63 Moons Technologies Senior Software Developer Interview Questions and Answers

Some questions about specific puthon types etc...

Q1. Why i want to move on
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Q2. What i like at my future job
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MCQs and coding problems
duration - 1Hr 30min

Q1. Which 2 methods must an object implement in order to be used as a key in hasmap and why
Ans. 
The object must implement the hashCode() and equals() methods to be used as a key in a hashmap.
• hashCode() method is used to generate a unique hash code for the object.

• equals() method is used to compare two objects for equality.

• Both methods are necessary for proper functioning of hashmap operations like put() and get().
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Q2. Is it preferable to use stringBuffer with its synchronized methods or stringBuilder when implementing toString() method? why?
Ans. 
Use stringBuilder for toString() method as it is faster and not thread-safe.
• stringBuilder is faster than stringBuffer as it is not thread-safe

• toString() method is used for converting an object to a string

• If thread-safety is required, use stringBuffer instead

• Example: StringBuilder sb = new StringBuilder(); sb.append("Hello"); sb.append("World"); return sb.toString();
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Q3. What are 2 checklists to be executed for overriding object.equals(object args) for a class with only one instance variable
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Q4. Is it good idea to wrap java.io.FileInputStream and java.io.FileOutputStream in buffered writers and readers and why?
Ans. 
Yes, it is a good idea to wrap FileInputStream and FileOutputStream in buffered writers and readers.
• Buffered streams improve performance by reducing the number of I/O operations

• Buffered streams also provide additional functionality like readLine() and newLine()

• Buffered streams can be chained together for even better performance

• Example: BufferedReader br = new BufferedReader(new FileReader(file));
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I was given a problem statement and was asked to give a LLD and solution implementation and share it on Git.

Q1. Explain the LLD submitted.
Ans. 
The LLD submitted is a detailed design document outlining the architecture and implementation details of the software solution.
• LLD stands for Low Level Design and includes detailed design diagrams, data structures, algorithms, and component interactions.

• The LLD submitted should provide a clear roadmap for developers to implement the software solution based on the high-level design.

• It should cover all aspects of the sof...read more
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Q2. How to add more features in the solution
Ans. 
To add more features in the solution, consider user feedback, market trends, and technical feasibility.
• Gather user feedback to understand what features are desired

• Research market trends to identify popular features

• Assess technical feasibility to determine if new features can be implemented

• Prioritize features based on impact and resources available
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Q3. SOLID principles, Degin patterns
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Q1. This was a manegerial round.
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Q1. Salary discussion
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One mcq two codes in total 240 min

Q1. Mostly on networking concepts
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Q1. Coding question on data structures and algorithms
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Q1. What has been your greatest contributions in your previous Organizations
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Q2. How can you contribute to the Company Growth
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Q3. What Challenges you faced and how did you tackle them
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Q1. Describe any Situation which showcases your leadership and team building skills
Ans. 
Led a team to successfully implement a new software feature under tight deadline
• Assigned clear roles and responsibilities to team members

• Held regular team meetings to track progress and address any issues

• Encouraged collaboration and communication among team members

• Provided support and guidance to team members when needed
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Q2. Given a choice what other areas or skills you would like to work on
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Q3. How would u approach to a noticed issue in your current project
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Q1. Introduce yourself
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment
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Q2. What is React and react native
Ans. 
React is a JavaScript library for building user interfaces, while React Native is a framework for building mobile applications using React.
• React is a JavaScript library developed by Facebook for building interactive user interfaces.

• React Native is a framework that allows developers to build mobile applications using React.

• React uses a virtual DOM to improve performance by updating only the necessary components.

• React Na...read more
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Dataweave logic questions

Q1. Basic HR questions
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Q2. Prepare basic interview answers
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They have asked me to made one application.

Q1. Interview went for around 45 to 60mins regarding technical things in Android development,which includes kotlin couroutines,data manipulation,data storage etc in depth.
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Q1. This was my final round with Manager regarding my past projects etc
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Q1. Salary discussion
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