Bluestock ™ Software Development Engineer 1 Interview Questions and Answers

3 dsa questions medium level

Q1. 2 medium level dp questions based on string and stocks
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Q2. One hard question based on graph
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Q1. Hr questions and java , springboot questions etc
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Three fundamental questions related to Data Structures and Algorithms.

Technical Aptitude on singalton pattern

Q1. What is man in middle attack?
Ans. 
A man-in-the-middle attack is a cyber security attack where the attacker secretly intercepts and possibly alters the communication between two parties.
• Attacker intercepts communication between two parties

• Attacker may alter the communication

• Commonly occurs in public Wi-Fi networks

• Can lead to data theft or unauthorized access
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Q2. How to protect api?
Ans. 
Protecting API involves using authentication, authorization, encryption, rate limiting, and monitoring.
• Implement authentication mechanisms such as OAuth, JWT, or API keys

• Use authorization to control access to different parts of the API

• Encrypt sensitive data using SSL/TLS

• Implement rate limiting to prevent abuse and protect against DDoS attacks

• Monitor API traffic for unusual activity and potential security threats
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Q3. Whats is csrf ?
Ans. 
CSRF stands for Cross-Site Request Forgery, a type of attack where a malicious website tricks a user into performing actions on another website without their knowledge.
• CSRF attacks exploit the trust that a site has in a user's browser, by sending unauthorized requests using the user's session.

• Prevent CSRF attacks by using tokens in forms, checking the origin of requests, and implementing proper authentication and autho...read more
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Q1. Why you want ti join airpay?
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Q2. Why you leave current organisation?
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Test was based on arrays and some dsa concepts.

Q1. Design and implement LRU cache?
Ans. 
LRU cache is a data structure that maintains the least recently used items in memory for efficient access.
• Use a combination of a doubly linked list and a hashmap to store and access the cache items.

• When a new item is accessed, move it to the front of the linked list to mark it as the most recently used.

• If the cache is full, remove the least recently used item from the end of the linked list and the hashmap.
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Coding and aptitude round

Q1. Tree dsa questions
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Q1. Horse race question
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Q1. Location specific question
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Q1. Projects, previous work , dsa and database
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Q1. System design , dsa
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Q1. Behavioural, system design
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Q1. General discussion , salary
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