NASDAQ Senior Backend Developer Interview Questions and Answers

Round duration - 30 minutes
Round difficulty - Easy

Basic questioning about my work experiences, things I have developed and created, my work experience(internships). The challenges which I have faced and how I overcame them. Basic questions about some android concepts

Q1. What puzzles were asked during the interview, and can you describe the projects you discussed?
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Round duration - 45 minutes
Round difficulty - Medium

The interviewer was very friendly and asked about various things and tried to judge my understanding of the projects and how deep I know about the concepts I have implemented in my projects

Q1. RxJava
RxJava
Ans. 
RxJava is a popular library for composing asynchronous and event-based programs using observable sequences.
• RxJava provides a functional API for working with asynchronous data streams.

• It uses Observables to emit items and notify subscribers.

• Operators can be used to transform, filter, and combine these streams of data.

• Schedulers are used to control the threading behavior of these operations.

• Example: Creating an Observabl...read more
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Round duration - 40 minutes
Round difficulty - Medium

This was a system design round

Q1. Can you explain the fragment lifecycle in Android system design?
Ans. 
Fragment lifecycle in Android involves various states and methods for managing UI components.
• Fragments have several lifecycle states such as created, started, resumed, paused, stopped, and destroyed.

• Methods like onCreate(), onCreateView(), onResume(), onPause(), onStop(), onDestroy() are used to manage fragment lifecycle.

• Fragment lifecycle is closely tied to the hosting Activity's lifecycle.

• Example: When a fragment is ...read more
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Q1. Questions from asp.net core
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Q1. Question from my past working experiance
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Q1. Questions on website performance improvement
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Q1. Salary discussion
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Opps Java preferred and sql related question.

Q1. Basic questions
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Q2. Future goals and plans
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Implement some LLD and use clean code formulas

Better be prepared for all deep dive questions about tech and project you worked

Q1. What is cursor, Sequence, Sql related questions
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Q2. Java related questions
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Q3. Questions based on Resume
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Q1. Past project experience and security related questions
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Q1. Questions on Java oops concepts
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Q2. Java logical coding question
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Q1. Java in depth technical questions
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Q2. Design patterns
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Q1. Salary discussion
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Q1. Difference between set/list/hashmap
Ans. 
Set, List, and HashMap are all data structures in Java with different characteristics and use cases.
• Set: Collection of unique elements, does not allow duplicates. Example: HashSet, TreeSet.

• List: Ordered collection of elements, allows duplicates. Example: ArrayList, LinkedList.

• HashMap: Key-value pair mapping, allows null keys and values. Example: HashMap, LinkedHashMap.
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