@ Rmsrao,
You started the dasa of Mars in feb 2015 and the antara of Saturn in July 2017. In the Rasi chart, Mars is in the 5th house aspecting the 8th and the 12th houses. This is also the 8th from the 10th house of profession. The 8th house deals with unexpected happenings, obstructions etc. Saturn also aspects the 9th house which is the 12th from the 10th. The 12th signifies losses. In Dasamsa chart also Mars and Saturn both influence the 12th house. Additionally, Saturn also owns the 9th house in Dasamsa. For all these reasons you lost the job.
During the remaining antaras in the dasa of Mars, specially in those of Moon and Sun, you could have obtained a job but these wouldn’t be for long.
In the current dasa of Rahu, again there are chances for job but Rahu is placed in the 12th in Rasi chart and 5th in Dasamsa (8th to the 10th). So the new jobs also not very permanent.
Performing a Shanti for Rahu can help.