Senior Frontend Development Engineer

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 UIs and ad content using cutting-edge front-end development technologies and tools. We collaborate closely with designers and backend engineers to deliver high-quality, smooth, and elegant web applications for the advertising domain as well as support daily operations within Appier. [The seniority/title is determined by job-related skills, experience, and evaluation after the interview.] Responsibilities Design and develop reusable advertising UI components (e.g., banners, video ads) and supporting systems using modern JavaScript frameworks and AI-powered tools. Build and maintain a modular JavaScript library or SDK to ensure scalable, consistent, and easily integrated ad rendering and tracking. Optimize ad content performance through efficient loading strategies and responsive design. Develop integrations with external SSP platforms, ensuring compliance with technical standards. Implement and manage analytics tools to monitor user interaction and ad effectiveness, delivering actionable insights. Participate in brainstorming sessions, contributing innovative technical solutions across UI/UX, algorithms, and product development. Utilize AI-powered development tools (e.g., GitHub Copilot, Tabnine, Cursor) to enhance coding efficiency and maintain code quality. About you [Minimum qualifications] Solid understanding of HTML, CSS, JavaScript, TypeScript, DOM, HTTP and web standards. Knowledge of modern front-end frameworks like React, Vue, Svelte. Experienced in integrating with REST APIs and GraphQL Experienced with bundler: Vite, Webpack, esbuild, and Rollup. Familiarity with Git for version control. Experience ensuring cross-browser compatibility. Practice coding conventions, syntax standards, and thorough documentation. Shows initiative and strong interpersonal skills in problem-solving. Ability to work effectively both independently and as part of a team. [Preferred qualifications] Explores and shares insights on AI tools like GitHub Copilot, Tabnine, Cursor, and AI-driven testing to enhance front-end development and code quality. Experienced with meta frameworks like: Next.js, Nuxt.js, SvelteKit. Experienced with CSS-in-JS, PostCSS, SASS, and Tailwind CSS. Skilled in Jest, React Testing Library, Cypress, and Playwright for testing. Experienced in web performance optimization using Core Web Vitals, Lighthouse, WebPageTest, and Chrome DevTools. Experienced in debugging on any web environments like webview or browser. Experienced in server-side JavaScript runtime: Node.js, bun, deno. Experienced with relational databases or NoSQL databases. Familiar with CI/CD tools (GitHub Actions, Jenkins, Bitbucket) and Docker. #LI-TC1