VELOTIO Technologies Backend Software Developer Interview Questions and Answers

Printing matrix in spiral form and left+right view of tree

• For matrix, use four pointers to traverse in spiral form

• For tree, use recursion to traverse and print left and right view

• For left view, print the first node encountered in each level

• For right view, print the last node encountered in each level

Answering interview questions for software developer backend

• For School class, define properties like name, location, students, teachers, etc.

• For Instagram DB, define tables for users, posts, comments, likes, etc.

• Use relational database management system like MySQL or PostgreSQL.

• Implement proper indexing and normalization to optimize performance.

• Ensure data security and privacy by implementing authentication and authori...read more

Lazy loading is a technique used to defer the loading of non-critical resources until they are actually needed.

• It improves page load time and performance

• It reduces the initial load time of a web page

• It is commonly used for images, videos, and other media files

• It can be implemented using JavaScript or server-side programming

• Example: Images on a long-scrolling page are loaded only when they come into view