Experian Senior Security Engineer Interview Questions and Answers

Basic maths, quants and logic

Q1. Basic programs, bais Sql, basic C, C++, PLSQL, shell scripting
Add your answer

Online assessment and coding test

Q1. System Design related question to understand e2e picture of a working system in prod.
Add your answer
Q2. DS-Algo based question not remember now, but easy one
Add your answer

Q1. Prior project based System Design and questions around it
Add your answer
Q2. Design a custom data structure based on requirement
Ans. 
Custom data structure for array of strings
• Use a trie data structure to efficiently store and search for strings

• Implement methods for adding, removing, and searching for strings in the trie

• Consider optimizing the trie for memory usage and performance
Answered by AI
Add your answer
Q3. Internal working - of DB structures and indices etc
Ans. 
Understanding internal workings of DB structures and indices is crucial for optimizing database performance.
• DB structures refer to how data is organized within a database, such as tables, columns, and relationships.

• Indices are data structures that improve the speed of data retrieval operations by providing quick access to specific data values.

• Understanding how indices work can help in optimizing query performance by re...read more
Answered by AI
Add your answer

Q1. Past Experience based questions
Add your answer
Q2. Behavioral/Attitude observational Questions
Add your answer

DSA round on graph . String questions were asked

Q1. System design basics
Add your answer
Q2. Java 8 stream api code
Ans. 
Java 8 Stream API simplifies data processing with a functional approach, enabling operations on collections efficiently.
• Streams can be created from collections, arrays, or I/O channels. Example: List<String> names = Arrays.asList('Alice', 'Bob'); Stream<String> stream = names.stream();

• Common operations include filter, map, and reduce. Example: List<Integer> lengths = names.stream().map(String::length)...read more
Answered by AI
Add your answer
Q3. Current project
Add your answer

Q1. Only arrogance related stuff
Add your answer
Q2. Only arrogance related stuff happened
Add your answer

Q1. What are SSL certificates?
Ans. 
SSL certificates are digital certificates that authenticate the identity of a website and encrypt information sent to the server.
• SSL certificates ensure secure communication between a user's browser and a website's server.

• They use encryption to protect sensitive data such as login credentials, credit card information, etc.

• SSL certificates are issued by Certificate Authorities (CAs) and contain information about the web...read more
Answered by AI
Add your answer
Q2. What are the ways to secure REST API?
Ans. 
Securing REST API involves using authentication, authorization, encryption, and input validation.
• Use authentication methods like OAuth, JWT, or API keys to verify the identity of clients.

• Implement authorization to control access to resources based on user roles and permissions.

• Encrypt data transmission using HTTPS to protect sensitive information from being intercepted.

• Validate and sanitize input data to prevent inject...read more
Answered by AI
Add your answer
Q3. What if your application is down for 1 hour in one site in prod?
Ans. 
I would investigate the root cause, work on fixing the issue, and implement measures to prevent it from happening again.
• Investigate the root cause of the downtime, such as network issues, server failures, or software bugs

• Work on fixing the issue promptly to minimize impact on users and business operations

• Implement measures to prevent similar downtime in the future, such as redundancy, monitoring, and failover mechanism...read more
Answered by AI
Add your answer
Q4. How do you make sure a throttling system process dropped messages from a slow downstream service?
Ans. 
Implement a throttling system to handle dropped messages from a slow downstream service.
• Implement a queue to store messages from the downstream service.

• Set a maximum queue size and drop messages when the queue is full.

• Use a timestamp to track when messages were received and process them in order.

• Implement a retry mechanism to reprocess dropped messages after a certain time.

• Monitor the queue size and processing speed to...read more
Answered by AI
Add your answer

Q1. Micro services architecture
Add your answer

Q1. Java ,springboot
Add your answer

Q1. Springboot and java questions
Add your answer