Senior Software Engineer, Web SDK / Frontend Development

Responsibilities

• Lead the long-term evolution of Appier’s Web SDK architecture, strengthening its scalability, modularity, and maintainability to support future product growth
• Design and refine a robust, extensible SDK foundation that can support multiple products, integration scenarios, and enterprise-scale deployments
• Continuously improve runtime performance, bundle efficiency, browser compatibility, and overall stability in diverse client environments
• Contribute to frontend application architecture for enterprise-facing web products, ensuring performance, consistency, and maintainability across shared components
• Identify technical debt and architectural risks early, and proactively implement sustainable improvements rather than short-term fixes
• Safeguard quality through thoughtful testing strategies and thorough code reviews, helping maintain a strong engineering culture
• Support production stability by investigating and resolving client-side issues when needed
• Participate in product and technical roadmap discussions to ensure the SDK platform evolves in alignment with business and platform strategy

About You

[Minimum qualifications]

• 5+ years of experience in frontend or JavaScript engineering
• Strong proficiency in JavaScript (ES6+) and TypeScript
• Deep understanding of browser internals, DOM, HTTP, web standards, and client-side performance optimization
• Experience designing or maintaining JavaScript SDKs, libraries, or shared frontend modules
• In-depth knowledge of front-end frameworks and technologies (e.g., React.js, Vue.js) and their ecosystems**.**
• Solid knowledge of version control (Git) and CI/CD workflows
• Experience writing unit, integration, and end-to-end tests
• Strong problem-solving skills and ownership mindset
• Self-motivated, proactive, and able to collaborate effectively in cross-functional teams
• 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 Node.js, Python, GraphQL, and integrating with various backend services and databases (e.g., MySQL, MongoDB)
• Experience with testing frameworks such as Jest, Vitest, Playwright, or similar
• Experience with cross-browser compatibility and performance tuning in complex browser environments
• Familiarity with web security practices (CSP, XSS mitigation, etc.)
• Experience with micro-frontend architecture

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