Amadeus Principal Engineer Interview Questions and Answers

Medium questions, related to voting

Q1. System design for tagging system
Ans. 
Design a system for tagging system
• Consider scalability and performance requirements

• Use a unique identifier for each tag

• Implement a search functionality for tags

• Ensure data consistency and integrity

• Consider security measures to prevent unauthorized access
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Q1. What do you know about Credit Card Transaction lifecycle
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Credit card transaction lifecycle involves authorization, clearing, and settlement processes.
• Authorization: Initial approval of the transaction by the card issuer.

• Clearing: The process of exchanging transaction details between the merchant and the card issuer.

• Settlement: The final transfer of funds from the cardholder's account to the merchant's account.

• Chargeback: A reversal of a transaction due to disputes or fraud.

• I...read more
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Q1. Oops concepts, Scenario based QA question
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Q1. This one also technical round and various testing concepts
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Q1. Offshore round on technical discussion.
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Q1. What are your salary expectations?
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Q2. Why are you looking for a change?
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Q3. Why should we hire you?
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Q4. Where do you see yourself in 5 years?
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Q5. Tell me about yourself.
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Q1. Design a efficiënte db read
Ans. 
Efficient database read design
• Use indexing to quickly locate data

• Minimize the number of reads by fetching only necessary columns

• Consider denormalizing data for faster reads

• Implement caching mechanisms to reduce database load

• Optimize queries by avoiding unnecessary joins
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Q2. Exception handling
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Q3. Customruntime exception
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Q4. Design abstract factory
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Q5. Design a system to read the data efficiently without iterating on record repeatedly
Ans. 
Use indexing to access data directly without iterating
• Implement a database with proper indexing on key fields

• Utilize data structures like hash tables or binary search trees for quick access

• Consider using caching mechanisms to store frequently accessed data

• Optimize queries by using efficient algorithms like merge sort or quicksort
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Most votes by a candidate given that people can give preference vote

Q1. Design Tagging System
Ans. 
Design a tagging system for organizing and categorizing data.
• Consider the types of data to be tagged (e.g. text, images, videos)

• Create a standardized set of tags and categories

• Allow for multiple tags to be assigned to each piece of data

• Implement a search function based on tags

• Consider implementing a hierarchy of tags for more complex categorization
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Q1. Linked list implementation
Ans. 
Linked list is a data structure where each element points to the next element in the sequence.
• Nodes contain data and a reference to the next node

• Operations include insertion, deletion, and traversal

• Example: Singly linked list, Doubly linked list
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Q2. Arrays related DSA
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Q1. What you know about UKG
Ans. 
UKG is a leading provider of HR, payroll, and workforce management solutions.
• UKG stands for Ultimate Kronos Group, formed by the merger of Kronos Incorporated and Ultimate Software.

• They offer cloud-based human capital management software for HR, payroll, and workforce management.

• Their solutions help organizations streamline processes, improve employee engagement, and drive better business outcomes.
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Q2. Salary expectations
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Challenges on Leetcode that are classified as hard and can be coded using an IDE along with test cases.

Low level design of parking lot

Q1. System design of a scalable distributed system
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Q1. HashMap internal implementation
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Q1. Difference between hashMap and concurrent HashMap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe and allows concurrent modifications.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified concurrently.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on differen...read more
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