Code of Conduct and Rules of Conflict are Kristine Smith’s first two books about Jani Kilian.
The worlds revealed in the book are interesting– a strong earth trying to keep its colonies held tight, with a fascinating alien race, the Idomeni. The book builds a feeling of claustrophobia, with the characters confined by Chicago’s winter.
There is a lot of small technology– particularly in relation to paper, which is high tech/confidential encrypted, etc. The bigger technology stays largely off screen; shooters function mostly as pistols, ships don’t get described in much detail. It’s a good setting for an investigative mystery, with a lot less tech description and obsession than is common in SF.