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dmascia/README.md

πŸ‘‹ Hi, I'm David Mascia

Software Engineer β€” Full-Stack | AI Platforms Β· Web Β· Mobile Β· Distributed Systems

πŸ“ New Jersey, USA (Remote)
πŸ”— LinkedIn
πŸ’» GitHub
✍️ Tech Blog


πŸš€ About Me

Hands-on Software Engineer with 20 years building and scaling web, mobile, and backend systems β€” the last several as the technical lead and architecture owner on high-velocity product teams.

I ship production code across the full stack (React/Next.js, React Native, Node/NestJS, Python, Java) and design the systems around it: distributed services, real-time streaming, and HIPAA-compliant generative-AI platforms on AWS Bedrock. I like being the person who both sets the technical direction and writes the hard parts.

Proven at scale and ownership: architected the core marketplace behind $250M in annual gross revenue, shipped platforms serving 1M+ active users, and delivered 300+ partner integrations generating $5M+ in annual revenue.

What I optimize for: clean system design, shipping real code fast at high quality, strong observability, and applied AI.


πŸ“Š Impact & Scale

Scale delivered

  • Architected systems supporting $250M+ annual gross revenue
  • Shipped platforms serving 1M+ active users
  • Delivered 300+ partner integrations generating $5M+ annualized revenue
  • Launched a React Native app generating $1M in first-season sales

Recent delivery & operational excellence @ Equip Health (2026)

  • Architected and shipped the patient-facing MyEquip app to ~4,000 weekly active patients
  • Sustained 99.95% crash-free sessions and a 0% ANR rate on mobile, with 92.7% of web views rated "Good" on Core Web Vitals across ~400K+ weekly views
  • Team's top code reviewer β€” 267 PRs reviewed in 2026 (~1 in 3 of the team's), serving as the final architecture & quality gate
  • Built an agentic-AI SDLC on Claude Code + AWS Bedrock, contributing to ~640 merged PRs at a sustained sub-24-hour median PR turnaround

☁️ Cloud, Scale & Reliability

Designing and operating cloud platforms for scale and availability.

Cloud

  • AWS
  • Google Cloud Platform (GCP)
  • AWS Bedrock
  • AWS Amplify
  • AWS EC2

Architecture

  • Distributed systems
  • Microservices
  • Cloud-native, high-availability platforms
  • API architecture (REST & GraphQL)
  • Observability (Datadog, New Relic) Β· SLOs Β· Core Web Vitals

DevOps

  • Kubernetes
  • Docker
  • Terraform
  • GitHub Actions
  • CI/CD automation

πŸ€– AI Engineering & Innovation

Building the next generation of AI-powered software engineering workflows.

Agentic AI & Generative AI

  • Agentic AI Software Development Lifecycle (SDLC)
  • Retrieval-Augmented Generation (RAG)
  • Large Language Model (LLM) applications
  • Claude Code
  • AWS Bedrock (Agents, AgentCore)
  • AI-assisted software development & workflow automation

Recent focus:

  • Built and drove adoption of an agentic-AI SDLC across requirements β†’ implementation β†’ testing β†’ documentation
  • Designed and built HIPAA-compliant AI healthcare workflows using RAG and LLM-powered patterns
  • Developed AI-driven patient-engagement and conversational healthcare experiences

πŸ“± Web & Mobile Engineering

Building scalable applications across web and mobile ecosystems.

Frontend

  • React / React 19
  • Next.js (App Router, Server Components)
  • TypeScript
  • Redux/RTK
  • GraphQL

Mobile

  • React Native
  • Expo
  • iOS / Android (Kotlin)
  • Real-time applications
  • HLS video streaming
  • WebSocket architectures

Selected achievements:

  • Increased watch time 40% and retention 70% on a live-streaming platform
  • Delivered platforms serving 1M+ active users

πŸ† Career Highlights

eCommerce Platforms at Scale

  • Architected the core e-commerce marketplace supporting $250M+ annual gross revenue
  • Delivered 300+ partner integrations generating $5M+ annualized revenue
  • Launched a React Native app generating $1M in first-season sales

Media / Streaming

  • Scaled a live-streaming platform to 1M+ users (React, GraphQL, Kubernetes, GCP)
  • Built the company's first React Native app with HLS live streaming, real-time comms, and AI-assisted engagement experiences
  • Built high-availability systems that held up through peak live events

Healthcare AI

  • Technical lead for patient-facing products in a HIPAA-regulated environment at Equip Health
  • Lead engineer shipping a greenfield, HIPAA-compliant conversational-AI telehealth platform during a $1M institutional funding round
  • Built RAG-based patient-knowledge workflows on AWS Bedrock AgentCore

FinTech

  • Built a greenfield cross-platform React Native AI advisor on AWS Bedrock Agents β€” handled ~3K customer sessions/week and lifted conversion 32%

πŸ› οΈ Technology Stack

Languages
β”œβ”€β”€ TypeScript
β”œβ”€β”€ JavaScript
β”œβ”€β”€ Python
β”œβ”€β”€ Java
β”œβ”€β”€ Kotlin
└── SQL

Frontend / Mobile
β”œβ”€β”€ React
β”œβ”€β”€ React Native
β”œβ”€β”€ Next.js
β”œβ”€β”€ Expo
└── GraphQL

Backend & Data
β”œβ”€β”€ Node.js
β”œβ”€β”€ NestJS
β”œβ”€β”€ Django
β”œβ”€β”€ PostgreSQL
β”œβ”€β”€ MySQL
└── Redis

AI / ML
β”œβ”€β”€ Generative AI
β”œβ”€β”€ Agentic AI
β”œβ”€β”€ RAG
β”œβ”€β”€ LLM Applications
β”œβ”€β”€ Claude Code
└── AWS Bedrock

Cloud & Scale
β”œβ”€β”€ AWS
β”œβ”€β”€ GCP
β”œβ”€β”€ Kubernetes
β”œβ”€β”€ Docker
β”œβ”€β”€ Terraform
└── Distributed Systems

Pinned Loading

  1. react-native-use-tts react-native-use-tts Public

    A production-grade, npm-publishable React Native Text-to-Speech hook with queueing, priorities, telemetry hooks, and deterministic initialization.

    TypeScript

  2. aws-bedrock-agentcore-runtime-example aws-bedrock-agentcore-runtime-example Public

    A production-quality reference implementation for interacting with AWS Bedrock AgentCore runtimes. Demonstrates correct runtime session management, safe AWS credential handling via the SDK default …

    TypeScript

  3. aws-bedrock-agentcore-postman aws-bedrock-agentcore-postman Public

    Postman-based tooling for invoking AWS Bedrock AgentCore runtimes with reusable runtime sessions, dynamic headers, and secure AWS credential injection.

    1 1

  4. Gallery Gallery Public

    TypeScript

  5. leetcode_sync leetcode_sync Public

    Python

  6. password-entry-library password-entry-library Public

    TypeScript