Denis Arsenault

Designer of a privacy-preserving, offline-first iOS healthcare billing app using Swift, SwiftUI, async-await/Combine and Apple frameworks. Developed on-device document scanning, OCR, layout parsing, and data extraction for EOBs, bills, claims, insurance records, and collection notices. Integrated Core ML models for entity extraction, semantic matching, anomaly detection, and patient-friendly explanation generation. Implemented cross-document reconciliation to match charges, payments, adjustments, denials, service dates, medical codes, providers, insurers, and patient balances. Optimized local storage, security, performance, and App Store-ready deployment across iPhone and iPad.

Conducting threat research and vulnerability analysis on iOS ecosystems, developing security tools, and automation scripts to enhance application security. Collaborating with cross-functional teams to integrate security throughout the software development lifecycle. Develop security tools, proof-of-concepts, and automation scripts for offensive and defensive use cases.

Lead iOS developer for Virtual Hanger for iPad 1.0 — a Learning Content Management System built in UIKit and SwiftUI with embedded Unity learning modules. Drove SwiftUI adoption for new product surfaces while keeping legacy UIKit code paths stable. Authored cross-platform Bash deployment scripts to streamline TestFlight and ad-hoc distribution pipelines.