Senior Full Stack JavaScript Engineer

Job Description

Job Description

As a Senior Engineer, you'll work across the full stack of this app from Chakra UI components and TanStack Router pages down to server functions that call Salesforce and other third-party APIs. You'll set technical direction within your domain, review code against our established architecture, and mentor other engineers on the team.

This role is 5-days a week onsite in Grapevine, TX.

What You'll Do

• Design and build features across GameStop: routes, UI components, and the hooks/server-function layer that talks to Salesforce Commerce Cloud and other services
• Write server-side data-fetching and mutation logic, following the established patterns
• Write strict, type-safe TypeScript with Zod validation at API and form boundaries
• Build and maintain the Chakra UI theme, design tokens, and reusable UI primitives
• Own performance and reliability of a server-rendered app SSR behavior, Core Web Vitals, and production monitoring via New Relic
• Write unit tests for data transformations and validation logic, and contribute to the Cypress end-to-end test suite
• Partner with the SFRA and OIDC provider teams to ensure the storefront integrates cleanly with authentication and any legacy Salesforce cartridge behavior
• Participate in code review and uphold the team's architecture and folder-structure conventions
• Mentor other engineers and help evolve technical standards as the codebase grows

Required Qualifications

• 5+ years of professional experience building production React applications
• Expert-level React and TypeScript practices
• Experience with a full-stack/server-rendered React framework (e.g., TanStack Start, Next.js, Remix) and modern Vite-based tooling
• Strong understanding of state management tradeoffs: server state, form state, and local UI state
• Experience integrating REST APIs from the front end and/or server layer (Axios or similar clients)
• Experience with a component library or design system (Chakra UI, MUI, or similar)
• Comfort writing tests and working with e2e test suites (Cypress/Playwright)
• Experience in a fast-paced ecommerce environment, including familiarity with checkout and payment flows
• Proficiency with Git-based workflows and CI/CD pipelines
• Strong communication skills and experience mentoring other engineers

Nice to Have

• Experience with Salesforce Commerce Cloud SCAPI (Shopper APIs), including SDKs like commerce-sdk-isomorphic
• Experience with Salesforce SFRA (Storefront Reference Architecture) or other SFCC cartridge-based development
• Familiarity with legacy Salesforce OCAPI
• Experience with OIDC/OAuth authentication flows
• Experience integrating payment providers such as Stripe or PayPal
• Experience with headless CMS platforms (Amplience or similar) or ecommerce search/merchandising tools (Constructor.io, Algolia)
• Experience deploying to Cloudflare Workers or similar edge platforms
• Familiarity with Storybook for component development

What Makes You Stand Out

• A track record of progressing from software engineer into senior or technical-lead roles
• Experience owning a feature or platform area end-to-end in a fast-paced environment
• A bias for action and comfort making tradeoffs in ambiguous situations to deliver customer impact
• Genuine interest in gaming, retail, or ecommerce