Multi-Platform Utility App Development

I need a talented app developer to create a utility app compatible with both iOS and Android platforms. The app is primarily meant to serve as a utility tool with key features outlined below:

- Ability to work on both iOS and Android devices.
- Seamless integration with a specific pre-existing database.

The ideal candidate for this project should have:

- Strong experience in creating apps for both iOS and Android.
- Proven track record in integrating apps with specific databases.
- Understanding of utility tool application development.

Your proposal should detail your previous experience in this niche and your strategy for this project. Please include the approximate timeframe and cost in your bid. Looking forward to reading your proposals.