Tavant Technologies Interview Questions and Answers

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

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

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

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.

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

The content-type for attaching a file in a post request is 'multipart/form-data'.

• The content-type 'multipart/form-data' is used when submitting forms that contain files.

• It allows multiple parts to be combined into a single body, each part representing a different form field or file.

• The 'Content-Disposition' header is used to specify the name of the file being uploaded.

To navigate between different windows in Selenium code, use getWindowHandles() to get all window handles and switchTo() to switch between them.

• Use getWindowHandles() to get all window handles

• Use switchTo() to switch between windows

• Example: Set<String> windowHandles = driver.getWindowHandles(); driver.switchTo().window(windowHandles.toArray()[1]);