Senior Full Stack Engineer, Unified Experience

Support Fanatics Collects Unified Experience initiative building seamless collector journeys across Fanatics Live Marketplace Instant Rips Collections Topps and future experiences.

Today a collector can win a card in a live show rip a pack buy on the marketplace and store it all in a vault but those moments still feel like separate products. Your job is to make them feel like one. That means building the shared surfaces APIs and front-end systems that connect experiences built independently without slowing any of them down.

This is a hands-on senior role with afrontend-leaningcenter of gravity. Youll own meaningful slices of the unified experience end to end (UI through API contract) primarily in TypeScript React and on Vercel withGraphQL as the owned front-to-back contract. Youll partner with a Staff Backend Engineer mobile engineers product and design.

Fanatics Collect is growing fast and the unification work is the highest-leverage engineering investment we have: every new app drop and live format gets easier once the shared foundation exists. Youll work across mobile web and internal tools with real autonomy and a short path from idea to production. Your teammates are passionate about the space and most of them are collectors themselves.

Our surfaces reach millions of collectors across iOS Android and web with live high-traffic moments (breaks drops auctions closing) that make performance accessibility internationalization and reliability non-negotiable. Youll work across multiple existing products with real users and real data so migration backward compatibility and careful rollout are part of the craft.

• Ship a meaningful user-facing piece of the unified experience end to end.
• Build a working map of how Live Marketplace Instant Rips Collections and Topps fit together today: data models identity entitlements and the seams between them.
• Establish working relationships with the backend mobile product and design partners youll depend on.
• Identify one piece of duplicated or divergent logic across surfaces and make the case for consolidating it.

• Design build and maintain fullstack features with a frontend lean: TypeScript React and Vercel plus backend work in Python/FastAPI (or equivalent) when the feature needs it.
• Own GraphQL (and related API) contracts for what you ship: schema collaboration generated types validation and compatibility. Treat contract drift as a bug.
• Build scalable performant interfaces and services on Vercel and AWS.
• Own features end to end: UI API contract tests rollout and post-launch metrics.
• Build and maintain reusable front-end components design-system tokens shared packages/SDKs and monorepo libraries that multiple apps depend on.
• Ship commerce and cross-surface UX (identity entitlements navigation checkout/offers) that feels continuous across products.
• Make accessibility (a11y) internationalization (i18n) and localization part of how you ship not a follow-up.
• Ship behind feature flags with instrumentation in place and use the data to decide what to keep fix or cut.
• Prototype quickly with Product and Design when a working demo settles a debate faster than a document.
• Use AI-assisted development tools (Cursor Claude Code LLM workflows) to raise throughput and share what works.
• Write meaningful tests across the stack: Playwright Vitest or Jest React Testing Library visual regression (Chromatic) and Pytest where you touch backend; keep CI trustworthy.
• Maintain Storybook (and Chromatic) for components and interaction specs; use Tailwind alongside the design system.
• Participate in sprint planning retros and product strategy; raise scope and sequencing concerns early.
• Mentor through code review and pairing; raise the bar on structure testing contracts and docs.

• 5 years of professional fullstack development with strong TypeScript React and Vercel plus solid backend experience (Python/FastAPI or equivalent) and cloud (AWS preferred).
• Experience owning or co-owning API contracts between UI and backend ideally GraphQL (schema codegen/typed clients compatibility).
• Strong grasp of architectural patterns API design and performance tuning plus the judgment to keep solutions simple.
• Track record of owning features end to end in production including monitoring debugging and iterating on real user behavior.
• Solid front-end fundamentals: responsive UI accessibility (a11y) internationalization (i18n) localization and performance.
• Experience with design systems: tokens shared packages/SDKs and monorepo multi-app consumption.
• Experience with or clear aptitude for platform-style frontend work across stacks: shared packages migrations multiple consumers.
• Experience with state management patterns (React Context Zustand Redux XState or similar) without over-engineering.
• Strong testing discipline: Playwright Vitest or Jest React Testing Library Chromatic or equivalent and backend testing (e.g. Pytest).
• Experience with Tailwind and Storybook in real teams.
• Experience with Git and modern CI/CD.
• Comfortable working across domains (backend APIs customer-facing web mobile web internal tools) without dropping threads.
• Clear written and verbal communication with Product Design and other engineering teams.
• Experience using or a genuine appetite for AI developer tooling.
• Bachelors degree in Computer Science or equivalent practical experience.

• Integrating or consolidating multiple existing products including data migrations against live users.
• High-traffic real-time or live-event product surfaces.
• Growth engineering or rapid experimentation frameworks.
• E-commerce marketplaces or gaming live ops.
• Deep design system or shared component library ownership.
• Passion for collecting trading sports or gaming and interest in being a user of what you build.

If you like owning problems end to end care about how software feels and not just whether it works and want your work used daily by millions of collectors wed love to talk.

Ensure your Fanatics job offer is legitimate and dont fall victim to fraud. Fanatics never seeks payment from job free to ask your recruiter for a phone call or other type of communication for interview and ensure your communication is coming from a Fanatics email address (including @). For added security where possible apply through our company website at salary range represents base pay only and does not include short-term or long-term incentive compensation. This salary range is specific to Los Angeles and may not be applicable to other locations. When determining base pay as part of a final compensation package we consider several factors such as location experience qualifications and training. For information about our benefits please visithttps:// Angeles Salary Range

$144000 - $180000 USD