Jett Reno

Worked a lot of odd jobs before joining Starfleet;
Including VIP shuttle pilot, deep mercury welder, bartender, & as a smuggler
Lost her wife during the Federation-Klingon War, joined Starfleet afterwards
Survived the crash landing of the Hiawatha, rescued by the USS Discovery in 2257
Assigned to the USS Discover as an Engineer
2258: Traveled to the 32nd century with the rest of the Discovery crew
3192: Transferred to Starfleet Academy, taught Temporal Mechanics