Let me share a couple of days of a technical writer in software engineering :-)

Think up an idea of what to write about
Search for a material
Learn material
Search for a material
Learn material
Write code
Test code
Send code with tests for review
Draw pictures
Correct code
Send code with tests for review again
Improve pictures
Improve pictures
Correct code
Improve pictures
Write text
Edit text
Edit text
Correct code
Edit text
Send text for review
Edit text
Edit text
Push chunks of code to gist.github.com
Format text with markdown and include gusts
Edit text
Read text before publishing
Push full code to GitHub
Edit text
Write ReadMe
Push Readme into GitHub
Publish text