BrowserStack | SDE 2 | Screening round

Screening Round [R1]

Questions:

• Started with Introduction and then asked about the projects, to explain high level design of it.
• How does the current tech-stack fit the requirements of the XYZ project from your resume? / Which tech stack you would choose to build the XYZ project.
• Heavy Grilling based on the projects.
• RabbitMQ vs Redis Queue.
• Why MongoDB? Why not PostgreSQL or SQL?
• Questions on JS, Node.js, Express.js:
  • Event Loop.
  • Difference between setTimeout and setInterval.
  • Question on a snippet of code in JS.
  • Where is the image source stored? <img> tag src="".
  • How does the browser download the images? = as batches of 6 to 10 images.
• What happens when you enter a URL in the browser?
  • Expects answer in detail.
  • TCP/IP protocol.
  • 3-way Handshake.
  • Ports for HTTPS: 443 and HTTP: 80.

Simple Problem at the end: Given two huge values as a String and you need to perform an Arithmetic operation:

Function perform(String a, String b, String action)

In an Integer, the max value that you can store is 9999 (4 digits).

Test cases:

• num1 = "12345678"

• num2 = "99999999"

• action = "compare"

• num1 = "12349999"

• num2 = "99991111"

BF: to go digit by digit.
To optimize, we go by chunk by chunk of size 4.
Solution: a + b <= maxValue(9999) => a <= maxValue(9999) - b.