Principal Software Engineer | Consumer Products, Health, Payments, CleanTech & Enterprise Software | 20+ Years

David Dangerfield

Principal Software Engineer with a passion for the craft of software that delights clients. I work across the full-stack shipping new features, upgrades, and fixes across large, multi-repo systems.

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Core strengths

A hands-on principal engineer who enjoys modernizing legacy systems, removing technical debt, and translating product, UX, and business needs into clean code and modern user experiences.

Hands-On Principal Engineering

Shipping features, fixes, and upgrades across large systems with dozens of repos using TypeScript, Vue.js, React, Node.js, and Java.

Legacy Modernization

Rewriting rigid legacy systems into maintainable codebases without disrupting the revenue-critical, regulated, or customer-facing businesses that depend on them.

AI-Accelerated, Quality-Driven Delivery

Using GitHub Copilot and Claude to move faster while keeping code quality, testing, deployment rigor, and user experience standards high.

Technical profile

Languages

TypeScript, JavaScript, Java, Kotlin, Python

Backend & Frameworks

REST APIs, Node.js, Spring Boot, Microservices, Message Queues, Legacy Modernization

Frontend

Vue.js, React, Next.js, Angular, GraphQL, Tailwind, Design Systems, Component Libraries, A11y, I18n

State Mgmt & Data Stores

TanStack, Pinia, Redux, MySQL, MongoDB, PostgreSQL

Cloud & Infrastructure

AWS, Azure DevOps, GitHub Actions, Docker, Kubernetes

AI & Testing Tools

Copilot, Claude, Playwright, Cypress, Jest, JUnit

Industries

Payments FDA-Regulated Healthcare Consumer Products & Platforms CleanTech & Energy Enterprise Software

Career highlights

Patterson Companies: Led frontend architecture for a B2B client portal with associated admin experience, and supported a multi-billion-dollar revenue stream by rewriting the desktop-only Angular.js bill-pay frontend into a responsive, locale-aware Vue.js/TypeScript/ TanStack experience.

Life Time: Led frontend development for account and guest pass experiences, supporting hundreds of thousands of new accounts and app installs.

Nurocor: Delivered a structured FDA clinical trial authoring platform recognized by the TransCelerate BioPharma ClinEco Protocol Review Challenge as "Best Integrated Protocol Authoring and Review Solution."

SmugMug & IBM: Modernized payment infrastructure to Stripe across 10 global currencies at SmugMug and earlier automated software packaging at IBM, eliminating 500+ person-hours annually.

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