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New York · Software engineering & leadership
Joseph Deferio
Deep technical work.
Broad ownership.
I build data-intensive backend systems, lead initiatives across teams, and mentor engineers. My work spans search, ML infrastructure, and low-latency serving platforms.
Senior Software Engineer at adMarketplace
Engineering at adMarketplace
Systems. Decisions. Outcomes.
Weeks → days
Experimentation cycles
Architected an ad-serving experimentation platform supporting more than 30 experiments.
6×
Client conversion spend
Increased client conversion spend through an earlier search redesign.
Alongside my engineering career
Founder roles
Caridi Concierge
Co-founder
I lead operations, finance, marketing, and technology for the medical aesthetics practice, and shape business strategy with Dr. Caridi.
Onça Labs
Founder
I own product strategy, design, engineering, customer discovery, and marketing. The company grew out of challenges I encountered while building Caridi Concierge.
A foundation in informatics
Engineering informed by research and team leadership.
Before adMarketplace, I built data services at Mercury Healthcare, grew the Informatics team at Covera Health from one to five, and led clinical informatics projects at Weill Cornell Medicine.
That background shapes how I approach data integrity, privacy, and the decisions systems support.
Research & publicationsConnect