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Open to senior frontend opportunitiesRemote · United States

Seth Heinzman · Senior Frontend Engineer

I build fast, accessible frontend products.

I'm a senior frontend engineer who builds across frameworks and delivery systems, with React and TypeScript as my preferred tools. I focus on architecture, performance, accessibility, and reliable delivery for products used at scale.

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monthly site users
1.75M
Lighthouse score improvement
30 → 90+
unit-test coverage introduced
80%+
accessibility issues resolved
90%+
Explore the work

Selected Work

Enterprise frontend platform · 2023-present

Havertys.com

Led the frontend replatform of a high-traffic retail platform, replacing an AEM React architecture with Adobe Edge Delivery Services, Preact, and TypeScript.

  • Improved Lighthouse scores from roughly 30 to 90+ for a site serving about 1.75M users each month.
  • Delivered product discovery, product detail, cart, and checkout experiences across the customer journey.
  • Preact
  • TypeScript
  • Edge Delivery Services
  • Adobe Analytics
  • +3

Windows desktop product · Microsoft Store

BOOST Broadcast Toolkit

Designed and built a local broadcast control room for Rocket League productions, giving operators one place to manage live data, overlays, teams, players, cameras, sponsors, and presentation states.

  • Ships as a Windows desktop app through the Microsoft Store.
  • Serves a transparent 1920×1080 browser output for OBS and Streamlabs over local HTTP and WebSocket services.
  • Electron
  • React
  • TypeScript
  • Node.js
  • +3

Desktop utility · Electron

RL Replay Draw

Built an always-on-top annotation tool for explaining plays during Rocket League replay reviews without covering the game footage.

  • Created a transparent canvas with animated drawing tools and configurable keyboard shortcuts.
  • Designed a movable toolbar that stays useful without obstructing the replay.
  • Electron
  • React
  • TypeScript
  • Vite
  • +1

Open-source experiment · Frontend tooling

AEM EDS Vite Boilerplate

An experimental starter exploring how Adobe Edge Delivery Services can keep its authored content model while using a modern Vite, Preact, and TypeScript development workflow.

  • Uses Edge Delivery Services for content and routing while preserving local npm-based development.
  • Bundles and code-splits block scripts and styles through Vite.
  • Edge Delivery Services
  • Preact
  • TypeScript
  • Vite
  • +2

Experience

2023-present

Lead Frontend Developer

Havertys Furniture
Atlanta, Georgia

Technical lead for Havertys.com, responsible for frontend architecture, performance, accessibility, quality, and experimentation across a production platform.

Selected impact

  • Led the replatform from AEM React to Adobe Edge Delivery Services with Preact and TypeScript, simplifying the delivery architecture for a site serving about 1.75M users monthly.
  • Improved Lighthouse scores from roughly 30 to 90+ by addressing Core Web Vitals and the critical rendering path.
  • Led development of complex customer-facing experiences across discovery, product, cart, and checkout flows.
  • Introduced Jest and grew unit-test coverage above 80%, improving release confidence and regression detection.
  • Resolved more than 90% of identified accessibility issues and established reusable UI patterns in Storybook.
  • Mentored three senior engineers on a six-person team while coordinating delivery with product, design, marketing, and backend partners.
  • Preact
  • TypeScript
  • Edge Delivery Services
  • Adobe Target
  • Adobe Analytics
  • Jest
  • Storybook

2021-2023

React Developer, Consultant

PitaTech
Remote

Primary frontend consultant for React applications, translating client requirements into maintainable UI architecture and production releases.

Selected impact

  • Set the frontend architecture and delivery approach for client-facing React applications.
  • Consolidated duplicated pages and components into reusable patterns that were easier to maintain and extend.
  • Worked directly with stakeholders and backend partners to scope features, resolve recurring defects, and carry work through integration and release.
  • React
  • TypeScript
  • JavaScript
  • HTML
  • CSS

Education

M.S. Software Engineering

Florida Institute of Technology

2023

B.S. Information Technology

University of Central Florida

2021

Focus

Frontend architecture

Designing component systems and application boundaries that stay understandable as teams, features, and traffic grow.

  • React
  • Preact
  • TypeScript
  • AEM
  • Edge Delivery Services

Performance engineering

Finding the bottlenecks behind real user friction, then improving delivery, rendering, and Core Web Vitals without trading away maintainability.

  • Core Web Vitals
  • Lighthouse
  • SEO
  • Bundle strategy

Accessible product UI

Building resilient interaction patterns and complex user flows around semantic HTML, keyboard support, and WCAG 2.1 AA.

  • WCAG
  • Semantic HTML
  • Design systems
  • Responsive UI

Experimentation & analytics

Connecting implementation to evidence through consistent instrumentation, controlled experiments, and measurable product outcomes.

  • Adobe Target
  • Adobe Analytics
  • Web SDK
  • A/B testing

Quality engineering

Moving confidence earlier in the release cycle with focused unit coverage, end-to-end checks, and reusable Storybook patterns.

  • Jest
  • Cypress
  • Storybook
  • Regression prevention

Technical leadership

Turning broad product goals into delivery plans, mentoring senior engineers, and aligning frontend work across product, design, and backend partners.

  • Architecture
  • Mentorship
  • Planning
  • Cross-functional delivery

Contact

Let's Talk.

Remote · United States

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