Senior Frontend Developer

An interactive online entertainment platform delivers a portfolio of browser-based games and real-time features to a rapidly expanding user base. The system addresses challenges of high traffic, low-latency updates, and secure micro-transactions within a social gaming context. It operates a hybrid technology stack that includes a mature codebase built on a widely used DOM-manipulation library alongside modern React and Next.js frameworks. Key technical hurdles include migrating legacy components to a modular architecture, implementing WebSocket-based real-time interactions, ensuring mobile and cross-browser consistency, and integrating payment flows and promotion management interfaces. Strong engineering leadership is essential to maintain stability, drive performance optimizations, and accelerate feature delivery at scale.

• 6+ years of frontend development on high-load, production-grade projects
• Deep expertise in jQuery and maintaining legacy codebases
• Strong React.js skills (Hooks, functional components, context, custom hooks)
• Proficiency with Next.js (SSR, SSG, App Router, API routes)
• Mastery of CSS/SCSS, responsive design, CSS Grid, and Flexbox
• Fluency in modern JavaScript (ES6+) and TypeScript
• Experience with asynchronous programming patterns and WebSocket integration
• Proven performance optimization techniques, including bundle analysis and Core Web Vitals
• Familiarity with build tools such as Webpack, Vite, and Gulp
• Expertise in RESTful API integration and front-end security best practices
• Experience resolving cross-browser compatibility and debugging issues
• Knowledge of state management libraries (Redux, MobX, or equivalents)
• Proficient with Git and collaborative development workflows
• Excellent communication skills and proven ability to work autonomously in cross-functional teams

Nice to have:

• Experience with gradual TypeScript adoption in large codebases
• Basic familiarity with PHP for backend integration
• Experience with testing frameworks (Jest, React Testing Library, Cypress)
• GSAP for advanced animations and interactive UI elements
• Proficiency with design tools (Figma, Zeplin, Photoshop, Sketch)
• Understanding of CI/CD pipelines and DevOps fundamentals
• Awareness of SEO best practices and web analytics
• Exposure to mobile hybrid frameworks (e.g., Cordova)

• Enhance and optimize existing jQuery interfaces for performance, stability, and maintainability
• Develop responsive, scalable applications using jQuery, React, and Next.js
• Refactor and modularize large CSS/SCSS architectures to support maintainability and scalable theming
• Ensure high-quality mobile user experience and cross-browser compatibility
• Maintain and extend WebSocket integrations for real-time updates
• Implement front-end security measures, including input validation and secure coding patterns
• Design and define React component architecture to guide progressive migration efforts
• Integrate RESTful APIs and Next.js API routes, coordinating closely with backend services
• Establish performance benchmarking, automated testing, and build pipelines with tools like Vite, Webpack, or Gulp
• Architect centralized state management solutions using Redux, MobX, or similar libraries
• Collaborate with designers to translate UI/UX prototypes into production-ready code
• Develop business-critical features such as payment flows, authentication systems, and promotion management interfaces