Senior Javascript Developer - React

As a Senior Frontend Developer (React.js / Next.js) , you will: Architect and build robust, scalable web applications using React.js and Next.js that make our platform easy and enjoyable to use. Own significant features end to end — from technical design through rollout — and set the standards others build against. Drive frontend performance: server-side rendering, static generation, bundle size, Core Web Vitals, and caching strategy. Collaborate with cross-functional teams to design and implement new features that enhance user engagement. Raise the quality bar through code reviews, refactoring, testing practices, and pragmatic 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 to keep our applications cutting-edge. Requirements Primary Requirements 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 server-side rendering, 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, or equivalent) 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. High attention to detail and strong visualization of UI/UX. Preferred Requirements 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. Soft Skills & Mindset Clear communication and the confidence to challenge and be challenged. Curious, proactive, and generous with knowledge. Ability to work in a fast-paced, collaborative product environment. Strong desire to build real products that solve real problems. Benefits At Stadium, your input matters, and we believe in creating a culture where innovation is encouraged. Join us in crafting the future of group gifting and recognition. Your adventure starts here! Competitive salary based on skill set. Fully remote role - work with talented teammates across the globe. Flexible working hours and autonomy over your schedule. 5-day work week for better work-life balance. Team retreats and offsites to connect and recharge. Meal vouchers and employee benefits (health insurance) support. Internal learning tracks to grow into other areas of development. Plenty of company swag and additional perks.