Cross-Platform Fintech Savings App Development

I'm looking for an experienced mobile app developer to create a fintech savings application on both iOS and Android platforms. The app should primarily focus on budget tracking and providing spending insights.

Key Requirements:
- Budget tracking feature
- Spending insights
- Password-based authentication

Ideal Skills and Experience:
- Proven experience in developing fintech apps
- Strong knowledge in budget tracking and spending insight features
- Expertise in both iOS and Android app development
- Familiarity with secure password-based authentication systems
- UI/UX design skills to ensure a user-friendly interface
- Familiar with open banking set up with Basiq

Please provide examples of previous work, especially in the fintech sector.