Word for something that's worth remarking about [closed]

Noteworthy

Worthy of notice or attention; notable; remarkable:

A noteworthy addition to our collection of rare books.

If OP feels that significant is "too strong" for the context, it can easily be "tempered" by...

Developers spend a not insignificant amount of time writing this type of code.

There are a claimed 94 written instances of the above usage in Google Books above, compared to over 2000 for a significant amount of time. If a speaker avoids a far more common "direct" form, native speakers automatically assume there must be a reason - often, that the direct form carries "extreme" connotations that aren't appropriate for the specific context.