The Software Engineer SDE IV interview at InMobi is a rigorous process designed to assess a candidate's technical expertise, problem-solving abilities, system design skills, and cultural fit. It typically involves multiple rounds, including technical interviews, a system design round, and a behavioral/managerial round. The goal is to identify candidates who can not only solve complex technical challenges but also contribute to the company's growth and collaborative environment.
Rounds·3
Timeline·~7d
Experience·6 - 10 yrs
Comp band·US$150000 - US$200000
Interview time·165 min
Evaluation
What they measure.
Problem-solving skills
Algorithmic thinking
Data structure knowledge
Code quality and efficiency
System design principles
Scalability and performance considerations
Trade-off analysis
Understanding of distributed systems
Communication skills
Teamwork and collaboration
Leadership potential
Adaptability and learning agility
Alignment with InMobi's values
Preparation
How to prepare.
Tips
01Brush up on fundamental data structures and algorithms (arrays, linked lists, trees, graphs, hash maps, sorting, searching).
02Practice coding problems on platforms like LeetCode, HackerRank, focusing on medium to hard difficulty.
03Review system design concepts: load balancing, caching, databases (SQL/NoSQL), message queues, microservices, CAP theorem.
04Understand distributed systems concepts: consistency, availability, partitioning.
05Prepare to discuss your past projects in detail, focusing on your contributions and technical challenges.
06Research InMobi's business, products, and technology stack.
07Practice behavioral questions using the STAR method (Situation, Task, Action, Result).
08Be ready to articulate your thought process 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 & Practice (2-3 problems/day).
Weeks 1-2: Focus on core Data Structures and Algorithms. Cover arrays, linked lists, stacks, queues, trees (binary, BST, AVL), heaps, hash tables, graphs. Practice problems related to searching, sorting, recursion, dynamic programming. Aim for 2-3 problems per day.
02
Phase 02 of 04
System Design
Weeks 3-4: System Design Concepts & Case Studies.
Weeks 3-4: Dive into System Design. Study concepts like API design, database design (SQL vs. NoSQL), caching strategies, load balancing, message queues, microservices architecture, CAP theorem, and eventual consistency. Work through common system design case studies.
Week 5: Focus on Behavioral and Leadership aspects. Prepare examples using the STAR method for common questions related to teamwork, conflict resolution, leadership, failure, and success. Research InMobi's values and culture.
04
Phase 04 of 04
Mock Interviews & Refinement
Week 6: Mock Interviews & Weakness Review.
Week 6: Mock Interviews and Review. Conduct mock interviews (technical and system design) with peers or mentors. Review weak areas identified during practice and mock interviews. Refine your communication and explanation skills.
Questions
Commonly asked.
Design a URL shortening service like TinyURL.
Implement a rate limiter.
Given a large log file, find the top K most frequent IP addresses.
Explain the trade-offs between SQL and NoSQL databases.
How would you design a distributed cache?
Describe a time you faced a significant technical challenge and how you overcame it.
How do you ensure the scalability and reliability of a system you build?
What are your thoughts on microservices vs. monolithic architecture?
Tell me about a time you disagreed with a technical decision and how you handled it.
How do you mentor junior engineers?
Locations
Regional differences.
Fig · Regions — 02 locations
01 / 02
Location
Bangalore
Interview focus
Emphasis on leadership and mentorship capabilities.Assessment of ability to drive technical initiatives.Understanding of scalability and performance in a high-traffic environment.Knowledge of specific InMobi products and their technical underpinnings.
Common questions
Discuss a challenging project you led.
How do you handle technical disagreements within a team?
Describe a time you had to mentor a junior engineer.
What are your thoughts on the latest trends in mobile advertising technology?
Tips
Be prepared to discuss your experience with large-scale distributed systems.
Highlight instances where you influenced technical direction.
Research InMobi's recent technological advancements and product launches.
Showcase your ability to mentor and lead technical teams.
Location
Remote
Interview focus
Focus on architectural design and scalability for global products.Evaluation of problem-solving skills in distributed systems.Assessment of ability to optimize performance and resource utilization.Understanding of cloud-native architectures and microservices.
Common questions
How do you approach designing a system for global scalability?
Describe a situation where you had to optimize a system for performance.
What are your strategies for ensuring code quality and maintainability?
How do you stay updated with emerging technologies relevant to ad-tech?
Tips
Prepare detailed examples of system design challenges you've overcome.
Be ready to discuss trade-offs in different architectural choices.
Demonstrate a strong understanding of data structures and algorithms, especially in the context of large datasets.
Showcase your experience with performance tuning and optimization techniques.
Rounds
Round-by-round.
Expand a step for evaluation criteria, sample questions, and prep notes.
Hard
Technical Interview (Data Structures & Algorithms) · 60 min · Senior Software Engineer / Tech Lead
This round focuses on assessing your core computer science fundamentals. You will be presented with 1-2 coding problems that require a deep understanding of data structures and algorithms. The interviewer will evaluate your ability to analyze the problem, devise an efficient solution, write clean and correct code, and discuss the time and space complexity of your approach. Expect follow-up questions on optimizations and alternative solutions.
What they look for
Strong analytical and problem-solving skills.Proficiency in coding and debugging.Ability to think through edge cases and constraints.
Evaluation
Correctness of the solution
Efficiency of the solution (time and space complexity)
Code clarity and maintainability
Problem-solving approach
Sample questions
Given an array of integers, find the contiguous subarray with the largest sum.
ArrayDynamic Programming
Implement a function to find the k-th smallest element in a binary search tree.
TreeBinary Search TreeRecursion
Design a data structure that supports insert, delete, and getRandom in O(1) average time.
Hash TableArrayData Structures
Prep for this round
01Practice coding problems on platforms like LeetCode, focusing on medium to hard difficulty.
02Be comfortable explaining your thought process step-by-step.
03Write code on a whiteboard or shared editor, simulating the interview environment.
04Consider edge cases and constraints thoroughly.
Common rejection reasons
×Inability to articulate thought process clearly.
×Lack of fundamental understanding of data structures and algorithms.
System Design Interview · 60 min · Senior Staff Engineer / Architect
This round evaluates your ability to design and architect complex systems. You will be given an open-ended problem (e.g., design Twitter's feed, design a distributed key-value store) and expected to propose a high-level design. The interviewer will probe into various aspects like data modeling, API design, scalability, performance, consistency, and fault tolerance. You need to demonstrate a strong understanding of trade-offs and justify your design decisions.
What they look for
Ability to design complex, large-scale systems.Knowledge of distributed systems principles.Pragmatic approach to problem-solving.Clear communication of technical concepts.
Evaluation
Scalability of the proposed design
Reliability and fault tolerance
Performance considerations
Clarity and justification of design choices
Understanding of trade-offs
Sample questions
Design a system like Instagram.
System DesignScalabilityDatabases
Design a distributed message queue.
System DesignDistributed SystemsConcurrency
How would you design a system to handle real-time analytics for millions of users?
System DesignReal-timeBig Data
Prep for this round
01Study common system design patterns and architectures.
02Practice designing various systems, focusing on scalability and performance.
03Be prepared to discuss databases, caching, load balancing, and message queues.
04Clearly articulate your design choices and the reasoning behind them.
Common rejection reasons
×Inability to design a scalable and robust system.
×Poor understanding of trade-offs in system design.
×Lack of clarity in explaining design choices.
×Failure to consider failure scenarios and resilience.
This round focuses on your behavioral aspects, leadership potential, and overall fit within the team and company culture. The interviewer will ask questions about your past experiences, focusing on how you've handled specific situations, managed projects, worked in teams, and demonstrated leadership. Be prepared to provide concrete examples using the STAR method.
What they look for
Evidence of leadership and mentorship.Ability to handle conflict and ambiguity.Proactive approach to challenges.Alignment with InMobi's core values.
Evaluation
Communication skills
Teamwork and collaboration
Leadership and initiative
Problem-solving approach in real-world scenarios
Cultural fit with InMobi
Sample questions
Tell me about a time you had to lead a project from start to finish.
LeadershipProject ManagementBehavioral
Describe a situation where you had a conflict with a colleague and how you resolved it.
Conflict ResolutionTeamworkBehavioral
How do you stay motivated when working on challenging or repetitive tasks?
MotivationResilienceBehavioral
Prep for this round
01Prepare specific examples using the STAR method for common behavioral questions.
02Reflect on your career goals and why you are interested in InMobi.
03Be ready to discuss your strengths and weaknesses.
04Ask thoughtful questions about the team, role, and company culture.
Common rejection reasons
×Poor communication skills.
×Lack of alignment with company values.
×Negative attitude or lack of enthusiasm.
×Inability to provide specific examples for behavioral questions.