café Coffee day Senior Software Engineer Interview Questions and Answers

There were 3 coding questions totally based on dsa- hard

Q1. Vertical Traversal
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Q2. Find the node with shortest distance
Ans. 
Use Dijkstra's algorithm to find the node with the shortest distance in a graph.
• Implement Dijkstra's algorithm to calculate the shortest distance from a starting node to all other nodes in the graph.

• Select the node with the smallest distance that has not been visited yet as the current node.

• Update the distances of neighboring nodes from the current node if the new distance is smaller than the previously recorded distan...read more
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Q1. Question based on oops
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Q2. Question based on OS
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Q1. Software development lifecycle
Ans. 
Software development lifecycle is a process of planning, designing, developing, testing, deploying, and maintaining software.
• It involves various stages such as planning, analysis, design, implementation, testing, deployment, and maintenance.

• Each stage has its own set of activities and deliverables.

• It helps in ensuring that the software is developed efficiently and meets the requirements of the stakeholders.

• It also help...read more
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Q2. App security & deployment in play store
Ans. 
App security is crucial for deployment in Play Store. Follow best practices to ensure secure deployment.
• Use HTTPS for all network communication

• Implement secure authentication and authorization mechanisms

• Regularly update and patch the app to fix security vulnerabilities

• Use code obfuscation and encryption to protect against reverse engineering

• Conduct regular security audits and penetration testing

• Follow Google Play Store
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Math Reasoning, Probability, Graph and pie charts, Indices, Trignometry, Geometry

Verbal communication and english speaking, grammer,

Q1. How to refresh access token if an api fails due to it
Ans. 
Refresh the access token by making a request to the authentication server
• Check the response code of the API call to determine if it's due to an expired access token

• If the response code indicates token expiration, make a request to the authentication server to get a new access token

• Update the access token in the application's authentication header and retry the failed API call
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DSA , medium n easy leetcode question was there

Q1. Low level design
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Q2. DSA and computer fundamental
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Q1. What if auth token expires during a call. How do we retry?
Ans. 
Retry the call with a new auth token
• Check if the auth token has expired during the call

• Generate a new auth token

• Retry the call with the new auth token
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Q2. We use authenticator for it. It is provided by retrofit
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DSA questions:
1. Replace array of 1s and 0s with 0s in all rows and cols
2. Kandane's algo question

Q1. What is db cluster
Ans. 
A db cluster is a group of databases that work together to provide high availability and scalability.
• Consists of multiple database instances working together

• Provides redundancy and fault tolerance

• Allows for load balancing and scaling

• Examples: Amazon Aurora, Google Cloud Spanner
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Q2. Java collections, filters vs interceptors
Ans. 
Filters and interceptors are used in Java collections to manipulate or control the flow of data.
• Filters are used to selectively include or exclude elements from a collection based on certain criteria.

• Interceptors are used to perform actions before or after certain operations on a collection.

• Examples: Java 8 Stream API filters, Servlet filters for HTTP requests, Hibernate interceptors for database operations.
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Q1. How to refresh access token if an api fails due to it
Ans. 
Refresh the access token by making a request to the authentication server
• Check the response code of the API call to determine if it's due to an expired access token

• If the response code indicates token expiration, make a request to the authentication server to get a new access token

• Update the access token in the application's authentication header and retry the failed API call
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