Lieutenant Fusilier In The Farthest Reaches is a light hearted pulp novel about a robot soldier in Space Britain's army who becomes an officer. While not the first to do so, she's only like the 9th in all of British history and faces some social challenges from it, primarily from her fellow robots.
It manages to be a metaphor for both class mobility and transness. I can really relate to her concerns about standing out, being questioned about where she belongs, and her joy at seeing and being who she *wants* to be.
If another is written, I'll be very excited for it, and if this is the only one, I'll be glad for the wonderful time I had with it!