Hi,
You are looking for a native app developer but you mentionned Titanium as the required skills for the project.
You do indeed need someone who has worked with that plateform but mainly require someone or a team that has exetensively developed applciations natively for android and the iphone, which we represent the best candidate you could ever find around here.
Please check our portfolio which includes several applications developed for both plateforms (fully developed, or just wrappers).
If you have any questions please do not hesitate to contact us for any questions.