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MongoDB Consultant Engineer Interview Questions and Answers
9 Interview questions
Design schema for a movie booking system.
Create tables for movies, theaters, users, bookings, and payments.
Use foreign keys to establish relationships between tables.
Include attributes like movie title, showtime, seat number, user details, booking status, payment details, etc.
Consider implementing a booking algorithm to handle seat selection and availability.
Ensure data integrity and normalization for efficient da...
To scale the app database over India, consider sharding, replication, and using cloud services.
Implement sharding to distribute data across multiple servers based on geographic location or other criteria.
Set up replication to ensure data consistency and availability in different regions.
Utilize cloud services like AWS or Azure to easily scale resources based on demand.
Optimize queries and indexes to improve databa...
Sharding and partitioning are both techniques used in database management to improve performance and scalability by dividing data into smaller chunks.
Sharding involves splitting a database into smaller, independent databases called shards, each responsible for a subset of the data.
Partitioning involves dividing a database into smaller segments called partitions, each containing a subset of the data based on a defi...
Approaching unfamiliar coding problems requires a structured method to break down and solve them effectively.
Understand the problem: Read the question carefully and identify key requirements.
Break it down: Divide the problem into smaller, manageable parts or steps.
Research: Look for similar problems or solutions online, such as on Stack Overflow or GitHub.
Pseudocode: Write pseudocode to outline your logic before c...
We have used a combination of containerization and orchestration tools like Docker and Kubernetes for our microservices architecture.
We have followed the principles of domain-driven design to identify the boundaries of our microservices.
We have used RESTful APIs for communication between microservices.
We have implemented fault tolerance and resilience patterns like circuit breakers and retries.
We have used event-d...
Indexing strategy is a method of organizing and optimizing data retrieval from a database.
Choose appropriate data structures for indexing
Consider the size and complexity of the database
Regularly analyze and optimize the indexing strategy
Examples: B-tree, hash index, bitmap index
A multi-level parking system schema design involves creating a database to manage parking spots and their availability.
Create a database to store information about parking spots, levels, and availability
Design a user interface for customers to view available spots and reserve them
Implement a system to track the entry and exit of vehicles
Incorporate sensors or cameras to monitor parking spot availability
Consider in...
Indexing internals refer to the mechanisms and structures used to efficiently retrieve data from databases.
B-trees are commonly used for indexing in databases, allowing for efficient searching, insertion, and deletion.
Hash indexing uses a hash function to map keys to specific locations, providing fast access for equality searches.
Bitmap indexes are effective for columns with a limited number of distinct values, op...
The 3 basic components of a database are data, schema, and software. An RCA for a DB being down involves identifying the root cause of the issue.
Data: the actual information stored in the database, such as customer records or product details.
Schema: the structure that defines how the data is organized and related to each other, including tables, fields, and relationships.
Software: the database management system (D...
MongoDB Consultant Engineer Interview Experiences
3 interviews found
Anonymous
I applied via Company Website and was interviewed in Nov 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Design schema for movie booking system ?
- Ans.
Design schema for a movie booking system.
Create tables for movies, theaters, users, bookings, and payments.
Use foreign keys to establish relationships between tables.
Include attributes like movie title, showtime, seat number, user details, booking status, payment details, etc.
Consider implementing a booking algorithm to handle seat selection and availability.
Ensure data integrity and normalization for efficient data re...
- Q2. How would u scale the app (database wise) over India ?
- Ans.
To scale the app database over India, consider sharding, replication, and using cloud services.
Implement sharding to distribute data across multiple servers based on geographic location or other criteria.
Set up replication to ensure data consistency and availability in different regions.
Utilize cloud services like AWS or Azure to easily scale resources based on demand.
Optimize queries and indexes to improve database pe...
(2 Questions)
- Q1. What is sharding vs partitioning
- Ans.
Sharding and partitioning are both techniques used in database management to improve performance and scalability by dividing data into smaller chunks.
Sharding involves splitting a database into smaller, independent databases called shards, each responsible for a subset of the data.
Partitioning involves dividing a database into smaller segments called partitions, each containing a subset of the data based on a defined c...
- Q2. What are the 3 basic components of database, and do a RCA for why a DB is down.
- Ans.
The 3 basic components of a database are data, schema, and software. An RCA for a DB being down involves identifying the root cause of the issue.
Data: the actual information stored in the database, such as customer records or product details.
Schema: the structure that defines how the data is organized and related to each other, including tables, fields, and relationships.
Software: the database management system (DBMS) ...
Selected
I applied via LinkedIn and was interviewed before Oct 2022. There were 7 interview rounds.
(1 Question)
- Q1. Basic questions around yourself, and your communication skills were monitored. The overall language capabilities were checked to ensure that you were a good fit for the organisation. Since the role was a c...
(1 Question)
- Q1. Schema Designing questions on how you would design a certain use case with MongoDB. This was done to understand your technical knowledge about database systems
(1 Question)
- Q1. System design questions, on how you would design the architecture of a system based on a certain use case. This was done to understand the thinking capabilities around system architecture and figuring out ...
(1 Question)
- Q1. Coding questions, to understand what you would do to approach a certain problem, especially when found to be out of your wheelhouse.
- Ans.
Approaching unfamiliar coding problems requires a structured method to break down and solve them effectively.
Understand the problem: Read the question carefully and identify key requirements.
Break it down: Divide the problem into smaller, manageable parts or steps.
Research: Look for similar problems or solutions online, such as on Stack Overflow or GitHub.
Pseudocode: Write pseudocode to outline your logic before coding...
(1 Question)
- Q1. Coding questions, to understand your approach to problems and gauge your problem solving skills and technical depth.
(1 Question)
- Q1. Final interview with head of department
Interview Preparation Tips
I applied via Recruitment Consultant and was interviewed in Dec 2020. There were 5 interview rounds.
Interview Questionnaire
5 Questions
- Q1. Schema design for Multi-Level Parking System?
- Ans.
A multi-level parking system schema design involves creating a database to manage parking spots and their availability.
Create a database to store information about parking spots, levels, and availability
Design a user interface for customers to view available spots and reserve them
Implement a system to track the entry and exit of vehicles
Incorporate sensors or cameras to monitor parking spot availability
Consider integra...
- Q2. Indexing Strategy?
- Ans.
Indexing strategy is a method of organizing and optimizing data retrieval from a database.
Choose appropriate data structures for indexing
Consider the size and complexity of the database
Regularly analyze and optimize the indexing strategy
Examples: B-tree, hash index, bitmap index
- Q3. Indexing Internals?
- Ans.
Indexing internals refer to the mechanisms and structures used to efficiently retrieve data from databases.
B-trees are commonly used for indexing in databases, allowing for efficient searching, insertion, and deletion.
Hash indexing uses a hash function to map keys to specific locations, providing fast access for equality searches.
Bitmap indexes are effective for columns with a limited number of distinct values, optimiz...
- Q4. Index Optimizations?
- Q5. Architectures for the Microservices you have recently worked on?
- Ans.
We have used a combination of containerization and orchestration tools like Docker and Kubernetes for our microservices architecture.
We have followed the principles of domain-driven design to identify the boundaries of our microservices.
We have used RESTful APIs for communication between microservices.
We have implemented fault tolerance and resilience patterns like circuit breakers and retries.
We have used event-driven...
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I applied via Approached by Company and was interviewed before Jun 2021. There were 2 interview rounds.
(1 Question)
- Q1. Advantage and disadvantage of framework.
- Ans.
Frameworks provide structure and pre-built components for software development, but can also limit flexibility and require learning curve.
Advantage: Provides structure and pre-built components for faster development
Advantage: Can improve code quality and maintainability
Disadvantage: Can limit flexibility and customization
Disadvantage: Requires learning curve and potential dependency issues
Example: ReactJS provides a fr...
(1 Question)
- Q1. What is Oops? Advantage and disadvantage
- Ans.
Oops stands for Object-Oriented Programming. It is a programming paradigm that uses objects to represent real-world entities.
Advantages: code reusability, modularity, encapsulation, inheritance, polymorphism
Disadvantages: complexity, steep learning curve, performance overhead
Example: creating a class 'Car' with properties like 'make', 'model', and 'year', and methods like 'start_engine' and 'stop_engine'
Interview Preparation Tips
Skills evaluated in this interview
Rohit Kr Shaw
I applied via Naukri.com and was interviewed before Sep 2021. There was 1 interview round.
(1 Question)
- Q1. Basic Oracle Architecture, RAC Setup, Golden Gate Troubleshooting, Data Guard recover, RMAN restoration
Interview Preparation Tips
I applied via Company Website and was interviewed before Jul 2020. There were 3 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Scrum
- Q2. Agile
Interview Preparation Tips
Interview Questionnaire
2 Questions
- Q1. Algorithm and Trick questions on Java
- Q2. Your future interest, interaction capabilities
Interview Preparation Tips
Experience: Mention only those projects/works which you feel fully confident on, let any question be thrown your way.
Believe me, a simple project explained in a good way is better than a complex project that scares you going into the details.
Tips: A little bit of extra activities (sports/music) helps them picture you as not a total nerd, which might help in front of some interviewers.
Round: Interview
Experience: They will mostly try to trick you here, even if you are right, they will make you doubt yourself. It's just about believing oneself and answering in one go.
Tips: Stick to your answers if you feel it's right, changing it again and again won't do you much good.
Round: Interview
Experience: This is where you have to be most careful, what they seek is just your interest in the company or infact passion for their work and not leaving them mid-way for higher studies or startup plans.
Tips: Diverting talks to some extra-currics might help a lot here specially if they have interest in that too, like the one, I was giving interview to, was wearing a Barcelona cap and I had mentioned that I played football at Inter-Hostel level. So we talked about the recent Premier league for like 10 minutes and the mood was really lightened, thanks to that.
General Tips: It is never too late to be what you might have been.
Skills: Algorithms, Java, Interaction Skills, coding, C, C++
College Name: IIT DELHI
Motivation: The technology (Social-Media Management) they are working on is really interesting to know more about and can be a future pioneer in the coming days.
Funny Moments: One of the interviewer I became so friendly with, mid-way through the interview that we added each other right there on facebook.
Interview Preparation Tips
Experience: They asked to write 2 codes on recursion. Then some questions on resume. I asked them about the job profile and after knowing that they were hiring candidates for frontend programming, about which they didn’t mention in JAF. I told them that I was not interested in frontend development. And didn’t even answer any question after that. Unfortunately, I was selected.
General Tips: Plan your schedule judiciously keeping your capacity in mind. There is no point of making ideal plans and then not able to do even 50% of it.
Don’t get into unnecessary arguments or debate with people.
Don’t think about what others are doing. Focus on your preparation.
How you carry yourself matters. So, make sure you portray yourself in the way you want the other person to perceive you.
Be selective while applying for companies.
College Name: IIT Kanpur
Varun Thopucherla
Interview Questionnaire
10 Questions
- Q1. Tell about yourself?
- Ans.
I am a software engineer with experience in developing web applications and mobile apps.
Proficient in programming languages such as Java, Python, and JavaScript
Experience in developing RESTful APIs and integrating third-party APIs
Familiarity with front-end frameworks such as React and Angular
Strong understanding of database management systems such as MySQL and MongoDB
Passionate about learning new technologies and keepi...
- Q2. Why Software industry? why not core?
- Ans.
Software industry offers endless opportunities for innovation and growth.
Software industry is constantly evolving and offers opportunities to work on cutting-edge technologies.
It provides a platform to solve complex problems and create innovative solutions.
The demand for software engineers is high and the industry offers competitive salaries.
Core industries may have limited scope for growth and innovation compared to s...
- Q3. Write a program to print the given string in reverse
- Ans.
Program to print a given string in reverse
Create a character array of the given string
Loop through the array from end to start and print each character
- Q4. Some questions about computer networks and Digital electronics
- Q5. What is Mux? what are its real life applications?
- Ans.
Mux is a device that selects one of several input signals and forwards the selected input into a single output line.
Mux stands for Multiplexer.
It is used in digital circuits to select one of several input signals and forward the selected input into a single output line.
It is used in communication systems to combine multiple signals into a single channel for transmission.
It is used in video and audio systems to switch b...
- Q6. What is DeMux? what are its real life applications?
- Ans.
DeMux is short for Demultiplexer. It is a digital circuit that takes one input and directs it to multiple outputs.
DeMux is used in digital communication systems to separate signals that have been combined for transmission.
It is also used in computer memory systems to select a specific memory location.
DeMux is used in video and audio systems to separate different channels of information.
It is used in automation systems ...
- Q7. Difference between decoder and Demux
- Ans.
Decoder converts encoded data into a readable format while Demux separates a single input into multiple outputs.
Decoder is used to decode encoded data such as binary data into a readable format.
Demux is used to separate a single input into multiple outputs based on the control signals.
Decoder is a combinational circuit while Demux is a sequential circuit.
Decoder is used in applications such as remote controls, computer...
- Q8. Why amadeus labs?
- Ans.
Amadeus Labs is a leading technology company in the travel industry.
Amadeus Labs provides opportunities to work on cutting-edge technologies.
The company has a strong focus on innovation and research.
Amadeus Labs has a global presence and offers a diverse and inclusive work environment.
Working at Amadeus Labs provides the opportunity to make a real impact on the travel industry.
The company values work-life balance and o...
- Q9. Are you comfortable in working for Testing?
- Ans.
Yes, I am comfortable working for Testing.
I have experience in testing and understand its importance in software development.
I am willing to learn new testing techniques and tools.
I am comfortable working with testing teams and collaborating with them to ensure quality software.
I understand the importance of testing in ensuring customer satisfaction and reducing costs.
Examples: I have experience in manual and automated...
- Q10. Why do you consider yourself suitable for developer role?
- Ans.
I have the necessary skills and experience to excel in the developer role.
I have a degree in computer science and have completed multiple coding projects.
I am proficient in programming languages such as Java, Python, and C++.
I have experience working with databases and web development frameworks.
I am a quick learner and enjoy solving complex problems.
I am a team player and have collaborated with other developers on var...
Interview Preparation Tips
Experience: The test was conducted online. All the questions were of medium standard and easy to crack if we have patience for thinking.
English comprehension level is slightly below the standard of CAT. Those who have the habit of reading English news paper can easily crack the test.
Data analysis questions were also of medium standard. Those who have knowledge about graphs, bar & pie charts can easily crack the exam.
Tips: Practice Aptitude questions from R S Agarwaal book and CAT material.
Round: Technical Interview
Experience: Over all interview experience is cool. Interviewers never grilled on anything. In many cases they have helped me to arrive at answers.
Tips: Read C++ and Oops concepts from E Balaguruswamy text book.
For Data structures and algorithms read 'Data structures' by Yeshwant kanethkar.
Minimum knowledge about all the courses of your department will be an added advantage. This will help you to depict you are sincere in your studies and don't have any personal constraints in learning a new thing.
General Tips: Just be confident and believe in yourself. You will get through.
Skills: Programming skill in C++
College Name: NIT Warangal
Motivation: No special motivation. It is a rapidly growing company offering good package.
Skills evaluated in this interview
I appeared for an interview in Aug 2016.
Interview Preparation Tips
Experience: The questions were tricky. We were given a paragraph and after reading it, a statement was given to us and we were asked to say if it is true, false or cannot say. The structure of the statement put us into a a tough place. So practice of such kind of questions is necessary.
For data interpretation questions a good hand on basic statistical mathematics is needed. One has to be quick because of the time crunch. The questions were approachable
Round: Technical Interview
Experience: In this round my resume was scanned and I was required to speak about myself, my projects and explain certain areas of my resume. The interviewer picked up one of my basic project, surprisingly, and asked me to elaborate on it. He asked me how I can improve the project. And I had to write a code to make that change. Basically, one should have a good idea about the projects they've done/ mentioned in their resume. And know it in detail.
Few questions on data structures. Prepare well for coding type questions and data structures.
Round: Puzzle Interview
Experience: The interviewer asked me two puzzles. They were moderate level. And also luckily he was helpful whenever I got stuck.
Round: HR Interview
Experience: HR round was good. Basic questions like " tell me more about yourself", brief information about my past history, college life, extra curricular activities. In the end she asked me, "should we hire you?" And I lightly answered " why not!" So it was a good interview overall.
Skills: Coding Skills, Team Working Ability, Project management
College Name: Visvesvaraya National Institute Of Technology
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