Hummingbird Web Solutions Backend Developer Interview Questions and Answers

Q1. Can you d3scribe a complex backend problem you faced and how you solved it?
Ans. 
Faced a challenge with database performance, optimized queries, and implemented caching to enhance response times significantly.
• Identified slow queries using profiling tools like EXPLAIN in SQL.

• Refactored complex joins into simpler queries to reduce execution time.

• Implemented Redis caching for frequently accessed data, reducing database load.

• Monitored performance metrics post-implementation to ensure improvements.
Answered by AI
Add your answer
Q2. How do you ensure the security and scalability of a backend system?
Ans. 
Ensuring backend security and scalability involves implementing best practices in architecture, coding, and infrastructure management.
• Implement authentication and authorization mechanisms (e.g., OAuth, JWT) to secure APIs.

• Use HTTPS to encrypt data in transit and protect against man-in-the-middle attacks.

• Regularly update dependencies and libraries to patch known vulnerabilities.

• Employ rate limiting and throttling to pre...read more
Answered by AI
Add your answer
Q3. How do you handle database optimization and performance issues in a large-scale application?
Ans. 
I optimize databases by analyzing queries, indexing, and using caching strategies to enhance performance in large-scale applications.
• Analyze slow queries using tools like EXPLAIN to identify bottlenecks.

• Implement indexing on frequently queried columns to speed up data retrieval.

• Use caching mechanisms (e.g., Redis, Memcached) to reduce database load.

• Partition large tables to improve query performance and manageability.

• O...read more
Answered by AI
Add your answer

Q1. How does database indexing improve query perfoemance?
Ans. 
Database indexing improves query performance by reducing the number of disk I/O operations needed to retrieve data.
• Indexing allows the database to quickly locate specific rows in a table, reducing the need to scan the entire table.

• Indexes can be created on columns frequently used in WHERE clauses or JOIN conditions.

• Examples of indexes include primary keys, unique constraints, and composite indexes.

• Proper indexing can s...read more
Answered by AI
Add your answer
Q2. It reduces search time by optimizing lookups.
Add your answer

Q1. What is the purpose of REST API in backend development?
Ans. 
REST API in backend development is used to allow communication between different systems over the internet.
• Allows for communication between different systems or services

• Follows a client-server architecture

• Uses standard HTTP methods like GET, POST, PUT, DELETE

• Supports multiple data formats like JSON, XML

• Stateless, meaning each request from a client must contain all the information needed to fulfill the request
Answered by AI
Add your answer
Q2. GET, POST, PUT and DELETE
Add your answer

Q1. "Tailor your resume to highlight role-specific achievements."
Add your answer
Q2. "Stay updated with industry trends and new technologies."
Add your answer

Q1. What is the difference between GET AND POST methods in HTTPS?
Ans. 
GET method is used to request data from a server, while POST method is used to submit data to a server in HTTPS.
• GET requests data from a specified resource, while POST submits data to be processed to a specified resource.

• GET requests can be cached and remain in the browser history, while POST requests are not cached and do not remain in the browser history.

• GET requests have length restrictions on the amount of data tha...read more
Answered by AI
Add your answer
Q2. GET is Retrieves and POST is Sends data.
Ans. 
GET is used to retrieve data from a server, while POST is used to send data to a server.
• GET requests are used to retrieve data from a specified resource. For example, fetching a list of products from an online store.

• POST requests are used to submit data to be processed by a server. For example, submitting a form with user information to create a new account.

• GET requests are idempotent, meaning they can be repeated mult...read more
Answered by AI
Add your answer

Q1. What is the MVC?
Ans. 
MVC is a software architectural pattern that separates an application into three interconnected components: Model, View, and Controller.
• Model: Represents the data and business logic. Example: A class that interacts with a database.

• View: Displays the data to the user. Example: HTML/CSS templates that render the user interface.

• Controller: Handles user input and updates the Model and View. Example: A REST API endpoint tha...read more
Answered by AI
Add your answer
Q2. What is JDBC and how connect the Database in Code?
Ans. 
JDBC (Java Database Connectivity) is an API for connecting and executing queries with databases in Java applications.
• JDBC provides a standard interface for connecting to various databases.

• To connect to a database, you need a JDBC driver specific to the database type.

• Example of loading a driver: Class.forName('com.mysql.cj.jdbc.Driver');

• Establish a connection using DriverManager: Connection conn = DriverManager.getConne...read more
Answered by AI
Add your answer

I have given the coding test in python language. Out of 5 questions, we have to attain a minimum of 3 questions.

Q1. The questions in technical round is related to the task which were given to us and also they ask basics questions related to technical.
Add your answer

Q1. The interview was about the personality check, overeally it was good .
Add your answer

Q1. Basic concepts of Promises
Add your answer
Q2. What is Hashing
Add your answer
Q3. Authentication and Validation
Add your answer