Dear Mr. Hiring Manager,
I am experience Android developer and created a lot of emergency and gps tracking applications. Recently I started also a similar project based on Traccar (not finished yet) and can advice that one as a server.
Traccar has a list of supported gps devices, so you can find the one which you want to use from this list, to be sure that it will work.
Let's discuss your project further! I am excited to hear from you soon and very interested. Since such apps are well-known to me I will be happy to deliver you a successful project!
With best regards,
Sargis