  The proliferation of Internet-connected health devices and the widespread
availability of mobile connectivity have resulted in a wealth of reliable
digital health data and the potential for delivering just-in-time
interventions. However, leveraging these opportunities for health research
requires the development and deployment of mobile health (mHealth)
applications, which present significant technical challenges for researchers.
While existing mHealth solutions have made progress in addressing some of these
challenges, they often fall short in terms of time-to-use, affordability, and
flexibility for personalization and adaptation. ZotCare aims to address these
limitations by offering ready-to-use and flexible services, providing
researchers with an accessible, cost-effective, and adaptable solution for
their mHealth studies. This article focuses on ZotCare's service orchestration
and highlights its capabilities in creating a programmable environment for
mHealth research. Additionally, we showcase several successful research use
cases that have utilized ZotCare, both in the past and in ongoing projects.
Furthermore, we provide resources and information for researchers who are
considering ZotCare as their mHealth research solution.
