# Why I Wrote This Guide I wrote this guide while interviewing for a few big tech companies. Namely, Dropbox and Square. I was up for some architectural Frontend Roles, where Systems Design interviews are the deciding factor for getting the job. I tried searching for some videos, but most examples were for Backend/Distributed System problems. So I had to piece together some knowledge I had from my career, asked a few folks to help out, and did a few mock interviews. I decided to release this as open source, because us FE folks need some love too!!! Feel free to make PRs and [contribute](https://github.com/tolicodes/feinfra)! --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://www.feinfra.com/why-i-wrote-this-guide.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.