conventional approaches failed, requiring innovative solutions, and relate this to Google’s culture of pushing boundaries in technology.