Joshua Horn

I’m a Senior Software Engineer building high-reliability backend and API platforms for healthcare—where privacy, accuracy, and uptime are non-negotiable. At Google, I led backend development for AI Overviews (Java/Go, GCP), scaling health information to 50M+ users across 12 languages while reducing hallucinations by 99.7% and maintaining 99.99% uptime.

I also architected the HealthConnect MedicalRecords API (Python/FHIR), enabling 5,000+ apps to securely manage 50+ health data types for 15M+ Android users using a privacy-centric on-device storage model. Previously at Flatiron Health, I engineered clinician-facing experiences and real-world evidence data pipelines—cutting documentation time by 25%, improving data quality by 45%, and accelerating cancer research by 3×—and I’ve continued this work through projects like a privacy-centric Health Connect platform (on-device storage + FHIR transformation) and TxGemma AI model integration (clean Python APIs that simplify secure access to internal AI models).