Fidelity Investments Software Engineer Interview Questions, Process, and Tips

Q1. 1. What is difference between spring and spring boot? 2. Write code for singleton class in Java? 3. What is Marker interface? 4. What is concurrent hash map and how does it work? 5. How will you address pe...read more
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Sample interview questions for Software Engineer position
• Spring vs Spring Boot

• Singleton class in Java

• Marker interface

• Concurrent Hash Map

• Performance issues in SQL/Oracle

• Mapping in Hibernate ORM

• Spring Boot application execution

• Difference between PUT and POST methods

• Authentication in Java application

• Controller class structure in notepad

• Scope of Spring bean

• URL structure and parts

• Difference between Java and JavaScript

• Applic...read more
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Q1. What is GDP of the company? What are the latest features of Java 8? Write Java code snippet to count number of 1s, 2s, 3s in an array [1,2,2,3,3,4,4,1,2,3] Write functional programming code to iterate over...read more
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Interview questions for Software Engineer position
• GDP is not relevant to the Software Engineer position

• Java 8 features include lambda expressions, streams, and default methods

• Java code snippet: use a HashMap to count occurrences of each number

• Functional programming code: use forEach or map method to iterate over list
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Q1. Why you? What is your greatest weakness and what you do to it? When you are under extreme stress, what makes you focus your deliverables? Are you ok to relocate? Are you ok to commute long distances?
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Q1. Find the character with the maximum frequency
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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
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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
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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
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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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Hacker rank for 1 hr

Q1. Angular design pattern etc
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Asked how do you call an api in javascript and basic questions like output of 3 + "3" and 3 -"3"

2 java questions. 60mins time and easy to medium level

Q1. 30min interview on previous project, java basics , spring boot basics and tools you have mentioned CV
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Q1. How you take decisions in your current project? How are the apps architecture decided?
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Decisions in current project are made through team collaboration and considering project requirements. App architecture is decided based on scalability, performance, and maintainability.
• Decisions are made through team collaboration and discussions

• Consideration of project requirements and goals

• App architecture is decided based on scalability, performance, and maintainability

• Use of design patterns and best practices to g
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