Open to opportunities

David Nemetz

@davidnemetz

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Senior Mobile Application Engineer specializing in React Native, HIPAA-compliant, offline-first platforms.

United States

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What I'm looking for

I seek senior mobile roles where I can architect scalable React Native platforms, improve performance and reliability, mentor teams, and deliver secure, high-concurrency commerce or healthcare experiences.

I am a Senior Mobile Application Engineer with 10+ years building HIPAA-compliant, offline-first mobile platforms for healthcare, education, and SaaS used by millions.

I design and deliver cross-platform React Native systems, shared UI frameworks, and release pipelines that improve reliability and accelerate feature parity across teams.

My work includes performance optimization (Hermes tuning, lazy loading), secure data workflows (AES-256, TLS 1.3, OAuth2/JWT), real-time sync, and integrations with AI and connected devices to surface actionable insights.

I mentor engineers, lead architecture for high-concurrency commerce and care platforms, and drive measurable outcomes such as reduced cold starts, lower memory usage, higher retention, and faster release cycles.

Experience

Work history, roles, and key accomplishments

Current

Senior Mobile Engineer

Current

Talkspace

Apr 2024 - Present (1 year 10 months)

Led architecture and delivery of React Native iOS/Android apps supporting 330,000+ completed payor sessions per quarter; reduced platform-specific development by 40%, cut cold start time 28%, and improved retention 18% via offline-first features.

React Native Javascript Typescript Hermes Performance Tuning Fastlane CI CD Sentry Firebase Crashlytics

Senior Mobile Engineer

AlayaCare

Feb 2021 - Mar 2024 (3 years 1 month)

Architected offline-first mobile apps used in 1M+ in-home patient visits/month, achieving 99.9% task completion in no-connectivity environments and reducing audit errors by 35%.

React Native Background Sync Performance Optimization

Mobile Engineer

Articulate

Jul 2018 - Jan 2021 (2 years 6 months)

Developed mobile-first learning platforms for 30,000+ learners across 20+ countries, improving load times 35% and increasing course completion rates 18% through reusable components and offline caching.

React Native Caching Detox Appium Localization

Mobile Engineer

MojoTech

Jan 2017 - Jun 2018 (1 year 5 months)

Delivered mobile apps for clients including fintech and healthcare, built early React Native prototypes that reduced time-to-market ~35% and integrated HIPAA/PCI-compliant auth and billing solutions.

React Native iOS Android GraphQL Expo Performance Optimization