Senior Javascript Developer - React

🏢 About Stadium

Stadium is a group gifting and recognition platform that builds modern web experiences to make gifting easy and enjoyable. They foster a collaborative, remote-first culture where innovation is encouraged and every team member's input matters.

🎯 The Role

Stadium is looking for a Senior Frontend Developer with deep expertise in React.js and Next.js to architect and build scalable web applications. You will own significant features end-to-end, drive frontend performance, and mentor engineers across the team.

🛠️ Tech Stack

• Core: React.js, Next.js, TypeScript, JavaScript (ES6+), HTML, CSS
• State Management: Redux (or similar)
• Build Tooling: Webpack, Babel
• Performance: Core Web Vitals, SSR, static generation
• Testing (preferred): Jest, React Testing Library, Playwright/Cypress

💼 What You'll Do

• Architect and build robust, scalable web applications using React.js and Next.js
• Own significant features end-to-end from technical design through rollout
• Drive frontend performance: SSR, static generation, bundle size, Core Web Vitals, caching strategy
• Collaborate with cross-functional teams to design and implement new features
• Raise the quality bar through code reviews, refactoring, testing practices, and technical debt reduction
• Mentor mid-level and junior engineers, and help grow the team’s overall frontend capability
• Stay ahead of emerging technologies and best practices in web development

✅ What You'll Need

• 5+ years of professional experience building production web applications with JavaScript
• 5+ years of professional experience with React.js
• Hands-on production experience with Next.js, including SSR, static generation, and routing
• Deep understanding of React concepts: functional components, hooks, state management, context, memoization, rendering behavior, and lifecycle
• Strong command of ES6+, TypeScript, HTML, CSS, and a state management library (Redux or similar)
• Proven experience designing and integrating REST-based third-party APIs
• Demonstrated ownership of frontend performance optimization, debugging, and browser testing
• Experience with modern build tooling (Webpack, Babel) and frontend deployment pipelines
• Track record of leading code reviews, refactoring legacy code, and improving engineering standards
• Strong problem-solving skills with the ability to analyze, clarify, and scope requirements independently

🌟 Nice to Have

• Experience using Google Lighthouse and PageSpeed Insights to drive measurable frontend performance gains
• Knowledge of SEO best practices for server-rendered web applications
• Experience with component libraries, design systems, and monorepo tooling
• Familiarity with automated testing (Jest, React Testing Library, Playwright/Cypress)
• Experience with feature flagging and progressive rollout practices
• Experience working with asynchronous or distributed teams
• Prior experience mentoring developers and leading technical initiatives