Fidelity Investments Senior Engineering Manager Interview Questions and Answers

Few basics of java
Dsa question

Q1. Java multithreading questions
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Q2. Spring boot questions.
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Q1. Longest Increasing Subsequence
Ans. 
Find the length of the longest increasing subsequence in an array.
• Use dynamic programming to solve this problem efficiently.

• Iterate through the array and keep track of the longest increasing subsequence ending at each index.

• Example: For array [10, 22, 9, 33, 21, 50, 41, 60, 80], the longest increasing subsequence is [10, 22, 33, 50, 60, 80] with length 6.
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Q1. UseEffect polyfill
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Q1. Frequency of character in string
Ans. 
The question is asking about how to find the frequency of each character in a given string.
• Iterate through the string and count the occurrences of each character

• Store the counts in a data structure like a hashmap or array

• Return the counts for each character
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Q1. Reverse a string
Ans. 
Reverse a given string
• Create a new empty string to store the reversed string

• Iterate through the original string from end to start and append each character to the new string

• Return the reversed string
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Q1. Array related problem
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Q1. C# oops related deep question
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Q1. Project Design related questions
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Q1. SQL Linq mvc net core related questions
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Q1. Questions on spring boot
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Q2. Questions on Java
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Q3. Java 8 Stream APi
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Q4. Questions on previous projects
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Q1. Questions on jsp and unit tests
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Q2. How can millions of requests be effectively managed?
Ans. 
Millions of requests can be effectively managed through load balancing, caching, and scaling.
• Implementing load balancing to distribute requests evenly across multiple servers

• Utilizing caching mechanisms to store frequently accessed data and reduce response times

• Scaling infrastructure horizontally by adding more servers to handle increased traffic

• Using content delivery networks (CDNs) to cache and deliver content closer
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Kafka can be used as a solution.

Q1. Salary discussion
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Q2. Notice period negotiations
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