Corecard Software Software Developer Interview Questions and Answers

Coding question on string manipulation like tell the type of card based on the string constraints of the given card number.

Screening round was a 1 hour coding test. Mostly non leetcode style where the question is incremental - Eg. Identify a pattern in a given text value and extract it then perform subsequent transformations. There is no right or wrong its just how well you are able to do the task.

Q1. Resume related system design deep dive
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Another round similar to the first one with an incremental coding test. Question was very lengthy.

Q1. SQL database and you need to find out what is wrong with the data
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Q1. Another coding round where you need to go clone a repo and extend an existing feature using the libraries in the documentation provided.
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It was 30 min coding test and question was from easy level DSA question

Q1. Difference between react and next
Ans. 
React is a JavaScript library for building user interfaces, while Next is a framework for building server-side rendered React applications.
• React is a JavaScript library for building user interfaces.

• Next is a framework for building server-side rendered React applications.

• Next provides features like server-side rendering, static site generation, and routing out of the box.
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Q2. What is Nodejs and its event loop
Ans. 
Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• The event loop is responsible for handling asynchronous operations in Node.js.

• Example: Reading a file asynchronously in Node.js using fs module.
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Machine coding.
Code structure, naming, best practices are more important than time or space complexity.

Same as Round 1, except more complex problem statement

Q1. Integration round. Given a library, do some operations with it, i.e. pull specific data point from file, make an POST call using different data point etc.
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Q1. Given a codebase, fix a specific bug
Ans. 
I would start by reproducing the bug, analyzing the code, identifying the root cause, implementing a fix, testing the fix, and finally deploying it.
• Reproduce the bug by following the steps that lead to the issue.

• Analyze the code surrounding the bug to understand the context and potential causes.

• Identify the root cause of the bug by debugging and tracing the code execution.

• Implement a fix by making the necessary code ch...read more
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Q1. Standard HLD/LLD design problem
Ans. 
HLD focuses on overall system architecture, while LLD delves into specific implementation details.
• HLD includes components, modules, interfaces, and dependencies.

• LLD involves detailed class diagrams, data structures, algorithms, and database schema.

• Example: HLD may outline a system using microservices architecture, while LLD may specify how each microservice communicates and stores data.
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LLD for load balancer

Q1. API integrations, integrate 3rd party API to visualize ride locations and generate images
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Solve a bug in JSON like parsing library

Implement the function "Printlast10lines" such that the program prints the last 10 (or less) in a given string

Q1. Delete nth node in a singe linked list
Ans. 
To delete the nth node in a single linked list, we need to find the (n-1)th node and update its next pointer.
• Traverse the linked list to find the (n-1)th node

• Update the next pointer of the (n-1)th node to skip the nth node

• Free the memory allocated to the nth node
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Q1. Concurrent modification exception Java multithreading java collection framework oops
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