Seth Heinzman
Senior Frontend Engineer
Senior Frontend Engineer with 3+ years building scalable, high-performance web applications at Havertys. Specialized in React architectures, web performance, and experimentation platforms.
Technical Skills
A comprehensive toolkit built over years of hands-on experience and continuous learning.
Frontend
Professional Journey
Lead Frontend Developer
Led full rebuild of Havertys.com frontend architecture, optimized performance for ~1.75M monthly users, and built experimentation and analytics platforms.
- Led full rebuild of Havertys.com frontend architecture (AEM → Edge Delivery, Preact + TypeScript), improving maintainability and performance.
- Optimized Core Web Vitals (LCP, TTI), increasing Lighthouse scores from ~30 → 90+ and significantly improving load performance for ~1.75M monthly users.
- Owned and delivered core eCommerce flows (cart, checkout, PDP/PLP), improving user experience and consistency across the platform.
- Built experimentation platform (Adobe Target + Analytics), enabling A/B testing and data-driven feature decisions across product and marketing.
- Introduced Jest testing (80%+ coverage), reducing regression issues and increasing release confidence.
- Mentored 3 senior engineers within a 6-person team, increasing team autonomy and feature delivery velocity.
- Implemented WCAG 2.1 AA accessibility improvements, reducing accessibility issues by 90%+.
- Established component patterns using Storybook, improving developer experience and UI consistency.
- Worked across legacy (Struts/Java) and modern systems to support business-critical tools.
React Developer (Consulting)
Led frontend development for React applications, acting as primary engineer for UI architecture and feature delivery.
- Led frontend development for React applications, acting as primary engineer for UI architecture and feature delivery.
- Rebuilt and standardized application pages and components, improving maintainability and consistency.
- Partnered with stakeholders to translate requirements into production-ready UI features.
- Improved application stability by debugging issues and refactoring legacy code.
- Established reusable component patterns and improved developer workflows.
- Collaborated cross-functionally to deliver features and ensure seamless integration.
Featured Projects
A collection of work and personal projects that showcase my skills and passion for development.
Modern e-commerce platform delivering furniture shopping experience. Migrated from AEM React to Adobe Edge Delivery Services with Preact, improving Lighthouse scores from 30 to 90+. Implemented accessibility standards, real-time analytics, and A/B testing.
Display overlay for Rocket League streams with real-time game data. Customize the look and feel across multiple overlay options.
Transparent desktop overlay for drawing animated shapes on screen while reviewing Rocket League replays. Features neon glow effects, particle bursts, configurable keybinds, and a draggable toolbar — all themed to match the Grover Gang stream overlay.
Let's Connect
Have a project in mind or want to discuss an opportunity? I'd love to hear from you.