Senior Frontend Developer: React, Next.js

Salary: $120,000 - 140,000 per year Requirements: We need deep expertise in React, Next.js, TypeScript, and modern frontend architecture.We need proven experience building frontend foundations from scratch, including shared components, a design system, and reusable conventions.We want a strong point of view on design system implementation, including styling choices and accessible components built on headless primitives.We need the ability to define rendering strategy and the server/client boundary in React and Next.js with clear technical reasoning.We need experience shaping asynchronous server state, including fetching, caching, invalidation, and optimistic updates.We need a background designing information-dense B2B or operational interfaces such as tables, forms, dashboards, and multi-step workflows.We need strong experience with complex forms, schema-based validation, and type-safe form handling.We need the ability to build responsive, accessible interfaces that meet modern accessibility standards.We need experience operating a monorepo and setting up build and cache pipelines from the ground up.We want a practical, thoughtful approach to testing across unit, integration, and end-to-end layers.We need a clear perspective on code quality and review culture, with experience establishing or leading standards.We prefer experience with state- and permission-based rendering architectures.We prefer experience in OMS, WMS, logistics, commerce, or multi-tenant SaaS environments.We prefer experience partnering on API and data contract design, or broader full-stack experience.We prefer experience setting up build, deploy, lint, and formatting tooling from zero.We prefer experience building 0 to 1 products at an early-stage startup or small team.We need candidates who can commute within one hour of Fullerton, California for an in-person role.We require experience with REST and Next.js, with five years in each noted in the source. Responsibilities: We will have you build the frontend foundation early in the product, defining shared components, patterns, and conventions that future features can rely on.We will have you identify, design, and implement reusable structure while we build the OMS first and prepare for the later WMS expansion.We will have you design the rendering approach and server/client split for the product.We will have you shape data fetching, caching, refresh, and consistency strategies across shared screens and datasets.We will have you collaborate with backend and product teams to align screen structure, data models, and API contracts from the outset.We will have you design and deliver intuitive, modern B2B operational interfaces without unnecessary complexity.We will have you refine user-facing details such as loading skeletons, default views, and empty states.We will have you set up the frontend development environment and tooling, including linting, builds, and deployment pipelines.We will have you establish code review expectations and help keep frontend quality consistent. Technologies: APIBackendFlowFrontendSupportRESTReactTypeScriptBackboneCI/CDCSSCypressE2EGraphQLJavaScriptJestNextJSpnpmPlaywrightUX UI DesignWeb More: We are ShipCore, a logistics operations platform that brings together an OMS and WMS in a single multi-tenant SaaS product. Our platform supports the full operational flow, from seller order management and marketplace listing control to warehouse inbound, outbound, and inventory processes, with support for multiple roles on one account. This is a full-time, in-person opportunity based in Fullerton, California, and the compensation package includes health insurance, paid time off, sick days, an employee discount, and daily lunch. The role is offered as a full-time or contract position, with a 1099 contract structure noted in the source. last updated 26 week of 2026