40+ 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

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.

SQL injections using plain text query can be of various types.

• Union-based SQL injection

• Error-based SQL injection

• Boolean-based SQL injection

• Time-based SQL injection

• Out-of-band SQL injection

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

An abstract class can have both abstract and non-abstract methods, while an interface can only have abstract methods.

• An abstract class can have constructors, while an interface cannot.

• A class can implement multiple interfaces, but can only inherit from one abstract class.

• An abstract class can have instance variables, while an interface cannot.

• An abstract class can provide default implementations for some methods, while an interface cannot.

• An abstract class is used when a comm...read more

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

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

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

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.

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.

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

Lazy loading defers loading of non-critical resources until needed, while eager loading loads all resources upfront.

• Lazy loading improves initial page load time and reduces unnecessary resource usage.

• Eager loading is useful for small applications or when all resources are critical.

• Examples of lazy loading include images, videos, and large data sets.

• Examples of eager loading include small CSS and JavaScript files.

Monkey patching is a technique in programming where existing code is modified at runtime.

• Monkey patching involves modifying or extending the behavior of a class or module at runtime.

• It is often used in testing or debugging scenarios to temporarily change the behavior of a piece of code.

• Monkey patching can be done in languages like Python by directly modifying the class or module, or using libraries like 'mock'.

Link list implementation

• A linked list is a data structure where each element points to the next one

• It consists of nodes that contain data and a pointer to the next node

• Insertion and deletion are efficient, but random access is not

• Examples include singly linked list, doubly linked list, and circular linked list

Design a distributed system for generating tiny URLs

• Use a distributed key-value store to store mappings of short URLs to original URLs

• Implement a service that generates unique short URLs and stores them in the key-value store

• Use a load balancer to distribute requests to multiple instances of the service for scalability

• Consider using consistent hashing to evenly distribute the load across nodes in the system

Code to check if two strings are anagrams

• Create a function that takes in two strings as input

• Remove all spaces and convert both strings to lowercase

• Sort the characters in both strings and compare if they are equal

Netflix uses a microservices architecture to handle its large scale and complex system.

• Netflix uses a microservices architecture to break down its system into smaller, more manageable services.

• Each service is responsible for a specific function, such as recommendation algorithms or user authentication.

• This architecture allows for easier scalability and flexibility, as each service can be developed, deployed, and scaled independently.

• Netflix also utilizes cloud computing servi...read more

A linked list is a data structure that consists of a sequence of nodes, each pointing to the next node.

• Create a struct for the node with data and a pointer to the next node

• Create a head pointer to the first node

• Use malloc to allocate memory for new nodes

• Traverse the list using a while loop and the next pointer

• Free memory when deleting nodes

A binary search tree is a data structure where each node has at most two children, with the left child being less than the parent and the right child being greater.

• Nodes have a key value and pointers to left and right children.

• Insertion, deletion, and search operations are efficient due to the binary search property.

• In-order traversal of a binary search tree results in a sorted list of elements.

The question is about a hard DSA problem from LeetCode.

• Understand the problem statement thoroughly before starting to code.

• Break down the problem into smaller subproblems if possible.

• Use efficient data structures and algorithms to optimize the solution.

• Test your solution with different test cases to ensure correctness.

• Consider edge cases and handle them appropriately.

MapReduce is a programming model used in Hadoop for processing large datasets in parallel.

• MapReduce breaks down a big data processing task into smaller chunks that can be processed in parallel.

• The 'map' phase processes input data and produces key-value pairs.

• The 'reduce' phase aggregates the key-value pairs generated by the map phase.

• MapReduce is fault-tolerant and scalable, making it ideal for processing large datasets efficiently.

• Example: Counting the frequency of words in ...read more

To find the shortest cycle in a graph, we can use algorithms like Floyd's Tortoise and Hare algorithm or Breadth-First Search.

• Use Floyd's Tortoise and Hare algorithm to detect a cycle in the graph and then find the shortest cycle.

• Alternatively, use Breadth-First Search (BFS) to find the shortest cycle in an undirected graph.

• Consider the weight of edges if the graph is weighted, as it may affect the shortest cycle length.

Multithreading can be used to process large files efficiently by dividing the work among multiple threads.

• Divide the file into smaller chunks and assign each chunk to a separate thread for processing.

• Use synchronization techniques to ensure data integrity and avoid race conditions.

• Consider using a thread pool to manage the creation and execution of threads efficiently.

• Example: Reading a large CSV file and processing each row in parallel using multiple threads.

Hashmap is a data structure that stores key-value pairs and uses hashing to locate values based on their keys.

• Hashmap uses an array to store the key-value pairs

• The key is hashed to generate an index in the array

• If two keys hash to the same index, a collision occurs and the values are stored in a linked list

• Hashmap provides constant time complexity for insertion, deletion, and retrieval of values

Find the largest subsequence in an array of strings.

• Iterate through each string in the array and find the longest common subsequence among them.

• Use dynamic programming to efficiently find the longest common subsequence.

• Return the largest subsequence found.

Finding the second maximum value in an array of strings.

• Convert the strings to integers for comparison.

• Sort the array in descending order and return the second element.

• Handle cases where there may be duplicates of the maximum value.

Design LRU cache

• LRU cache stands for Least Recently Used cache

• It is used to store a limited number of items and remove the least recently used item when the cache is full

• It should support two operations: get(key) and put(key, value)

• get(key) should return the value associated with the key if it exists in the cache, else return null

• put(key, value) should insert or update the value associated with the key in the cache

• If the cache is full, the least recently used item should be r...read more

AWS offers a wide range of services including computing, storage, databases, machine learning, and more.

• Compute services (EC2, Lambda)

• Storage services (S3, EBS)

• Database services (RDS, DynamoDB)

• Machine learning services (SageMaker)

• Networking services (VPC, Route 53)

• Security services (IAM, KMS)

Rain water can be collected using various methods for household or agricultural purposes.

• Install rain barrels to collect rain water from gutters

• Set up a rain garden to allow rain water to seep into the ground

• Use a rainwater harvesting system to collect and store rain water for later use

I have 5 years of marketing experience in the tech industry, focusing on digital marketing strategies and campaign management.

• Developed and executed digital marketing campaigns to increase brand awareness and drive lead generation

• Utilized social media platforms to engage with target audience and promote products/services

• Analyzed market trends and competitor strategies to identify opportunities for growth

• Collaborated with cross-functional teams to ensure marketing initiatives ...read more