Mobile POS Software for Mines

I'm looking for a skilled developer to create POS software tailored for mining operations. This software will be used on Android and iPhone platforms and must include an offline mode.

Key requirements:
- Issue printed tokens
- Manage entry/exit of personnel and vehicles
- Operate seamlessly on Android and iPhone
- Offline functionality is essential

Ideal skills and experience:
- Experience in developing mobile POS applications
- Familiarity with token issuance systems
- Knowledge of offline data synchronization
- Background in security for sensitive operations

Please provide examples of similar work.