Fidelity Investments Interview Questions and Answers

Q1. Zookeeper role in Kafka
Ans. 
Zookeeper is used for managing Kafka cluster and maintaining its metadata.
• Zookeeper stores metadata about Kafka brokers, topics, partitions, and consumer groups.

• It helps in leader election and broker failure detection.

• Kafka clients use Zookeeper to discover the current state of the Kafka cluster.

• Zookeeper also helps in maintaining the offset of messages consumed by a consumer group.
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Q2. What is OAuth Topic vs Queue
Ans. 
OAuth is an open standard for authorization that allows users to share their private resources stored on one site with another site.
• OAuth allows users to grant access to their private resources on one site to another site without sharing their credentials.

• It is commonly used by social media platforms to allow users to sign in to third-party apps using their social media accounts.

• OAuth 2.0 is the most widely used versio...read more
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Q1. OOPS Questions like Polymorphism, encapsulation, abstraction, inheritance
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Q2. What is Object and class
Ans. 
Objects are instances of classes, which define the blueprint for creating them in object-oriented programming.
• A class is a blueprint for creating objects, defining properties and methods.

• An object is an instance of a class, containing specific data.

• Example: A 'Car' class may have properties like 'color' and 'model', while an object could be 'myCar' with 'red' and 'Toyota'.

• Classes can inherit properties and methods from...read more
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Q3. What is overriding in Java
Ans. 
Overriding in Java allows a subclass to provide a specific implementation of a method already defined in its superclass.
• Method overriding occurs when a subclass has a method with the same name and parameters as a method in its superclass.

• It enables runtime polymorphism, allowing the JVM to determine which method to execute at runtime.

• Example: If class A has a method 'void display()', and class B extends A and also has ...read more
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Q4. Difference between array and list
Ans. 
Arrays are fixed-size, homogeneous data structures; lists are dynamic, heterogeneous collections.
• Arrays have a fixed size, e.g., `String[] colors = {"Red", "Green", "Blue"};`.

• Lists can grow or shrink dynamically, e.g., `List<String> colors = new ArrayList<>();`.

• Arrays store elements of the same type, while lists can store different types.

• Accessing array elements is faster due to contiguous memory allocation...read more
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Q5. Tell me about your project
Ans. 
I worked on a renewable energy project focusing on solar panel efficiency improvements.
• Conducted research on different solar panel materials to enhance energy absorption.

• Designed a prototype using a combination of monocrystalline and polycrystalline panels.

• Performed simulations to analyze the performance under various weather conditions.

• Collaborated with a team to test the prototype in real-world scenarios, achieving a...read more
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Array and string coding

Q1. Questions were asked on projects
Ans. 
Discussed various projects showcasing skills in programming, teamwork, and problem-solving.
• Developed a web application using React and Node.js for a local business, improving their online presence.

• Collaborated with a team of 5 on a data analysis project, utilizing Python and SQL to derive insights from large datasets.

• Created a mobile app prototype for a health tracking system, focusing on user experience and interface ...read more
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Q2. Question on cpp, oops
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Q1. Why do you want to join Fidelity
Ans. 
I want to join Fidelity because of its reputation for innovation and commitment to employee development.
• Fidelity is known for its cutting-edge technology and forward-thinking approach

• I am impressed by Fidelity's focus on continuous learning and career growth opportunities

• I believe Fidelity's values align with my own, particularly in terms of integrity and excellence
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Q2. Give an example when you faced a conflict
Ans. 
During a group project, I had a conflict with a team member over the direction of our presentation.
• Team member wanted to focus on one aspect while I wanted to highlight another

• We discussed our viewpoints and compromised on a balanced approach

• Resulted in a successful presentation that covered all important aspects
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Q1. Find the character with the maximum frequency
Ans. 
Iterate through each character in the array of strings and keep track of the frequency of each character. Return the character with the maximum frequency.
• Create a dictionary to store the frequency of each character

• Iterate through each string in the array and then through each character in the string

• Update the frequency count of each character in the dictionary

• Return the character with the maximum frequency
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Q2. Valid parenthesis
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Q1. Have you used Junit? What is the difference between SQl and NoSQl Databases? have you worked with Kafka? Kafka based questions. explain dockerization/ containerization. which java8 feature did you work wit...read more
Ans. 
Yes, I have experience with Junit, SQL and NoSQL databases, Kafka, Dockerization, Java 8 features, stream() operations, and shell scripting in Unix.
• I have used Junit for unit testing in Java projects.

• SQL databases are relational databases that use structured query language for data manipulation, while NoSQL databases are non-relational databases that provide flexible schema design and horizontal scalability.

• I have work...read more
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Q1. What is the most complex sql query you have written till date. Why did you use nested query to achieve your goal? explain the query. which join did you use in the query. have you implemented hashset? how w...read more
Ans. 
The most complex SQL query involved nested queries for data manipulation. Used inner join. Implemented hashset and avoided trees due to their drawbacks.
• Nested SQL query used for complex data manipulation

• Inner join used for combining data from multiple tables

• Implemented hashset for efficient data storage and retrieval

• Avoided trees due to their drawbacks such as unbalanced structure and slower traversal times
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Q2. Find and replace words in a file using shell scripting. add an index in the beginning of each line in a file using shell scripting. what is multithreading? difference between single threaded and multithrea...read more
Ans. 
Shell scripting for find and replace, adding index to lines, multithreading, hashmap vs hashtable, stack vs queue
• Use sed command for find and replace in shell scripting

• Use awk command to add an index at the beginning of each line in a file

• Multithreading is the ability of a CPU to execute multiple threads concurrently

• Single threaded means only one thread is executed at a time, while multithreaded allows multiple threads...read more
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Q1. Behavioral questions- tell me about yourself. do you have any questions for us?
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