[RobinL]

Fellow data engineer here. I started mine because I felt I was making the same arguments again and again at work, often ineffectively.

I found that by taking time to collect my thoughts and write them down made them clearer and more persuasive. An unexpected side effects it that I started to have greater influence beyond my immediate team, with random colleagues emailing me about posts. Though it hasn't directly found me a job it has resulted in people asking me to apply to positions.

Later I added more technical content and tutorials about the problems I was immediately working on, partly just as a way of documenting things I'd found out and helping myself to understand them.

Overall I think it's been extremely valuable in terms of self development and my career (but this is heavily influenced by the fact I enjoy doing it)

I would say don't think too much about your audience to begin with and just write about things you're personally interested in. I've literally never had negative feedback/trolling (probably because there's no comment section). I have virtually met a number of people interested in similar topics who've contacted me after reading the blog.

Fwiw, by blog is https://www.robinlinacre.com/