50+ SSE Interview Questions and Answers

Docker is a containerization platform that allows developers to package, deploy, and run applications in isolated environments.

• Basic commands include: docker run, docker build, docker push, docker pull, docker images, docker ps

• Docker allows for easy portability and scalability of applications

• Docker containers are lightweight and efficient, allowing for faster deployment times

• Docker Hub is a repository for storing and sharing Docker images

• Docker Compose is a tool for defining ...read more

Technical knowledge developers are essential for creating and maintaining complex software systems.

• Technical knowledge developers possess the skills and expertise necessary to design, develop, and implement software solutions.

• They are responsible for ensuring that software systems are efficient, reliable, and secure.

• They stay up-to-date with the latest technologies and programming languages to ensure that their skills remain relevant.

• Examples of technical knowledge developers...read more

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured templates and components.

• Spring Boot provides a set of pre-configured templates and components that can be used to quickly develop Java applications.

• It includes features like auto-configuration, embedded servers, and production-ready metrics.

• Spring Boot also integrates with other Spring frameworks like Spring Data and Spring Security.

• Some of the key components of Spring...read more

Hibernate is an ORM tool for Java that simplifies database access.

• Hibernate eliminates the need for writing complex SQL queries.

• It provides a simple API for performing CRUD operations on database tables.

• Hibernate supports caching, which improves application performance.

• It also supports lazy loading, which reduces the number of database queries.

• Hibernate is database independent, which means it can work with different databases.

• It provides support for transaction management and...read more

Sales analysis involves evaluating sales data to identify trends and opportunities for improvement.

• Conduct a thorough analysis of sales data to identify patterns and trends

• Set specific sales goals and targets for improvement

• Implement strategies such as targeted marketing campaigns or sales training programs

• Regularly monitor and track sales performance to measure progress

• Seek feedback from customers and sales team to identify areas for improvement

AWS SDK for Java provides APIs to connect with AWS services from Spring Boot application.

• Add AWS SDK for Java dependency in Spring Boot project

• Create an instance of AWS service client using AWS SDK for Java

• Use the client to interact with AWS services

• Configure AWS credentials and region in application.properties file

• Example: Connect to S3 bucket using AWS SDK for Java in Spring Boot

To create a thread safe singleton, use double-checked locking or static initialization.

• Use a private constructor to prevent direct instantiation.

• Create a private static instance of the class.

• Use double-checked locking or static initialization to ensure thread safety.

• Provide a public static method to access the instance.

Implementing a 'Close Friends' feature in a social media platform.

• Allow users to create a list of close friends to share exclusive content with

• Provide options for users to customize privacy settings for their close friends list

• Include a notification feature for when a user is added to someone else's close friends list

HOC, or Higher-Order Component, is a pattern in React for reusing component logic.

• HOCs are functions that take a component and return a new component.

• They are used for cross-cutting concerns like authentication, logging, etc.

• Example: A HOC that adds loading state to a component can be implemented as follows: `const withLoading = (WrappedComponent) => { ... }`.

• HOCs can enhance props, manage state, or handle side effects.

In my previous role, I encountered misinformation and learned to verify facts rigorously to ensure accuracy in my work.

• In a project, I was told that a certain library was deprecated, but it was still actively maintained.

• A colleague claimed that a specific algorithm was the best for our use case, but after research, I found a more efficient alternative.

• I once received a report stating that our server uptime was 99%, but upon checking logs, it was actually around 95%.

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope.

• Variables declared with var are hoisted to the top of their scope

• Function declarations are hoisted before variables

• Function expressions are not hoisted

• Hoisting can lead to unexpected behavior and bugs

Merge overlapping intervals in a list to create a consolidated list of intervals.

• Sort the intervals by their start time.

• Initialize an empty list to hold merged intervals.

• Iterate through the sorted intervals and merge them if they overlap.

• Example: Merging [[1,3],[2,6],[8,10],[15,18]] results in [[1,6],[8,10],[15,18]].

• Use a loop to compare the current interval with the last merged interval.

The @RestController annotation is used in Spring to indicate that a class is a RESTful controller.

• It is a specialized version of the @Controller annotation

• It is used to handle HTTP requests and return JSON/XML responses

• It eliminates the need for @ResponseBody annotation

• Example: @RestController @RequestMapping("/api") public class ApiController { }

HashMap is non-synchronized and allows null values, while HashTable is synchronized and doesn't allow null values.

• HashMap is faster than HashTable due to non-synchronization.

• HashMap allows null values for both key and value.

• HashTable doesn't allow null values for key or value.

• HashMap is preferred for single-threaded applications.

• HashTable is preferred for multi-threaded applications.

• Both use key-value pairs to store and retrieve data.

Query to delete duplicate rows in a table

• Use the DISTINCT keyword to select unique rows

• Use the GROUP BY clause to group the rows by columns

• Use the HAVING clause to filter out the duplicate rows

• Use the DELETE statement to delete the duplicate rows

Structural directives are Angular directives that modify the structure of the DOM by adding, removing, or manipulating elements.

• Structural directives are prefixed with an asterisk (*) in Angular templates.

• They are used to conditionally display or hide elements, repeat elements, or switch between views.

• Examples include *ngIf, *ngFor, and *ngSwitch.

String is immutable to ensure thread safety, security, and caching benefits.

• Immutable strings are thread-safe, as multiple threads can access the same string without any race conditions.

• Immutable strings are secure, as they cannot be modified by malicious code.

• Immutable strings can be cached, as their values never change, resulting in better performance.

• Examples of immutable strings in Java include String, Integer, and Boolean.

I am proficient in coding with experience in various programming languages and projects.

• Proficient in multiple programming languages such as Java, Python, and C++

• Experience in developing web applications using HTML, CSS, and JavaScript

• Completed coding projects involving data structures and algorithms

• Participated in coding competitions and hackathons

The project flow of the existing project involves multiple stages and processes to ensure successful completion.

• The project starts with the initiation phase where goals and objectives are defined.

• Next, the planning phase involves creating a detailed project plan outlining tasks, timelines, and resources.

• The execution phase involves carrying out the project plan and completing the tasks.

• During the monitoring and controlling phase, progress is tracked, and adjustments are made ...read more

Cookies are used to store user data and preferences on websites for a better browsing experience.

• Cookies help websites remember user login information

• They can also store user preferences such as language and currency settings

• Cookies are used for tracking user behavior and serving targeted ads

• They can also be used for website analytics to improve user experience

• Cookies can be both first-party (set by the website being visited) and third-party (set by other websites)

• Some cookie...read more

Liskov Substitution Principle (LSP) states that objects of a superclass should be able to be replaced with objects of its subclasses without affecting the correctness of the program.

• LSP is one of the SOLID principles of object-oriented programming.

• It ensures that the behavior of the program remains consistent when a subclass is used in place of a superclass.

• Violating LSP can lead to unexpected behavior and bugs in the program.

• For example, if a program expects a superclass obj...read more

Components are individual parts that make up a larger system or object.

• Components can be physical or digital.

• Examples of physical components include nuts and bolts in a machine.

• Examples of digital components include software modules in a computer program.

• Components work together to create a functioning whole.

• Components can be replaced or upgraded without replacing the entire system.

Understanding variadic functions and their matching mechanisms in programming.

• Variadic functions accept a variable number of arguments, e.g., 'printf' in C.

• In C, use '...' to define a variadic function: 'void func(int count, ...)'

• Access arguments using 'va_list', 'va_start', and 'va_end' macros.

• Example: 'printf("%d %s", 10, "hello");' matches 10 as int and 'hello' as string.

Bloom filters are space-efficient data structures used for quick membership queries.

• Space-efficient data structure

• Quick membership queries

• False positives possible

Classes in JavaScript are a way to create reusable code templates for objects.

• Classes are declared using the 'class' keyword.

• They can have constructors, methods, and properties.

• Instances of a class are created using the 'new' keyword.

• Classes can also be extended using the 'extends' keyword.

• Classes can be used to create objects with similar behavior and properties.

SOLID is a set of principles for object-oriented programming to make software more maintainable, scalable and robust.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes must be substitutable for their base types.

• I - Interface Segregation Principle: Clients should not be forced to depend on interfaces t...read more

Middlewares are software components that act as a bridge between different applications, allowing them to communicate and share data.

• Middlewares can handle requests and responses in web applications

• They can modify or enhance the functionality of an application without changing its core code

• Examples include authentication middleware, logging middleware, and error handling middleware