Google Appsheet Developer and Modification Specialist Needed

I'm in need of an experienced Google Appsheet developer to modify and develop existing apps built using Google's no-code platform called Appsheet. Key tasks will include implementing modifications to improve functionality and enhance user experience as well as development of new modules, functions and features. Additionally, the successful freelancer must have experience with API integrations.

In addition to the skills and experience listed above, it is crucial for the successful freelancer to be available to work during hours that complement our business hours in South Africa (UTC+2). Specifically, we are looking for a freelancer based in time zones that are active during South Africa's evening and/or early morning hours, anything from 3 to 8 hour overlaps work for us. This arrangement is aimed at maximizing our productivity and ensuring a seamless, continuous development cycle for our Appsheet applications. The ability to work efficiently with minimal direct supervision during these hours will be highly valued, as it aligns with our goal of near-24-hour development and maintenance progress on our projects.

Ideal Skills & Experience:
- Proven experience with Google Appsheet, including modifying existing apps
- Specific expertise in data management applications
- User Access modules / function in Appsheet
- Competency with Google Sheets and PostgreSQL integrations
- Excellent problem-solving skills and high-quality work ethic

Please provide examples of your past work with Google Appsheet, particularly instances of app modification and system integration. Looking forward to a successful collaboration with a skilled freelancer.