GPS solution(Teltonika,Traccar)

we have GPS services we rely on traccar as software and Teltonika as a Devices, we are looking for someone to have a background in GPS fields and support us in doing installation and modification on the traccar or doing configuration on the GPS devices (Teltonika), and also changing the documentation(presentation) of the GPS services, and he/she has to work with us continuously and should be supportive if we need him urgently