10+ Senior Infra Developer Interview Questions and Answers

OOPS features and details of polymorphism overloading and overriding

• OOPS features include encapsulation, inheritance, and polymorphism

• Polymorphism allows objects to take on multiple forms

• Overloading is having multiple methods with the same name but different parameters

• Overriding is when a subclass provides its own implementation of a method from the superclass

• Example of polymorphism: a shape class with different subclasses for circle, square, and triangle

• Example of overloadin...read more

Program to reverse a string in Java

• Create a StringBuilder object

• Use the reverse() method of StringBuilder to reverse the string

• Convert the StringBuilder object back to a string using toString() method

To track down issues from web services, follow these steps.

• Check server logs for errors

• Use tools like Postman to test API endpoints

• Check network connectivity and firewall settings

• Monitor server performance and resource usage

• Collaborate with developers and stakeholders to identify and resolve issues

I know multiple programming languages including Java, Python, and C++. I am also proficient in Unix basic commands.

• Proficient in Java, Python, and C++

• Familiar with Unix basic commands such as ls, cd, mkdir, rm, etc.

• Able to navigate and manipulate files and directories in Unix environment

SQL is a language used to manage relational databases, while PL/SQL is a procedural language used to extend SQL functionality.

• SQL is used to manage and manipulate data in relational databases.

• PL/SQL is used to create stored procedures, functions, and triggers in Oracle databases.

• SQL is a declarative language, while PL/SQL is a procedural language.

• SQL is used to retrieve and manipulate data, while PL/SQL is used to create custom business logic.

• SQL is used in many different dat...read more

Class loaders are responsible for loading classes into the JVM. There are different types of class loaders.

• Bootstrap class loader - loads classes from the JDK's rt.jar file

• Extension class loader - loads classes from the JDK's extension directory

• System class loader - loads classes from the classpath

• Custom class loader - created by the developer to load classes from a specific location or source

• Class loaders follow a delegation model where they first delegate to their parent cl...read more

Ansible is an open-source automation tool used for configuration management, application deployment, and orchestration.

• Ansible uses YAML syntax for writing playbooks which define tasks to be executed on remote hosts.

• It connects to remote hosts via SSH and does not require any agent to be installed on the target machines.

• Ansible allows for idempotent execution, meaning running the same playbook multiple times will result in the same desired state.

• It has a large library of modu...read more

Image creation involves building a virtual representation of an operating system or application.

• Images can be created using tools like Dockerfile or Packer.

• Images can be customized with specific configurations and dependencies.

• Images can be stored in registries like Docker Hub or AWS ECR.

• Images can be used to create containers for running applications.

CI/CD process is a software development practice that involves continuous integration, continuous delivery, and continuous deployment.

• CI/CD stands for Continuous Integration/Continuous Delivery.

• It involves automating the process of integrating code changes into a shared repository and then deploying them to production.

• CI/CD helps in reducing manual errors, improving code quality, and increasing the speed of software delivery.

• Popular CI/CD tools include Jenkins, GitLab CI/CD, ...read more