Corestrat Labs Senior Software Developer Interview Questions and Answers

Q1. Technical questions asked
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Q2. Coding questions
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Q1. Technical questions
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Q1. Salary discussion
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Q1. Introduced yourself?
Ans. 
I am a Senior Software Developer with 8 years of experience in full-stack development, specializing in Java and Angular.
• 8 years of experience in full-stack development

• Specialize in Java and Angular

• Strong problem-solving skills

• Experience with Agile methodologies

• Excellent communication and teamwork abilities
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Q2. What is the use of the yield() method in threading?
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The yield() method in threading is used to give up the CPU and allow other threads to run.
• Allows other threads to run by giving up the CPU temporarily

• Useful for preventing one thread from dominating the CPU

• Can be used to implement cooperative multitasking
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Q3. What is hash collision and how it can be handled?
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Hash collision occurs when two different inputs produce the same hash value. It can be handled by using techniques like chaining or open addressing.
• Hash collision is a common issue in hash tables where different keys produce the same hash value.

• One way to handle hash collisions is by using chaining, where each bucket in the hash table stores a linked list of key-value pairs with the same hash value.

• Another way to handl...read more
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Q4. What is use of Method reference instead lambada expressions in java 8?
Ans. 
Method references provide a more concise way to refer to methods by name instead of using lambda expressions.
• Method references can make code more readable and maintainable by reducing boilerplate code.

• They can be used to refer to static methods, instance methods, and constructors.

• Example: list.forEach(System.out::println) is equivalent to list.forEach(item -> System.out.println(item)).
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Q5. What is vertical and horizontal scaling in micro services?
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Vertical scaling increases the capacity of a single server, while horizontal scaling adds more servers to distribute the load.
• Vertical scaling involves increasing the resources of a single server, such as CPU, RAM, or storage.

• Horizontal scaling involves adding more servers to distribute the load, often done through containerization or virtualization.

• Vertical scaling is limited by the capacity of a single server, while ...read more
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Q6. Write a java program to make upper case of first letter in the each word in the below String "i am a java programmer"?
Ans. 
Java program to capitalize first letter of each word in a given string
• Split the input string by space to get individual words

• Iterate through each word and capitalize the first letter

• Join the words back together to form the final capitalized string
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Q1. How the escalation matrix works in case of production defects?
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Escalation matrix defines the process for escalating production defects based on severity and impact.
• Escalation matrix typically includes levels of escalation, responsible parties at each level, and criteria for escalating defects.

• For example, a Level 1 escalation may involve the development team, while a Level 2 escalation may involve senior management.

• Criteria for escalation may include severity of the defect, impact...read more
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Q2. What is your recent challenging task you have done in current project?
Ans. 
Implemented a real-time data synchronization feature between multiple servers.
• Designed a custom protocol for efficient data transfer

• Implemented server-side logic to handle data conflicts

• Utilized websockets for real-time communication
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Q3. Can you have ability to handle tasks individually?
Ans. 
Yes, I have the ability to handle tasks individually.
• I have a proven track record of successfully completing projects on my own.

• I am self-motivated and can prioritize tasks effectively.

• I have strong problem-solving skills which allow me to tackle challenges independently.
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Q4. Is it okay to give the Deliverables under pressure?
Ans. 
Yes, it is okay to give deliverables under pressure as long as quality is not compromised.
• Meeting deadlines is important in software development.

• Pressure can sometimes lead to increased focus and productivity.

• Communication with stakeholders about realistic timelines is key.

• Prioritizing tasks and managing time effectively can help in delivering under pressure.
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Q1. Introduce yourself?
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I am a Senior Software Developer with 8 years of experience in developing web applications using various technologies.
• Experienced in full stack development

• Proficient in languages like Java, JavaScript, and Python

• Skilled in using frameworks like Spring, React, and Django

• Strong understanding of database management systems

• Familiar with Agile development methodologies
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Q2. Why your leaving current company?
Ans. 
Seeking new challenges and growth opportunities.
• Desire for career advancement

• Looking for new challenges

• Seeking better work-life balance

• Company restructuring or changes in management
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Q3. What is your current CTC and expected CTC?
Ans. 
My current CTC is $100,000 and my expected CTC is $120,000.
• Current CTC: $100,000

• Expected CTC: $120,000
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Q4. Do you have all the relevant documents of previous companies?
Ans. 
Yes, I have all relevant documents from previous companies.
• I have copies of offer letters, employment contracts, and performance reviews.

• I also have any relevant certifications or training records.

• I can provide references from previous employers if needed.
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Q1. Streams and all features of Java 8
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Java 8 introduced Streams API for processing collections of data in a functional style.
• Streams provide a way to work with sequences of elements in a declarative manner.

• Features include map, filter, reduce, and collect operations.

• Streams can be parallelized to improve performance.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Stream<String> stream = names.stream();

• Example: int sum = ...read more
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Q2. Basic questions for Spring Boot, like annotation and one question on inner join
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Full stack developer

Q1. Sql performance optimication how to deal
Ans. 
SQL performance optimization involves indexing, query optimization, and database design improvements.
• Use indexes on frequently queried columns to speed up search operations.

• Optimize queries by avoiding unnecessary joins, using appropriate data types, and limiting the number of rows returned.

• Consider denormalizing the database schema for better performance in read-heavy applications.

• Regularly monitor and analyze query p...read more
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Q2. Al tools can be used in net how
Ans. 
Various tools like Visual Studio, ReSharper, Git, and Jira can be used in .NET development.
• Visual Studio is a popular IDE for .NET development

• ReSharper is a code analysis tool that can be used with Visual Studio

• Git is a version control system commonly used in .NET projects

• Jira is a project management tool that can be integrated with .NET development workflows
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Q1. Communication between microservices
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Communication between microservices is typically done through APIs, message queues, or event-driven architecture.
• Use RESTful APIs for synchronous communication between microservices

• Implement message queues like RabbitMQ or Kafka for asynchronous communication

• Utilize event-driven architecture with tools like Apache Kafka or AWS SNS/SQS

• Consider gRPC for high-performance communication between microservices
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Q2. Collectionin java
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Q1. How you will takle esculation
Ans. 
I will tackle escalations by first understanding the issue, prioritizing tasks, communicating effectively, and seeking help from senior team members if needed.
• Understand the root cause of the escalation

• Prioritize tasks based on urgency and impact

• Communicate effectively with stakeholders

• Seek help from senior team members if needed
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Q1. Redux and hooks concepts
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Q2. Html5 and css3 concepts
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Q1. Azile methodology and javascript and react advanced concepts
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Q1. Do you know microfrontend
Ans. 
Microfrontend is a software architectural style where a frontend application is decomposed into smaller, more manageable pieces.
• Microfrontend allows teams to work on different parts of the frontend independently.

• Each microfrontend can be developed, tested, and deployed separately.

• Microfrontend architecture helps in scaling large frontend applications.

• Examples of microfrontend frameworks include single-spa, Webpack Modu
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Q2. How to setup env in angular app, pipes asynch pure impure, subject and subject behavior only theory
Ans. 
Setting up environment in Angular app, understanding pipes, async, pure/impure, Subject and BehaviorSubject in theory
• Setting up environment in Angular app involves configuring environment files for different environments like development, production, etc.

• Pipes in Angular are used for transforming data in templates. Async pipes are used for handling asynchronous data streams.

• Pure pipes are stateless and only recompute w...read more
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Q1. What is MVC and explain how it works?
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MVC stands for Model-View-Controller, a software design pattern that separates the application into three main components.
• Model: Represents the data and business logic of the application.

• View: Represents the UI components of the application.

• Controller: Acts as an intermediary between Model and View, handling user input and updating the Model accordingly.

• MVC helps in organizing code, improving maintainability, and promo...read more
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Q2. What is Index Fragmentation in SQL
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Index fragmentation in SQL occurs when the logical order of pages in an index does not match the physical order in the data file.
• Index fragmentation can lead to decreased query performance as the database engine has to scan more pages to retrieve data.

• Fragmentation can be caused by frequent insertions, deletions, or updates on the indexed columns.

• Rebuilding or reorganizing indexes can help reduce fragmentation and impr...read more
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Q3. Explain about myself
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Q1. About My Company and Project
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Q2. Asked to write SQL query to find the 2nd highest salary of an employee
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