Hi, I'm a Delphi developer with more than 30 years of experience (yes, since the times of Borland's Turbo Pascal). I have also developed a number of FMX applications, and some mobile Delphi+FMX applications. I also have experience using EWS API, which seems to be another of your requirements. I'm currently retired, so I can put enough time into your project to ensure rapid completion.
I'm sure I can help with your project, and enjoy working Delphi+FMX for mobile apps, however, want to point out that this combination has some limitations regarding the target devices, particularly for Android (less so for iOS). For example, Delphi apks won't run on devices without ARMv7. If you are aware of these limitations, I'm certainly willing to develop your application.
If you think you may be interested in my services, please send me PM.I can then provide a copy of my CV (for you to check reference/experience) and we can further discuss your project and come out with an acceptable time schedule.
Best regards,
Marco García