Mobile sending sms job

I'm looking for an experienced mobile app developer to create an Android application that allows users to send bulk SMS.

Requirements:
- Android platform
- Bulk SMS sending capability

Ideal Skills and Experience:
- Proficiency in Android development
- Experience with SMS APIs and bulk messaging
- Knowledge of user authentication and app security
- Ability to design a user-friendly interface

Please provide examples of similar work done and estimates on time and cost.