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Abdulrahman Jamjoom and the art of making the parts fit
From a drawing robot at Harvard to a debit card for neighborhood shops, Abdulrahman Jamjoom kept building things that had to work in the real world. At Arini, that habit now shapes how he builds AI with his longtime collaborator Rami Rustom.
Threads and the trouble with a borrowed crowd
Instagram could get people through the door. Keeping them there required a different guest list - and a lesson in the unglamorous business of building a habit.
Abdul Jamjoom
Abdul Jamjoom is the co-founder and CEO of Arini, a San Francisco startup building an AI receptionist that answers phones, books appointments, and handles patient communication for dental practices around the clock. A Harvard computer science graduate and former search and applied-AI engineer at the enterprise messaging company Threads, he teamed up with his high-school friend Rami Rustom - the pair met in Jordan - to attack a market they found by literally walking into dental offices and watching front desks melt down. Backed by Y Combinator (W24), Arini turns the $7B-a-year dental front-desk problem into software that, in Jamjoom's words, just gets the job done.
Meta
Meta Platforms is the company behind Facebook, Instagram, WhatsApp, Messenger, and Threads - a Family of Apps used by more than 3 billion people daily. Founded as Facebook in 2004 and renamed Meta in 2021, it runs one of the world's largest digital advertising businesses while pouring tens of billions into artificial intelligence (the open-weight Llama models and Meta AI assistant) and wearable computing (Quest headsets and Ray-Ban Meta smart glasses). In 2025 it reported roughly $201 billion in revenue.