--- title: "RAUSHAN KUMAR (@codewithraushan) | Hashnode" description: "Senior Software Engineer at IDfy. Read the latest articles by RAUSHAN KUMAR on Hashnode." url: "https://hashnode.com/@codewithraushan" --- @codewithraushan # RAUSHAN KUMAR @codewithraushan · Bangalore · Joined February 2022 Senior Software Engineer at IDfy ### [Circuit Breaker : How to implement in Javascript](https://techwithraushan.hashnode.dev/circuit-breaker-how-to-implement-in-javascript?utm_source=hashnode&utm_medium=feed) What is circuit breaker? Circuit breaker is a design pattern. Than can prevent to getting down entire application due any single services down. In that circuit breaker concept we are continues monitoring the external dependecies and keeping tracking... 1 min read · [techwithraushan.hashnode.dev](https://techwithraushan.hashnode.dev/circuit-breaker-how-to-implement-in-javascript?utm_source=hashnode&utm_medium=feed) [Aug 25, 2025](https://hashnode.com/posts/circuit-breaker-how-to-implement-in-javascript/68ac918f10382d82b1669e50) ### [How to Send Bulk Emails Using Google Sheets and Apps Script Free (With Custom Message for Each Recipient)](https://tech-automation.hashnode.dev/send-bulk-emails-google-sheets-apps-script?utm_source=hashnode&utm_medium=feed) How to send bulk custom email free 3 min read · [tech-automation.hashnode.dev](https://tech-automation.hashnode.dev/send-bulk-emails-google-sheets-apps-script?utm_source=hashnode&utm_medium=feed) [Jul 6, 2025](https://hashnode.com/posts/send-bulk-emails-google-sheets-apps-script/686a3e2b763da556b7780337) ### [Why You Should Use Node.js for Web Crawling](https://scrapingpoint.hashnode.dev/why-you-should-use-nodejs-for-web-crawling?utm_source=hashnode&utm_medium=feed) Learn why Node.js is a powerful choice for web crawling : from async requests to headless browser automation. 4 min read · [scrapingpoint.hashnode.dev](https://scrapingpoint.hashnode.dev/why-you-should-use-nodejs-for-web-crawling?utm_source=hashnode&utm_medium=feed) [Jun 28, 2025](https://hashnode.com/posts/why-you-should-use-nodejs-for-web-crawling/685fea9bef88745fc6c3d5b1) ### [Why Every Developer Should Learn Bash Scripting](https://tech-automation.hashnode.dev/why-every-developer-should-learn-bash-scripting?utm_source=hashnode&utm_medium=feed) 🧠 What is Bash? Bash (short for Bourne Again SHell) is a command-line language used primarily in Unix/Linux systems (including macOS and WSL on Windows). It’s the glue between your tools. If Python is your power drill, Bash is your toolbox. You can ... 2 min read · [tech-automation.hashnode.dev](https://tech-automation.hashnode.dev/why-every-developer-should-learn-bash-scripting?utm_source=hashnode&utm_medium=feed) [Jun 28, 2025](https://hashnode.com/posts/why-every-developer-should-learn-bash-scripting/685f646a8490135860a3875c)