The Software Engineer III - Android will write robust and maintainable code, provide guidance on design, and collaborate with other engineers. They will mentor the team, assist with development, and contribute to the agile development life cycle. The engineer will ensure quality through automation and unit testing, improve the app's performance, and provide guidance on non-functional requirements. They will also focus on security, privacy, and continuous improvement of logging and metrics. The role involves working in an agile, startup-like environment and fostering team growth based on company values.