What makes a senior engineer? Writing software vs building systems

The central thesis of this article resonates with me, while the specifics I might debate or disagree with. Piechocki chose to write it using "Junior Engineers" and "Senior Engineers", which may make it harder to parse as many would consider those job titles. If I read this as "Less experienced" and "More experienced" engineers, it resonates better. The primary point is that just writing code is not even close to all you need to be successful. Experienced engineers know where things will break, what situations will happen in a year that you need to plan for now. Bringing those insights to less experienced engineers in a helpful way is one of the most valuable things an experienced engineer can do.