Techtree It Systems Interview Questions, Process, and Tips

Q1. First question he ask me to write spring boot application with controller, repo and service class to retrive all employee details.
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Q2. After that mid level sql query related to my current project
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Q3. Where do you setup transaction managment in spring boot project
Ans. 
Transaction management can be set up in Spring Boot project using @Transactional annotation.
• Use @Transactional annotation on methods that require transaction management

• Configure transaction manager bean in application context

• Use @EnableTransactionManagement annotation on configuration class

• Specify transaction attributes such as isolation level and propagation behavior

• Example: @Transactional(propagation = Propagation.RE...read more
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Q4. How to setup payment gateway for paypal in spring boot
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To setup payment gateway for PayPal in Spring Boot, you need to integrate PayPal SDK and configure the necessary properties.
• Add PayPal SDK dependency in pom.xml

• Configure PayPal properties in application.properties

• Implement PayPal payment service

• Integrate PayPal payment service with your application

• Test the payment flow
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Q5. @springBootApplication, @RestController, Concurrent Modification Exception, how to avoid this exception if we are using list interface.
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Q6. Different Http error code explanation like 422,304. sql procedure and function, how to write custom exception.
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Q7. Servlet related questions
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Q8. Write sql and hql custom query in spring boot application
Ans. 
Answer on how to write SQL and HQL custom queries in Spring Boot application
• To write SQL queries in Spring Boot, use JdbcTemplate or NamedParameterJdbcTemplate

• To write HQL queries, use Hibernate's SessionFactory and Query objects

• Example: JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource); String sql = "SELECT * FROM table WHERE column = ?"; List results = jdbcTemplate.query(sql, new Object[] { value });

• Example: S...read more
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Q1. Would you like join immediately?
Ans. 
Yes, I am available to join immediately.
• I am excited about the opportunity and ready to start right away.

• I have completed all necessary preparations to transition smoothly into the role.

• I am eager to contribute to the team and start making an impact.

• I have no prior commitments that would prevent me from joining immediately.
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Q2. Are you ready to relocate to Belgaum?
Ans. 
Yes, I am open to relocating to Belgaum for the Android Developer position.
• I am willing to relocate for the right opportunity

• I have experience adapting to new environments

• Belgaum offers a great opportunity for growth in the tech industry
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Q1. Are you familiar with android?
Ans. 
Yes, I am familiar with Android development and have experience in creating mobile applications for the platform.
• Experienced in developing Android applications using Java or Kotlin

• Knowledge of Android SDK, Android Studio, and different versions of Android OS

• Familiar with RESTful APIs, JSON, and third-party libraries like Retrofit and Glide
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Q2. Briefly explan your projects.
Ans. 
I have worked on various Android projects including e-commerce apps, social networking apps, and productivity tools.
• Developed an e-commerce app with payment gateway integration

• Created a social networking app with real-time messaging features

• Designed a productivity tool for task management and collaboration
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Q3. Questions on Oops concepts in java
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Moderate level...............

Q1. Modelling,er diagram
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Q2. Queries like duplicate, join
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Q1. What is DNS server.
Ans. 
DNS server is a system that translates domain names into IP addresses to enable communication over the internet.
• DNS servers store a database of domain names and their corresponding IP addresses.

• They help in resolving domain names to IP addresses for internet communication.

• DNS servers use a hierarchical system to distribute the workload and improve efficiency.

• Examples of popular DNS servers include Google DNS, OpenDNS,
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