Hello there,
I'm excited to help you with your project. I have 13+ years of experience in managing and creating various projects in open source technologies. Specifically, I have expertise in client interactions, team management, requirement analysis, design & development for various deliverables such as real estate CRM, BMS4u (employee tracking tool), campaign management system, personal/business websites, e-commerce websites and web portals (hotel booking, job portals etc.).
I understand that you would like to develop and install a small call flow that runs on TWILIO to screen calls. I know TWILIO and I have used it before so I'm sure this won't be a problem for you. When integrating with Google Contacts API and Pushover notifications you should be able to accomplish what you're looking for without any issues. Additionally, with my experience in building call flows, databases, webforms/pages etc., I'm confident that I can create the perfect solution for you.
Please let me know if you'd like me to further clarify any part of the project so we can get started on this exciting venture!