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Memory Alpha

Crewman Jarvis was a female operations division crew member of USS Voyager while the ship was in the Delta Quadrant. She was in engineering following Voyager's transport there by the Caretaker. (VOY: "Caretaker" (per "Projections"))

She worked as transporter chief in transporter room 3 and beamed the two Vidiians Dereth and Motura aboard the ship. (VOY: "Phage")

She was on duty in engineering when B'Elanna Torres and Harry Kim searched for a way to free the microprobe from inside the micro-wormhole. (VOY: "Eye of the Needle")

She was working in engineering when a dead Vhnori body appeared in the Jefferies tube next to engineering. (VOY: "Emanations")

She was working in engineering when the Komar took over several crewmembers including B'Elanna Torres and when Torres ejected the warp core while under the influence of Chakotay. (VOY: "Cathexis")

Jarvis, security

A holographic duplicate of Jarvis

She was sitting at a table near the window in the mess hall and talking to a fellow officer when the former Maquis crewmembers Chell, Gerron, Henley, and Dalby talked about their training with Tuvok. She was also present when the four Maquis trainees later passed the section during their training with Tuvok. She remained in the mess hall and was present when Neelix talked to Tuvok about his flexibility. (VOY: "Learning Curve")

While The Doctor was delusional in 2371 he imagined that he and Reginald Barclay were going to disable the holographic memory core in engineering and that Janeway ordered holographic duplicates of Jarvis and Parsons to stop them. (VOY: "Projections")

Crewman Jarvis was played by recurring background actress Beth Rogers who received no credit for her appearances but was identified by the call sheets of the episodes.
The scene in the transporter room for the episode "Phage" was filmed on 2nd Unit on Friday 6 January 1995. Originally, Julie Jiang was listed on the call sheet.
Jarvis was identified by name in the episode "Projections".