Senior Full Stack JavaScript Engineer

Senior Engineer 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 Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities This employer is required to notify all applicants of their rights pursuant to federal employment laws. For further information, please review the Know Your Rights notice from the Department of Labor. GameStop