Senior Full Stack Engineer, Unified Experience

The role

You will build shared surfaces, APIs, and front-end systems to connect collector journeys across multiple products. This senior role involves owning the shared architecture and building new features end to end.

What you will do

• Design, build, and maintain fullstack features using Python, FastAPI, Next.js, React, and TypeScript.
• Build scalable, performant, highly available services and interfaces on AWS and Vercel.
• Own features end to end including data model, API contract, front-end implementation, tests, rollout, and post-launch metrics.
• Build and maintain reusable front-end components, APIs, and shared libraries.
• Contribute to cross-surface concerns like shared identity, entitlements, inventory, and navigation.
• Ship behind feature flags with instrumentation.
• Prototype quickly with Product and Design.
• Use AI-assisted development tools to raise throughput.
• Write meaningful tests across the stack using Playwright, Jest, React Testing Library, and Pytest.
• Maintain component documentation and interaction specs via Storybook.

Required qualifications

• 5+ years of professional fullstack development experience
• Proficiency in React, Next.js, TypeScript, and Python
• Hands-on cloud experience
• Strong grasp of architectural patterns, API design, and application performance tuning
• Track record of owning features end to end in production
• Solid front-end fundamentals: responsive UI development, accessibility (a11y), and front-end performance practices
• Experience with state management patterns and tools such as React Context, Zustand, Redux, or Xstate
• Strong testing discipline with tools such as Jest, React Testing Library, Playwright, or Pytest
• Experience with Git and modern CI/CD practices
• Comfortable working across domains including backend APIs, customer-facing web, mobile web, and internal tools
• Clear written and verbal communication
• Experience using or a genuine appetite for AI developer tooling

Nice to have

• Experience integrating or consolidating multiple existing products, including data migrations against live users
• Experience with high-traffic, real-time, or live-event product surfaces
• Background in growth engineering or rapid experimentation frameworks
• Experience in e-commerce, marketplaces, or gaming live ops
• Design system or shared component library ownership
• Passion for collecting, trading, sports, or gaming

About the company

Fanatics is building a leading global digital sports platform. The company offers products and services across Fanatics Commerce, Fanatics Collectibles, and Fanatics Betting & Gaming.