Zillow

Software Engineer

Software EngineerP7Hard

The Zillow Software Engineer P7 interview process is designed to assess a candidate's technical expertise, problem-solving abilities, system design skills, and cultural fit within the company. It is a rigorous process that evaluates a candidate's ability to handle complex technical challenges and contribute to Zillow's innovative environment.

Rounds

4

Timeline

~14 days

Experience

8 - 15 yrs

Salary Range

US$180000 - US$250000

Total Duration

195 min

Overall Evaluation Criteria

Technical Skills

Technical proficiency in core programming languages and paradigms.
Ability to design, implement, and maintain scalable and robust software systems.
Strong analytical and problem-solving skills.
Effective communication and collaboration abilities.
Alignment with Zillow's values and culture.

System Design

System design capabilities, including scalability, reliability, and maintainability.
Understanding of architectural patterns and trade-offs.
Ability to anticipate and address potential issues in complex systems.

Behavioral and Cultural Fit

Behavioral competencies such as leadership, teamwork, and conflict resolution.
Adaptability and learning agility.
Motivation and passion for Zillow's mission.

Preparation Tips

1Thoroughly review your resume and be prepared to discuss all projects in detail.
2Practice coding problems focusing on data structures, algorithms, and problem-solving.
3Study system design principles and common architectural patterns.
4Prepare examples for behavioral questions using the STAR method (Situation, Task, Action, Result).
5Research Zillow's products, mission, and recent news.
6Understand Zillow's tech stack and relevant technologies.

Study Plan

1

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms fundamentals. Practice coding.

Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice implementing these in your preferred language. Review time and space complexity analysis.

2

System Design

Weeks 3-4: System Design principles. Practice designing systems.

Weeks 3-4: Dive into system design concepts. Study topics like scalability, availability, consistency, load balancing, caching, databases (SQL vs. NoSQL), message queues, and microservices. Practice designing common systems like a URL shortener or a social media feed.

3

Behavioral Preparation

Week 5: Behavioral preparation. STAR method. Company values.

Week 5: Prepare for behavioral interviews. Reflect on your past experiences and prepare STAR method answers for common questions related to teamwork, leadership, problem-solving, and handling challenges. Understand Zillow's company values.

4

Mock Interviews and Final Review

Week 6: Mock interviews and feedback. Final review.

Week 6: Mock interviews. Conduct mock interviews with peers or mentors to simulate the actual interview environment. Get feedback on your technical explanations, coding, and behavioral responses. Review any areas where you received feedback.

Commonly Asked Questions

Design a system to handle real-time bidding for online advertisements.
Given a large dataset of user activity, how would you identify fraudulent behavior?
Explain the trade-offs between different database technologies for a specific use case.
Describe a time you mentored a junior engineer. What was your approach?
How would you optimize the performance of a web application experiencing high latency?
What are the principles of RESTful API design?
Tell me about a challenging project you led. What were the key learnings?
How do you ensure the quality and reliability of the code you write?
Discuss your experience with distributed systems and microservices.
What are your thoughts on the future of real estate technology?

Location-Based Differences

Seattle

Interview Focus

Understanding of local market dynamics and how technology can address them.Adaptability to regional team structures and collaboration styles.Knowledge of specific regulatory or compliance aspects relevant to the location.

Common Questions

Discuss a time you had to deal with a difficult stakeholder. How did you manage the situation?

Describe a complex technical problem you solved and the impact it had.

How do you approach designing a scalable system for real-time data processing?

What are your thoughts on the current state of the real estate tech industry?

Tips

Research Zillow's presence and initiatives in the specific city/region.
Be prepared to discuss how your experience aligns with local business needs.
Highlight any experience working with distributed teams if applicable to the location.

Remote

Interview Focus

Deep dive into distributed systems and cloud technologies (AWS, Azure, GCP).Emphasis on data structures, algorithms, and their practical application.Problem-solving skills in the context of large-scale software development.

Common Questions

Tell me about a project where you had to optimize performance for a large user base.

How would you design a distributed caching system for a high-traffic website?

Describe a situation where you disagreed with a technical decision made by your team. What did you do?

What are the key challenges in building and maintaining large-scale data pipelines?

Tips

Brush up on advanced algorithms and data structures.
Prepare to discuss your experience with microservices architecture and cloud platforms.
Be ready to whiteboard complex system designs.

Process Timeline

1
Coding and Algorithms45m
2
System Design60m
3
Behavioral and Managerial45m
4
Hiring Manager / Executive Round45m

Interview Rounds

4-step process with detailed breakdown for each round

1

Coding and Algorithms

Coding challenge focused on data structures and algorithms.

Technical Interview (Coding)Medium
45 minSoftware Engineer

This round focuses on assessing your core programming skills and problem-solving abilities. You will be presented with one or two coding challenges, typically involving data structures and algorithms. The interviewer will evaluate your approach to solving the problem, the efficiency of your solution, and the quality of your code. Expect to write code on a shared editor and explain your reasoning throughout the process.

What Interviewers Look For

Strong grasp of fundamental computer science concepts.Ability to translate a problem into a working code solution.Clear communication of thought process.Attention to detail and ability to handle constraints.

Evaluation Criteria

Correctness of the solution.
Efficiency of the algorithm (time and space complexity).
Code quality, readability, and maintainability.
Problem-solving approach and ability to break down complex problems.

Questions Asked

Given an array of integers, find the contiguous subarray with the largest sum.

ArrayDynamic ProgrammingAlgorithm

Implement a function to find the k-th smallest element in a binary search tree.

TreeBinary Search TreeAlgorithm

Design a data structure that supports insertion, deletion, and getRandom in O(1) time.

Hash MapArrayData Structure

Preparation Tips

1Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert.
2Focus on understanding the underlying data structures and algorithms.
3Practice explaining your thought process out loud as you code.
4Be prepared to discuss time and space complexity.

Common Reasons for Rejection

Inability to articulate thought process clearly.
Lack of fundamental understanding of data structures and algorithms.
Poorly written or inefficient code.
Failure to consider edge cases or constraints.
2

System Design

Design a large-scale system, focusing on scalability and reliability.

System Design InterviewHard
60 minSenior Software Engineer / Architect

This round assesses your ability to design large-scale, distributed systems. You will be given an open-ended problem, such as designing a specific service or feature (e.g., a URL shortener, a social media feed, a real-time notification system). The interviewer will expect you to discuss requirements, identify components, design APIs, choose databases, consider scalability and reliability, and justify your design decisions. Whiteboarding is common in this round.

What Interviewers Look For

Ability to design complex, distributed systems.Deep understanding of system design principles.Experience with various architectural patterns.Ability to think critically about trade-offs and make informed decisions.

Evaluation Criteria

Scalability of the proposed design.
Reliability and fault tolerance.
Clarity and completeness of the design.
Understanding of trade-offs and justifications for design choices.
Knowledge of relevant technologies and patterns.

Questions Asked

Design a system like Twitter's news feed.

System DesignScalabilityDistributed Systems

Design a URL shortening service like bit.ly.

System DesignScalabilityAPI Design

How would you design a system to handle millions of concurrent users for a live streaming service?

System DesignScalabilityReal-time

Preparation Tips

1Study common system design patterns and concepts (e.g., CAP theorem, load balancing, caching strategies, database sharding).
2Practice designing various systems, focusing on scalability and availability.
3Be prepared to discuss trade-offs between different design choices.
4Familiarize yourself with technologies commonly used in distributed systems (e.g., Kafka, Redis, Cassandra, Kubernetes).

Common Reasons for Rejection

Inability to design a scalable and robust system.
Lack of understanding of distributed systems concepts.
Poorly considered trade-offs.
Failure to address potential failure points or bottlenecks.
3

Behavioral and Managerial

Behavioral questions to assess teamwork, leadership, and cultural fit.

Behavioral And Managerial InterviewMedium
45 minHiring Manager / Senior Team Member

This round focuses on your past experiences, behavioral competencies, and how you approach work and collaboration. You'll be asked questions about your career, how you handle challenges, teamwork, leadership, and your motivations. The interviewer will use the STAR method (Situation, Task, Action, Result) to probe your experiences. This is also an opportunity for you to ask questions about the team, role, and company culture.

What Interviewers Look For

Evidence of collaboration and teamwork.Ability to handle conflict and difficult situations.Demonstrated leadership and initiative.Self-awareness and a growth mindset.Enthusiasm for Zillow's mission and culture.

Evaluation Criteria

Communication skills.
Teamwork and collaboration abilities.
Leadership potential.
Problem-solving approach in non-technical contexts.
Cultural fit and alignment with Zillow's values.

Questions Asked

Tell me about a time you had to work with a difficult colleague. How did you handle it?

BehavioralTeamworkConflict Resolution

Describe a project where you took initiative or demonstrated leadership.

BehavioralLeadershipInitiative

How do you stay updated with new technologies and industry trends?

BehavioralLearningAdaptability

What are your career aspirations for the next 5 years?

BehavioralCareer Goals

Preparation Tips

1Prepare specific examples using the STAR method for common behavioral questions.
2Reflect on your strengths, weaknesses, and career goals.
3Understand Zillow's company values and how they align with your own.
4Prepare thoughtful questions to ask the interviewer.

Common Reasons for Rejection

Lack of clear communication.
Inability to provide specific examples.
Poor self-awareness.
Not demonstrating alignment with Zillow's values.
Negative attitude or lack of enthusiasm.
4

Hiring Manager / Executive Round

Discuss career goals, business understanding, and overall fit with senior leadership.

Hiring Manager / Executive InterviewMedium
45 minDirector / VP of Engineering

This final round is typically with a senior leader or hiring manager. It's a chance to discuss your overall fit with the team and company at a higher level. They will likely ask about your career goals, your understanding of Zillow's business, and how you see yourself contributing to the company's success. This is also your opportunity to ask high-level questions about the company's direction and culture.

What Interviewers Look For

Strategic thinking and business acumen.Passion for Zillow's mission.Good communication and interpersonal skills.Cultural alignment and positive attitude.Clear understanding of the role and its impact.

Evaluation Criteria

Understanding of Zillow's business and strategy.
Alignment of candidate's experience with the role's requirements.
Communication and interpersonal skills.
Motivation and enthusiasm for the role and company.
Ability to ask insightful questions.

Questions Asked

What are your thoughts on the future of the real estate technology industry and Zillow's role in it?

Business AcumenStrategyIndustry Trends

How would you approach leading a team to deliver a complex project with tight deadlines?

LeadershipProject ManagementStrategy

What motivates you to work at Zillow?

MotivationCulture Fit

Preparation Tips

1Research Zillow's business model, recent performance, and strategic initiatives.
2Think about how your skills and experience align with Zillow's goals.
3Prepare questions that demonstrate your interest in the company's vision and future.
4Be ready to articulate why you are a good fit for Zillow at a P7 level.

Common Reasons for Rejection

Lack of alignment with Zillow's strategic goals.
Inability to articulate a clear vision for the role.
Poor understanding of the business domain.
Lack of enthusiasm or engagement.

Commonly Asked DSA Questions

Frequently asked coding questions at Zillow

View all
Valid ParenthesesEASYFind First and Last Position of Element in Sorted ArrayMEDIUMNumber of IslandsMEDIUM