Senior Frontend Developer (Playable Ad team)

About AppierAppier is a software-as-a-service (SaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information.About The RoleWe are looking for a **Senior Frontend Developer** with strong technical expertise and a leadership mindset to join our frontend team. This role involves taking initiative in software development processes, architecting scalable UI systems, and guiding the team with best practices in code quality and performance.The ideal candidate is detail-oriented, passionate about frontend architecture, and experienced in delivering high-performance, maintainable interfaces using modern technologies.[The seniority/title is determined by job-related skills, experience, and evaluation after the interview.]Responsibilities Lead the **frontend architecture** in new projects and play an active role in key technical decisions Contribute to defining and maintaining **technical standards** across the team Drive refactoring and continuous improvement efforts to ensure codebase maintainability Collaborate with product and design teams to deliver **user-centric** solutions Own and uphold the **code review** process to ensure high-quality and consistent code Build **accessible**, **performant**, and **reusable UI components** that scale Apply advanced optimization strategies to ensure all UI components, especially third-party or interactive content, load efficiently and perform smoothly across a wide range of devices, browsers, and embedded environments (e.g., webviews).About You[Must-Have Technical Skills] Advanced proficiency in JavaScript (ES6+) and TypeScript At least **4 years of experience** with **React.js**, including Hooks, Context API, and robust state management approaches Experience in **component-based architecture** (e.g., Atomic Design) Strong styling skills with **SCSS** and/or **Tailwind CSS** Deep understanding of build tools like **Vite** (Webpack or Rollup experience is a plus) Proficient in version control with **Git** and active participation in PR/code review workflows Solid experience integrating with **RESTful APIs** Hands-on expertise in **performance optimization techniques** such as lazy loading, memoization, code splitting, and re-render control[Nice-to-Have] Experience building or contributing to a **design system** or **component library** Involvement in **technical decision-making processes** Proven ability to collaborate effectively with **UI/UX teams** throughout the design and development lifecycle Experience with performance tuning for **third-party scripts**, **advertising content**, or other **resource-intensive components**.[Personal Attributes] Strong awareness of **code quality** and **software sustainability** Proactive mindset with the ability to identify technical bottlenecks and take initiative Comfortable with both **written and verbal technical communication in English** Product ownership attitude with a focus on **user experience and usability**