Hi sir , I am an expert in this field, I have 15 yrs experience of website for business so I have good knowledge skill- PHP , WEBSITE , HTML , CSS , DESIGN . and so built many apps 200+ for international client UK , US . GERMANY , FRANCE , SINGAPORE.
check our portfolio on site https://www.freelancer.in/projects/android/Scanning-application-needed/details
with regards
DAN.