Who has a higher job potential - A data scientist or a software engineer?

Is it easy to find a job as a software engineer in Germany? What's the average salary?

Should other languages have short circuit operators like JavaScript's OR and AND?

How often do you backup your production database instances?

What should a Node.js developer know about core Node.js features?

A NodeJS developer today starts with frameworks like ExpressJS, etc. They hardly have any idea about code features of NodeJS. Are there any must-know features like EventEmitter, files, stream?