Senior Frontend Development Engineer (Enterprise Solutions)

About Appier Appier 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 role Frontend engineers at Appier focus on handcrafting sophisticated web UI using cutting-edge front-end development technologies / tools. We work closely with UI/UX designers and backend engineers and deliver high-quality, fluent and elegant web applications to our enterprise customers, or to aid daily operations within Appier. [The seniority/title is determined by job-related skills, experience, and evaluation after the interview.] Responsibilities Design & develop front-end architecture & interactive user interfaces Work closely with backend engineers to integrate services, and contribute to building lightweight RESTful APIs when necessary to support frontend functionality Ensures the flexibility of front-end architecture and the high performance of responsiveness Build reusable code and UI design systems for cross-product consistency and scalability Write unit, integration, and end-to-end tests to ensure code quality Perform code reviews to ensure existing code stay high-quality, fast, and flexible Handle and resolve issues escalated from the production operational environment Participate in idea brainstorming and contribute ideas to technology, algorithms and products About you [Minimum qualifications] 3+ years of experience in software development Good knowledge of HTTP, CSS, modern JavaScript (ES6+ / ECMAScript 2015+), TypeScript, HTML, DOM, and web standards Respect coding convention, language standard syntax, documentation In-depth knowledge of front-end frameworks and technologies (e.g., React.js, Vue.js) and their ecosystems . Proactive, good interpersonal and problem-solving skill Self-motivated, proactive, and a strong team player Solid understanding of version control (Git) and CI/CD workflows Experience leveraging AI-assisted development tools (e.g., GitHub Copilot, Cursor, Windsurf) to accelerate coding, debugging, and refactoring. Familiarity with these tools is expected as part of our team’s daily development workflow. Passion for clean code, scalability, and performance, curious about new technologies and enthusiastic about developer experience [Preferred qualifications] Familiarity with modern build tools and bundlers (e.g., Babel, Webpack, Vite, Rspack, esbuild, etc.) Experience in CSS Pre/Post-processors (PostCSS, SASS or LESS) or modern CSS solutions (e.g., CSS Modules, Tailwind CSS, Styled Components). Experience in Node.js, Python, GraphQL, and integrating with various backend services and databases (e.g., MySQL, MongoDB) Experience with testing frameworks such as Jest, React Testing Library, Vitest, or Playwright Experience building or integrating SDKs or capable of developing across multiple browsers, platforms Experience in web performance optimization Familiarity with micro-frontend architecture Experience with data visualization #LI-TC1