Tavant Technologies Technical Lead Interview Questions and Answers

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Q1. Basic project related technical question
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Q2. Basic technical questions
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Q1. Basic java technical questions
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Q1. Basic hr related questions
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Q2. Hr round was good
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Q1. Questions related to basic javascripts, react etc
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Q2. What is hoisting, closure, redux, why react, a coding questions on react to group array and object
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Q1. Basic js questions, react questions , coding questions to search text and listing result with images using redux, and crearing routing.
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Q1. Previous work related questions, how to list 3rd party ads in react app, knowledge about git environment etc.. overall he want to judge how techie you are with communication.
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Q1. Why Tavant, general introduction, salary discussion etc
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Q1. How you previously handling microservices deployment?
Ans. 
I have experience using containerization tools like Docker and Kubernetes for microservices deployment.
• I have used Docker to create container images for each microservice.

• I have used Kubernetes to manage the deployment, scaling, and load balancing of the microservices.

• I have also used Helm charts to package and deploy the microservices as a group.

• I have implemented CI/CD pipelines using tools like Jenkins or GitLab to ...read more
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Q2. Explain about design patterns you used ?
Ans. 
I have used various design patterns such as Singleton, Factory, Observer, and Decorator.
• Singleton pattern was used to ensure only one instance of a class is created.

• Factory pattern was used to create objects without exposing the instantiation logic to the client.

• Observer pattern was used to notify the dependent objects when there is a change in the state of an object.

• Decorator pattern was used to add new functionality ...read more
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Q3. Write own singleton class and secure it in multi threading environment?
Ans. 
A singleton class is a class that can only be instantiated once. It is important to secure it in a multi-threading environment.
• Create a private constructor to prevent external instantiation

• Create a private static instance of the class

• Create a public static method to return the instance

• Use synchronized keyword to ensure thread safety

• Consider using double-checked locking to improve performance
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Q4. Why string is immutable , is it possible to write our own immutable class?
Ans. 
String is immutable to ensure thread safety and security. Yes, we can write our own immutable class.
• String is immutable to prevent accidental modification of data.

• Immutable classes ensure thread safety and security.

• We can write our own immutable class by making all fields final and not providing any setters.

• Examples of immutable classes are String, Integer, and LocalDate.
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Q5. Write code to find repeated characters in string with count using java 8?
Ans. 
Code to find repeated characters in string with count using Java 8
• Convert string to char array

• Use streams to group by character and count

• Filter out characters with count less than 2

• Print the repeated characters with their count
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Q6. Get third highest salary in given employee list use java 8?
Ans. 
Get third highest salary in given employee list using Java 8
• Sort the employee list in descending order of salary using Comparator

• Use distinct() to remove duplicates

• Skip the first two highest salaries using skip()

• Use findFirst() to get the third highest salary
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Q7. Do you know difference between functional programming and object oriented programming?
Ans. 
Functional programming focuses on functions while object oriented programming focuses on objects and their interactions.
• Functional programming emphasizes immutability and avoids side effects.

• Object oriented programming uses classes and objects to encapsulate data and behavior.

• Functional programming languages include Haskell and Lisp while object oriented programming languages include Java and C++.

• Functional programming...read more
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Q1. In microservices environment , if we deploy in cloud for every instance port number always changing right . So, how you going to call your instance int his case ?
Ans. 
In a microservices environment, service discovery and load balancing are key to managing dynamic port assignments in cloud deployments.
• Use a service discovery tool like Consul or Eureka to register and discover services dynamically.

• Implement API Gateway patterns to route requests to the appropriate service instance without needing to know the port.

• Utilize container orchestration platforms like Kubernetes, which manage ...read more
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Q2. Have you configured saga design pattern in your project?
Ans. 
Yes, I have configured saga design pattern in my project.
• I have used saga design pattern to manage complex workflows and transactions.

• I have implemented sagas using libraries like Redux-Saga and NServiceBus.

• I have used sagas to handle scenarios like order processing, payment processing, and inventory management.

• I have also used sagas to handle compensating transactions in case of failures.
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Q3. How you securing your microservices?
Ans. 
We secure our microservices using a combination of authentication, authorization, encryption, and monitoring.
• We use OAuth2 for authentication and authorization.

• We encrypt sensitive data using AES-256 encryption.

• We use SSL/TLS for secure communication between microservices.

• We implement rate limiting to prevent DDoS attacks.

• We monitor our microservices using tools like Prometheus and Grafana.

• We perform regular security a...read more
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Q4. Have you involved in CI/CD process ?
Ans. 
Yes, I have extensive experience in implementing CI/CD pipelines.
• I have worked with tools like Jenkins, GitLab CI/CD, and Travis CI.

• I have automated build, test, and deployment processes for multiple projects.

• I have integrated code quality checks and security scans into the pipeline.

• I have also implemented blue-green and canary deployment strategies.

• Overall, I understand the importance of continuous integration and del...read more
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Q5. What is the real time scenario , where you are using the circuit breaker ?
Ans. 
Circuit breaker is used to prevent cascading failures in distributed systems.
• Circuit breaker is used to handle faults in microservices architecture.

• It is used to prevent overloading of a service by temporarily stopping requests to it.

• It helps in improving the resilience of the system by handling failures gracefully.

• Example: If a service is down, circuit breaker will stop sending requests to it and will try again after ...read more
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Q6. Do you know about orchestration and choreography design patterns?
Ans. 
Orchestration and choreography are design patterns used in distributed systems.
• Orchestration involves a central controller that coordinates the interactions between services.

• Choreography involves services communicating with each other directly without a central controller.

• Orchestration is more suitable for complex workflows while choreography is more flexible.

• Examples of orchestration tools include Kubernetes and Apach...read more
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Q7. How you implementing and validating the JWT token ?
Ans. 
JWT tokens are implemented and validated using a combination of server-side and client-side code.
• The server generates a JWT token and sends it to the client upon successful authentication.

• The client stores the token in local storage or a cookie.

• For each subsequent request, the client sends the token in the Authorization header.

• The server verifies the token's signature and expiration time before processing the request.

• I...read more
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Q8. Which one is best constructor injection or Setter injection?
Ans. 
Constructor injection is preferred over Setter injection.
• Constructor injection ensures that all required dependencies are provided at the time of object creation.

• Setter injection allows for optional dependencies and can be used for dynamic changes.

• Constructor injection is more secure as the object is fully initialized before use.

• Setter injection can lead to inconsistent object states if not used carefully.

• Constructor i...read more
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Q9. Why we need Autowire in Spring ?
Ans. 
Autowire simplifies dependency injection in Spring by automatically wiring beans together.
• Autowire eliminates the need for manual bean wiring in XML configuration files.

• It reduces the amount of boilerplate code needed to configure dependencies.

• Autowire can be used with different types of injection, such as constructor, setter, and field injection.

• Example: @Autowired private MyService myService; will automatically injec...read more
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Q10. Difference between @Configuration and @Component annotations?
Ans. 
Difference between @Configuration and @Component annotations
• The @Configuration annotation is used to define a configuration class that provides bean definitions

• The @Component annotation is used to mark a class as a Spring component

• Configuration classes can be imported into other configuration classes using @Import annotation

• Components can be scanned and automatically registered as beans using @ComponentScan annotation
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Q11. Can you tell me what are the design patterns you worked?
Ans. 
I have worked with various design patterns including MVC, Singleton, Factory, and Observer.
• MVC pattern for separating concerns in web applications

• Singleton pattern for ensuring only one instance of a class is created

• Factory pattern for creating objects without exposing the instantiation logic

• Observer pattern for implementing event-driven architectures
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