Senior React Developer

Job Title: Senior React DeveloperLocation: San Leandro, CA Type: Contract Role OverviewWe’re seeking a Senior React Developer with a strong programming background to lead the design and implementation of high-quality, performant front-end applications. You will shape UI architecture, mentor engineers, and collaborate closely with product, design, and backend teams to deliver resilient, accessible, and scalable user experiences.Key ResponsibilitiesLead front-end architecture and develop complex, reusable React components and hooks.Drive state management patterns (e.g., Redux) and ensure predictable data flows in large applications.Integrate REST APIs, handle JSON payloads, and optimize network interactions.Enforce coding standards, conduct code reviews, and improve test coverage with Jest/React Testing Library/Enzyme.Partner with designers to implement responsive, accessible UIs using HTML5, CSS3/SASS, and component libraries (e.g., Material UI/React Bootstrap).Champion performance and accessibility best practices; instrument and debug with modern browser tools.Collaborate in Agile ceremonies; help define stories, acceptance criteria, and release plans.Required Qualifications6–10+ years of professional software development, with 4+ years focused on React.js at scale.Expert-level JavaScript/TypeScript and deep knowledge of ES6+ patterns and React internals. ,Proven experience with Redux, component composition, custom hooks, and performance optimization. ,Strong front-end engineering fundamentals: semantic HTML, modern CSS, responsive design, and accessibility (WCAG/ADA).Hands-on testing experience (unit, integration, E2E) with Jest/RTL/Enzyme; CI integration. ,Proficiency with Git and common workflows; comfort with Agile/Scrum delivery.Preferred QualificationsFamiliarity with Next.js, charting/grid libraries (e.g., agGrid, Recharts/Highcharts), and modern build tooling.Experience collaborating with cross-functional teams in regulated or enterprise environments.