This interview process is designed to assess candidates for the Software Engineer II role at ZScaler. It evaluates technical proficiency, problem-solving skills, system design capabilities, and cultural fit.
Rounds·4
Timeline·~10d
Experience·2 - 5 yrs
Comp band·US$110000 - US$150000
Interview time·210 min
Evaluation
Preparation
Tips
Study plan
Fig · Study plan — 05 phases
01 / 05Phase 01 of 05
Weeks 1-2: Data Structures & Basic Algorithms. Big O notation.
Weeks 1-2: Focus on core data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and their common operations. Practice basic algorithms like sorting (Merge Sort, Quick Sort) and searching (Binary Search). Cover time and space complexity analysis (Big O notation).
Phase 02 of 05
Weeks 3-4: Advanced Algorithms (DP, Graphs, Strings).
Weeks 3-4: Dive into more advanced algorithms such as Dynamic Programming, Graph Algorithms (BFS, DFS, Dijkstra's), and String Manipulation. Practice problems related to these topics on coding platforms.
Phase 03 of 05
Weeks 5-6: System Design Fundamentals. Databases, Caching, Load Balancing.
Weeks 5-6: Begin system design. Study concepts like API design, databases (SQL vs. NoSQL), caching strategies, load balancing, message queues, and microservices architecture. Understand trade-offs and design patterns for scalable systems.
Phase 04 of 05
Weeks 7-8: Distributed Systems, CAP Theorem, Consistency.
Weeks 7-8: Focus on distributed systems concepts, including CAP theorem, consistency models, consensus algorithms (e.g., Paxos, Raft), and fault tolerance. Practice designing complex systems and discussing trade-offs.
Phase 05 of 05
Weeks 9-10: Behavioral Questions (STAR method), Company Research, Mock Interviews.
Weeks 9-10: Prepare for behavioral questions by reflecting on past experiences and structuring answers using the STAR method. Research ZScaler's mission, values, and products. Conduct mock interviews to simulate the actual interview environment.
Questions
Locations
Fig · Regions — 02 locations
01 / 02Location
Interview focus
Common questions
Tips
Location
Interview focus
Common questions
Tips
Rounds
Expand a step for evaluation criteria, sample questions, and prep notes.
Data Structures And Algorithms Interview · 45 min · Software Engineer (Peer)
This round focuses on your fundamental programming skills. You will be asked to solve one or two coding problems, typically involving 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.
What they look for
Evaluation
Sample questions
Given an array of integers, find the contiguous subarray with the largest sum.
Implement a function to find the lowest common ancestor of two nodes in a binary tree.
Prep for this round
Common rejection reasons
System Design Interview · 60 min · Senior Software Engineer / Architect
This round assesses your ability to design scalable and robust systems. You will be presented with a high-level problem (e.g., design a URL shortener, a social media feed, or a distributed cache) and expected to propose a system architecture. The focus is on your understanding of distributed systems, databases, caching, load balancing, and trade-offs.
What they look for
Evaluation
Sample questions
Design a system to shorten URLs like bit.ly.
Design a news feed system for a social media platform.
Prep for this round
Common rejection reasons
Behavioral Interview · 45 min · Hiring Manager
This round focuses on your behavioral aspects and overall fit with the team and ZScaler. The hiring manager will ask questions about your past experiences, how you handle challenges, your career aspirations, and your understanding of teamwork. They will also assess your motivation for joining ZScaler.
What they look for
Evaluation
Sample questions
Tell me about a time you had to work with a difficult colleague.
What are your strengths and weaknesses?
Why are you interested in ZScaler?
Prep for this round
Common rejection reasons
Technical Deep Dive / Architecture · 60 min · Senior Engineer / Technical Lead
This round may involve a deeper dive into specific technical areas relevant to ZScaler's work, such as cloud security, networking, distributed systems, or specific programming languages. It could include more complex coding problems, architectural discussions, or scenario-based questions to gauge your expertise and how you'd apply it at ZScaler.
What they look for
Evaluation
Sample questions
How would you design a secure and scalable proxy service?
Explain the concept of zero-trust security and its implementation.
Describe your experience with container orchestration (e.g., Kubernetes).
Prep for this round
Common rejection reasons
DSA
Frequently reported on ZScaler loops
Other guides
