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    Top 50 MongoDB Interview Questions And Answers

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    Top 50 MongoDB Interview Questions And Answers

    Edited By Team Careers360 | Updated on Nov 30, 2023 04:51 PM IST | #Database Management

    MongoDB is a NoSQL database known for flexibility, scalability, and document-oriented storage and retrieval. So if you are appearing for a MongoDB interview we will help equip you with the knowledge to conquer MongoDB interviews. So, we bring you the top 50 MongoDB Interview Questions and Answers tailored for aspiring developers and data administrators. We have divided this article into two sections–MongoDB interview questions for freshers and experienced in an easy-to-understand manner. Read more to know about Online Sql Courses!

    Top 50 MongoDB Interview Questions And Answers
    Top 50 MongoDB Interview Questions And Answers

    MongoDB Interview Questions For Freshers:

    1. What are the key features of MongoDB?

    MongoDB offers several important features, including indexing for improved search performance, replication for data distribution, support for ad-hoc queries through indexing, a flexible schema-less design, and sharding for large datasets and high throughput operations. This is one of the most important MongoDB basic interview questions and also very important.

    2. What is the role of indexing in MongoDB?

    Indexing in MongoDB is used to enhance search performance. It creates organised data structures that help in quickly locating documents based on specific fields, leading to faster query execution. These types of MongoDB interview questions for freshers are a must to excel in interviews.

    3. Can you elaborate on MongoDB Indexes?

    In MongoDB, indexes play a crucial role in optimising query performance. They are data structures that allow for efficient retrieval of documents within a collection. An index is created based on one or more fields in a collection, and it sorts and stores the field values in a way that makes it faster to search for specific documents. This means that queries can leverage indexes to swiftly locate and retrieve relevant data, significantly enhancing the overall responsiveness of the database. Indexes can be applied to a single field or a combination of fields, offering a flexible approach to fine-tuning database performance.

    4. How does MongoDB handle data replication?

    MongoDB employs replication to distribute data across different machines, ensuring high availability. A primary node handles writes, while secondary nodes replicate data asynchronously to maintain data consistency. Do prepare these MongoDB interview questions for freshers.

    5. What is the purpose of MongoDB's database profiler?

    MongoDB's database profiler is used to analyse the performance of each operation against the database. It helps identify slower queries or write operations that need optimisation. Freshers must prepare these MongoDB basic interview questions to excel in their interviews.

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    6. How does sharding work in MongoDB?

    Sharding is used in MongoDB to enable deployments with large datasets. It divides data into smaller chunks and distributes them across different servers or clusters, improving scalability and performance. Go through these categories of MongoDB interview questions and answers for experienced ones thoroughly to improve your skills.

    7. Is MongoDB suitable for representing relationships between data?

    MongoDB's schema-less design makes it challenging to represent complex relationships between data. In such cases, developers often need to manually create additional collections to represent these relationships.

    8. Can you explain how MongoDB handles write durability?

    MongoDB writes to disk are lazy by default, meaning data may not be immediately flushed to disk. The getLastError call confirms successful write operations, but durability is independent of this call. To give creative answers you must go through these essential MongoDB basic interview questions.

    9. Why is it suggested to start with Non-Sharded MongoDB for beginners?

    This is one of the top recommended MongoDB interview questions and answers for experienced. Starting with Non-Sharded MongoDB is recommended for simplicity and quick setup. It is suitable unless your data set is too large for a single server. Upgrading to Sharded MongoDB is seamless when needed.

    10. What happens during a replica set failover in MongoDB?

    A replica set failover occurs when the primary node becomes unavailable. Other members detect this and elect a new primary node. During this time, the cluster is down for primary operations, but eventually consistent queries can be executed on secondaries.

    11. What is the significance of using journaling in MongoDB?

    Journaling in MongoDB provides a mechanism for safe hot backups and crash recovery. It ensures that write operations are recorded before actual data changes occur. These kinds of MongoDB interview questions for freshers can be asked by the interviewer to check your knowledge.

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    12. Can you explain the advantages of using MongoDB's schema-less design?

    MongoDB's schema-less design allows for flexibility in data structure. This can be advantageous when dealing with dynamic or evolving data that does not fit neatly into predefined tables. These are the specifically designed MongoDB interview questions and answers for experienced developers to help them prepare confidently for their interview.

    13. How does MongoDB handle slow or unresponsive shards during queries?

    If a shard is slow or unresponsive, Mongos (the query router) will wait for it to respond. If a shard is down, the 'Partial' query option can be set to allow querying the available shards. This is one of the must know MongoDB basic interview questions.

    14. What is the recommended approach for upgrading to Sharded MongoDB?

    It is suggested to start with Non-Sharded MongoDB for simplicity and then upgrade to Sharded when your data set becomes large. MongoDB makes upgrading to Sharded environments relatively straightforward. To test you knowledge on this topic, the interviewer can ask these types of MongoDB basic interview questions from you.

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    15. Can you explain why MongoDB is considered suitable for analytics and caching?

    These are one of the top MongoDB interview questions for freshers. MongoDB's design makes it suitable for analytics and caching scenarios where small data loss is tolerable. However, due to its asynchronous and batch commit nature, it is not always ideal for applications requiring strict data durability.

    16. What are the key features of MongoDB?

    MongoDB offers features like indexing, replication, flexible schema design, ad-hoc queries, and sharding for scalability. This is one of the must-know MongoDB interview questions and answers.

    17. How does indexing enhance search performance in MongoDB?

    This is one of the top MongoDB interview questions for freshers. Indexing creates organised data structures that help locate documents based on specific fields, leading to faster query execution.

    18. Can you explain what a namespace is in MongoDB?

    A namespace in MongoDB represents a pivotal element in the database's architecture. It is the harmonious fusion of a database name and a collection name. This composite identifier serves as a distinctive label for collections within the database, offering a vital reference point for data retrieval and manipulation. By encapsulating these vital components, MongoDB not only establishes a clear and organised data hierarchy but also streamlines access to specific data entities. This meticulous namespace construction is central to MongoDB's ability to efficiently manage data, ensuring that operations are executed with precision and accuracy across an array of datasets, thereby underpinning the database's overall effectiveness.

    19. How does MongoDB handle data replication for high availability?

    MongoDB's approach to ensuring high availability revolves around a robust replication strategy. Within this framework, a primary node is designated to handle write operations, serving as the authoritative source of truth. Simultaneously, secondary nodes replicate this data, thus guaranteeing consistency and durability. This redundancy not only provides a safety net against hardware failures and unforeseen outages but also amplifies the overall reliability and resilience of the database system. By maintaining multiple synchronised copies of the data, MongoDB fortifies its capacity to withstand disruptions, ensuring that critical information remains accessible and intact even in the face of unexpected challenges.

    20. What is the role of MongoDB's database profiler?

    MongoDB's database profiler is used to analyse the performance of operations against the database, identifying slow queries for optimisation. This is one of the top MongoDB interview questions and answers to prepare.

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    21. How does sharding work in MongoDB?

    Sharding in MongoDB is a sophisticated architectural technique designed to enhance the scalability and performance of the database system. It achieves this by segmenting the data into smaller, more manageable units called shards, which are then distributed across multiple servers or clusters. This strategic partitioning of data allows for parallel processing of queries, significantly boosting query throughput and response times. By efficiently distributing the workload, MongoDB optimises the retrieval and manipulation of data, enabling it to scale gracefully with growing datasets. This pivotal feature empowers MongoDB to seamlessly adapt to evolving data demands, ensuring that the database system remains responsive and performant even as data volumes escalate.

    22. Is MongoDB suitable for representing complex relationships between data?

    MongoDB's schema-less design makes it challenging, often requiring manual creation of additional collections.

    23. Why is journaling important in MongoDB?

    Journaling ensures safe backups and crash recovery by recording write operations before actual data changes occur. You must prepare these kinds of MongoDB interview questions for freshers for a thorough understanding.

    24. What is the suggested starting point for beginners with MongoDB?

    For individuals embarking on their MongoDB journey, commencing with a Non-Sharded MongoDB configuration is recommended. This simplified setup provides a solid foundation for understanding the intricacies of the database system. As the dataset expands and complexities arise, transitioning to a Sharded configuration becomes a prudent step to accommodate the increased scale. Sharding offers a powerful solution to distribute the load across multiple nodes, thereby maintaining optimal performance. This phased approach allows beginners to gradually acclimate to the nuances of MongoDB, ensuring a smooth and effective learning curve as they delve deeper into the world of advanced database management.

    25. How does MongoDB handle replica set failover?

    In a failover, secondary nodes detect the primary's unavailability and elect a new primary node. The cluster is down for primary operations temporarily. This is one of the most important MongoDB interview questions for freshers.

    MongoDB Interview Questions And Answers For Experienced Professionals:

    1. Can you explain how MongoDB handles data replication and failover?

    MongoDB employs replication to distribute data across nodes in a replica set. In a failover event, the primary node's unavailability triggers a new primary election, maintaining high availability. These are one of the most important MongoDB advanced interview questions which you must learn.

    2. How does MongoDB ensure data consistency in a replica set?

    These MongoDB technical interview questions are very important and should be prepared thoroughly. MongoDB uses an asynchronous replication process, where secondary nodes replicate data from the primary node's oplog. While replication is not immediate, the goal is to keep secondary nodes as close to the primary's state as possible.

    3. What is the purpose of MongoDB's journaling feature?

    These are one of the most important MongoDB interview questions for experienced professionals. MongoDB's journaling ensures durability and crash recovery. It records write operations in a journal before applying changes to the data files, providing a mechanism for safe backups and preventing data loss.

    4. Can you explain the impact of a 32-bit edition's data limit in MongoDB?

    The 32-bit edition of MongoDB has a 2GB data limit. If the data exceeds this limit, including existing data, it can lead to corruption. This limitation is not present in the 64-bit edition.

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    5. How does MongoDB handle write durability without using 'getLastError'?

    MongoDB writes are durable even without using 'getLastError'. The 'getLastError' call confirms write success, but writes are committed to disk regardless. You can consider these types of MongoDB advanced interview questions as very important from an interview point of view.

    6. What are the advantages and disadvantages of using MongoDB's schema-less design?

    The schema-less design allows flexibility in data structure, ideal for certain use cases like dynamic content. However, it can complicate representing complex relationships and querying. You must prepare these MongoDB interview questions for experienced professionals as they have a high chance of being asked in the interview.

    7. How does MongoDB manage data distribution and balancing in a sharded environment?

    MongoDB uses sharding to distribute data across shards. The balancer ensures even data distribution by migrating chunks between shards based on the defined chunk size. Experienced ones must go through these types of MongoDB technical interview questions thoroughly.

    8. What factors should be considered when deciding to shard a MongoDB deployment?

    Sharding should be considered for deployments with large datasets that exceed the capacity of a single server. It is recommended to start with Non-Sharded for simplicity and then shard when necessary.

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    9. Can you explain the process of handling slow or unresponsive shards in MongoDB?

    Mongos will wait for slow shards to respond, and if a shard is down, queries will return an error by default. The 'Partial' query option allows querying available shards even when some are down. You must thoroughly go through these important MongoDB advanced interview questions.

    10. How does MongoDB address the challenges of representing complex relationships between data?

    MongoDB's schema-less design makes representing complex relationships challenging. Developers often need to manually manage relationships by creating additional collections or using denormalisation.

    11. What techniques can be used to optimise MongoDB queries?

    MongoDB offers indexing, query optimisation, and aggregation frameworks to improve query performance. Profiling slow queries and ensuring indexes are appropriately used can lead to significant performance gains.

    12. How does MongoDB handle data fragmentation and file sizes?

    MongoDB performs aggressive preallocation of reserved space to avoid file system fragmentation. This helps maintain efficient storage and access times, especially in cases of frequent data updates.

    13. What is the significance of the oplog in MongoDB's replication process?

    This is one of the most essential interview questions on MongoDB for experienced developers. The oplog (operation log) is a capped collection that stores write operations. Secondary nodes use the oplog to replicate data changes from the primary node, ensuring data consistency.

    14. Can you explain the trade-offs between MongoDB's asynchronous replication and traditional locking/transaction models?

    This is one of the top MongoDB interview questions for experienced professionals. MongoDB's asynchronous replication enhances performance but may lead to eventual consistency. It is similar to MySQL's MyISAM autocommit model, emphasising simplicity and performance over complex locking.

    15. How does MongoDB handle migration and ownership transfer during sharding operations?

    Preparation of these MongoDB technical interview questions are considered a must for experienced programmers. MongoDB's balancer migrates chunks between shards while maintaining consistency. Data changes on the old shard are replicated to the new shard before ownership transfer, ensuring data integrity.

    16. How does MongoDB ensure data consistency in a replica set?

    MongoDB uses asynchronous replication, where secondary nodes replicate data from the primary node's oplog to maintain data consistency.

    17. Explain the purpose of MongoDB's journaling feature.

    Journaling provides durability and crash recovery by recording write operations in a journal before applying data changes. This is one of the most important MongoDB interview questions and answers for experienced professionals.

    18. What is the impact of a 32-bit edition's data limit in MongoDB?

    The 32-bit edition has a 2GB data limit; exceeding this limit, including existing data, can lead to corruption.

    19. How does MongoDB handle write durability without 'getLastError'?

    MongoDB writes are durable even without 'getLastError'; writes are committed to disk regardless. You must practice these kinds of MongoDB interview questions and answers for experienced developers for an in-depth understanding.

    Also read: 20 Online MongoDB Courses to Become Database Designer

    20. What are the advantages and disadvantages of MongoDB's schema-less design?

    The schema-less design allows flexibility in data structure, but can complicate representing complex relationships and querying.

    21. How does MongoDB manage data distribution and balancing in sharded environments?

    MongoDB uses sharding to distribute data, and the balancer migrates chunks between shards to maintain even data distribution.

    22. What factors should be considered when deciding to share a MongoDB deployment?

    Sharding should be considered for large datasets exceeding a single server's capacity. This is considered as one of the most essential MongoDB interview questions and answers for experienced professionals.

    23. How does MongoDB handle slow or unresponsive shards during queries?

    Mongos will wait for slow shards to respond, and if a shard is down, queries will return an error by default.

    24. How does MongoDB address the challenges of representing complex relationships between data?

    MongoDB's schema-less design makes representing complex relationships challenging, often requiring manual management.

    25. What techniques can be used to optimise MongoDB queries?

    Techniques include indexing, query optimisation, and using aggregation frameworks. Profiling slow queries and ensuring proper index usage are key. Prepare these kinds of MongoDB interview questions and answers to excel in your interview.

    Conclusion

    In this compilation of interview questions on MongoDB , we have covered a wide spectrum of topics, from interview questions on MongoDB for experience to the core features of the MongoDB basic interview questions. These insights of MongoDB interview questions and answers will serve as a valuable resource, catering to both beginners and experienced practitioners in the dynamic environment of database management.

    Also Read: 18 beginner courses on Django to become a full stack Python developer

    Frequently Asked Question (FAQs)

    1. Why is MongoDB interview preparation important?

    Thorough preparation ensures you are well-versed in MongoDB concepts, boosting your confidence during interviews and increasing your chances of success.

    2. What are the key topics to cover in MongoDB interview preparation?

    Focus on MongoDB basics, data modeling, indexing, querying, aggregation, replication, sharding, transactions, and common performance optimisation techniques.

    3. What are some common MongoDB interview questions for freshers?

    Expect questions about MongoDB's features, schema-less design, indexing, CRUD operations, and understanding the difference between SQL and NoSQL databases.

    4. What MongoDB advanced interview questions should experienced candidates focus on?

    Dive into in-depth understanding of replication, sharding strategies, aggregation pipeline, data modeling best practices, and ways to optimise query performance.

    5. How can I demonstrate practical experience with MongoDB during interviews?

    Showcase personal projects, contributions to open-source projects, or describe scenarios where you have effectively used MongoDB to solve real-world problems.

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    Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.

    3 Jobs Available
    Talent Agent

    The career as a Talent Agent is filled with responsibilities. A Talent Agent is someone who is involved in the pre-production process of the film. It is a very busy job for a Talent Agent but as and when an individual gains experience and progresses in the career he or she can have people assisting him or her in work. Depending on one’s responsibilities, number of clients and experience he or she may also have to lead a team and work with juniors under him or her in a talent agency. In order to know more about the job of a talent agent continue reading the article.

    If you want to know more about talent agent meaning, how to become a Talent Agent, or Talent Agent job description then continue reading this article.

    3 Jobs Available
    Radio Jockey

    Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.

    A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.

    3 Jobs Available
    Videographer
    2 Jobs Available
    Multimedia Specialist

    A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications. 

    2 Jobs Available
    Producer

    An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story. 

    They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.

    2 Jobs Available
    Copy Writer

    In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook. 

    5 Jobs Available
    Journalist

    Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.

    3 Jobs Available
    Publisher

    For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.

    3 Jobs Available
    Vlogger

    In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion. 

    Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article. 

    3 Jobs Available
    Editor

    Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

    3 Jobs Available
    Advertising Manager

    Advertising managers consult with the financial department to plan a marketing strategy schedule and cost estimates. We often see advertisements that attract us a lot, not every advertisement is just to promote a business but some of them provide a social message as well. There was an advertisement for a washing machine brand that implies a story that even a man can do household activities. And of course, how could we even forget those jingles which we often sing while working?

    2 Jobs Available
    Photographer

    Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.

    2 Jobs Available
    Social Media Manager

    A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.

    2 Jobs Available
    Welding Engineer

    Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

    5 Jobs Available
    QA Manager
    4 Jobs Available
    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    Quality Controller

    A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product. 

    A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

    3 Jobs Available
    Production Manager
    3 Jobs Available
    Team Lead

    A Team Leader is a professional responsible for guiding, monitoring and leading the entire group. He or she is responsible for motivating team members by providing a pleasant work environment to them and inspiring positive communication. A Team Leader contributes to the achievement of the organisation’s goals. He or she improves the confidence, product knowledge and communication skills of the team members and empowers them.

    2 Jobs Available
    Procurement Manager

    The procurement Manager is also known as  Purchasing Manager. The role of the Procurement Manager is to source products and services for a company. A Procurement Manager is involved in developing a purchasing strategy, including the company's budget and the supplies as well as the vendors who can provide goods and services to the company. His or her ultimate goal is to bring the right products or services at the right time with cost-effectiveness. 

    2 Jobs Available
    Merchandiser

    A career as a merchandiser requires one to promote specific products and services of one or different brands, to increase the in-house sales of the store. Merchandising job focuses on enticing the customers to enter the store and hence increasing their chances of buying a product. Although the buyer is the one who selects the lines, it all depends on the merchandiser on how much money a buyer will spend, how many lines will be purchased, and what will be the quantity of those lines. In a career as merchandiser, one is required to closely work with the display staff in order to decide in what way a product would be displayed so that sales can be maximised. In small brands or local retail stores, a merchandiser is responsible for both merchandising and buying. 

    2 Jobs Available
    AWS Solution Architect

    An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party. 

    4 Jobs Available
    QA Manager
    4 Jobs Available
    Azure Administrator

    An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems. 

    4 Jobs Available
    Information Security Manager

    Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

    3 Jobs Available
    Computer Programmer

    Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

    3 Jobs Available
    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

    3 Jobs Available
    ITSM Manager
    3 Jobs Available
    .NET Developer

    .NET Developer Job Description: A .NET Developer is a professional responsible for producing code using .NET languages. He or she is a software developer who uses the .NET technologies platform to create various applications. Dot NET Developer job comes with the responsibility of  creating, designing and developing applications using .NET languages such as VB and C#. 

    2 Jobs Available
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