Is it possible to have a prayer for finding a job or a new job?
It would be incredibly beneficial.
The general Tara mantra covers all the 21 Tara's: OM TARE TUTARE TURE SOHA. There are mantras for the indiviudal 21 Tara's according to at least 3 lineages: Atisha, Suraayagupta and Longchenpa.
These individual mantras and the mantra for Vaishravana have to be given in empowerments.
There is also Medicine Buddha, one of whose pledges is to provide practitioners with the necessities of life.
May you and all beings needing jobs and employment be able to quickly find or create meaningful work, increase their wealth, eliminate their debt, use their wealth to help all beings and lead all beings to the Dharma.
OM TARE TUTARE TURE SOHA
THADYATA OM BEYKANZE BEYKANZE MAHABEYKANZE RAJA SAMUGATE SOHA
OM AH HUNG VARJA GURU PEDME SIDDHI HUNG