Charles Schwab Senior Software Engineer Interview Questions and Answers

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. - Questions about my experience, skills, role and expectations,
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Q1. - Questions on Java, Spring boot and Memory optimization.
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Q1. - REST Architecture - How to compare two lists? - Git stash, checkout, commit and pull - Unit testing - SQL
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Q1. Tell about yourself
Ans. 
I am a Senior Software Engineer with 8 years of experience in developing scalable and efficient software solutions.
• Experienced in full stack development using technologies like Java, Spring Boot, Angular, and SQL

• Strong background in designing and implementing RESTful APIs

• Proficient in Agile methodologies and working in cross-functional teams

• Passionate about continuous learning and staying updated with the latest techno
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Q2. Your confidence level with Java
Ans. 
Highly confident in Java with 8+ years of experience in developing complex applications
• 8+ years of experience in Java development

• Proficient in Java programming language features and best practices

• Extensive experience in developing complex applications using Java

• Familiar with Java frameworks and libraries such as Spring, Hibernate, and Apache Commons

• Comfortable with multi-threading, performance optimization, and debuggi
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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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Haker rank test with basic java programming

Q1. Spring and jpa questions
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Q2. Basic string manipulation questions
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