Haken Lead SDK Engineer Web Mobile Tokyo JavaScript
About the job
Join a global technology leader operating one of the largest internet ecosystems, where billions of events are processed daily. As a Lead SDK Engineer, you will develop and optimize mission-critical JavaScript/TypeScript SDKs for web and mobile platforms, contributing to a high-scale analytics environment. This role offers the opportunity to work in an international, English-speaking environment while building cutting-edge developer tools and data-driven solutions.
Key Responsibilities
- Lead the development and maintenance of high-traffic JavaScript SDKs for web and React/TypeScript environments
- Architect and enhance analytics tools such as Chrome extensions to improve developer experience
- Collaborate with Android, iOS, and Web teams to ensure cross-platform integration and compatibility
- Conduct code reviews to maintain high standards of quality and performance
- Partner with Product Managers to translate requirements into scalable, high-performance features
Required Skills and Qualifications
Experience:
- 5+ years of professional experience in JavaScript and TypeScript, focused on Web SDK development
- Proven experience leading and maintaining SDKs or developer tools at scale
- Strong experience with modern frameworks such as React, Angular, or Vue.js and build tools like Vite or Webpack
Soft Skills:
- Strong problem-solving skills with the ability to debug complex distributed systems
- Collaborative mindset with the ability to work across cross-functional global teams
- Excellent communication skills to explain technical concepts clearly
Language Requirements:
- Japanese: Basic level
- English: Fluent
Preferred Skills & Qualifications
- Experience with Agile development and testing frameworks such as Playwright
- Experience developing Chrome Extensions or cross-platform applications (e.g., Electron)
- Knowledge of data analytics systems and large-scale data pipelines
About the Company
Our client is a global technology leader operating a vast internet service ecosystem, connecting millions of users through a wide range of digital services. Their Analytics & Metrics Department processes over two billion events daily, offering engineers the opportunity to work on large-scale data systems in a highly innovative and international environment.
Why You'll Love Working Here
- Work in a global, English-speaking engineering environment
- Exposure to large-scale data processing and advanced analytics systems
- Flexible hybrid working model with work-from-home options
- Modern office environment with casual dress code and employee food facilities
- Transportation allowance and strong employee support benefits
Don't Miss Out - Apply Now!
