Takeoff Technologies Interview Questions and Answers

Hacker Rank test based on leetcode easy/medium problems

Q1. Past company experience and system design.
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Q2. High level system design
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High level system design involves defining the architecture and components of a software system.
• Identify the main components of the system

• Define the interactions between components

• Consider scalability, reliability, and performance

• Use diagrams like UML to visualize the design
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Q1. High level and low level System design
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High level system design focuses on overall architecture and components, while low level system design delves into specific implementation details.
• High level system design involves defining the overall architecture and components of a system.

• Low level system design focuses on specific implementation details such as algorithms, data structures, and modules.

• High level design is more abstract and conceptual, while low lev...read more
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Q1. Design REST API
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Designing a REST API involves defining endpoints, methods, request/response formats, and authentication mechanisms.
• Identify resources and their URIs

• Choose appropriate HTTP methods for CRUD operations

• Define request/response formats (JSON, XML)

• Implement authentication and authorization mechanisms

• Use versioning to manage changes over time
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Q2. NoSQL vs SQL, merits and demerits
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NoSQL is non-relational, flexible, and scalable but lacks ACID properties. SQL is relational, structured, and ACID compliant but less scalable.
• NoSQL databases like MongoDB are schema-less and can handle unstructured data well.

• SQL databases like MySQL have a fixed schema and are better for complex queries and transactions.

• NoSQL databases are horizontally scalable, making them suitable for big data applications.

• SQL datab...read more
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Q3. Advantages of microservices
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Microservices offer scalability, flexibility, resilience, and technology diversity.
• Scalability: Microservices allow for independent scaling of different components, enabling better resource utilization.

• Flexibility: Each microservice can be developed, deployed, and scaled independently, allowing for faster iteration and updates.

• Resilience: Failure in one microservice does not necessarily affect the entire system, as oth...read more
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Q4. Find all the sibling nodes of a given node in a binary tree
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To find sibling nodes of a given node in a binary tree, we need to traverse the tree and identify nodes with the same parent.
• Traverse the binary tree starting from the root node

• Check if the current node's left and right children are not null and have the same parent as the given node

• If the conditions are met, add the sibling nodes to the result array
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Q5. What is IaaC, give examples
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IaaC stands for Infrastructure as Code, it is the practice of managing and provisioning computing infrastructure through code.
• IaaC allows for automating the process of setting up and managing infrastructure

• Examples include tools like Terraform, Ansible, and CloudFormation

• With IaaC, infrastructure can be defined and managed using code, making it easier to scale and replicate environments
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Q6. Handle concurrent requests in REST api
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Use locking mechanisms like mutex or semaphores to ensure thread safety and prevent race conditions.
• Implement thread-safe data structures like ConcurrentHashMap in Java or sync.Mutex in Go.

• Use optimistic locking techniques like versioning or compare-and-swap.

• Consider using database transactions for handling concurrent requests.

• Implement rate limiting to prevent overwhelming the server with too many requests.
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Hackerrank test 3 coding questions Medium difficulty.

Q1. Coding questions Domain Knowledge of Previous company DBMS knowledge
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Q2. Data Structures and algorithm
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Q1. Machine Coding Round
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Q2. Making a design overview of Browser ( Buttons , history, search bar) Wth use of classes and data structure
Ans. 
Designing a browser involves creating classes for buttons, history, and search functionality using appropriate data structures.
• Class: Browser - Main class to manage components like buttons, history, and search bar.

• Class: Button - Represents a button with properties like label and action (e.g., Back, Forward).

• Class: History - Stores a list of visited URLs using an array or linked list for efficient navigation.

• Class: Sea...read more
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Q1. REST APIs Monitoring Tools Multiple Technical questions and logical thinking question related to domain
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Q1. About yourself, understanding your profile
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Q1. Scenario based questions, Case study
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Case study, Scenario based questions, Leadership panel from different BU's

Q1. Hands on technical recruitment questions
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