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Lead JavaScript SDK Engineer (Web)

TEKsystems

3.6
302 reviews
TEKsystems
Job Type   /   Job Level
Contract   /   Others/Any
Job Location
Tokyo, Tokyo, Japan
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  • Work on a platform that impacts multiple products and services at scale
  • Strong opportunities for professional growth through collaboration and modern technologies
  • Experience with large-scale analytics, data engineering, and developer tooling

Lead JavaScript SDK Engineer (Web) | Analytics Platform

Work Arrangement: Hybrid

Experience Level: 5+ years

Interview Rounds: 1

About The Role

We are looking for a Lead JavaScript SDK Engineer (Web) to take ownership of web-based SDKs and developer tools that power a large-scale analytics platform.

This is a business-critical role requiring strong hands-on SDK expertise to ensure high performance, seamless integration, and excellent developer experience across multiple web environments.

The platform aggregates and analyzes massive volumes of online and offline data, supporting analytics and data-driven decision-making across multiple services and products.

Why This Role Is Open

  • This is a high-priority, newly opened role due to the growing importance of the analytics platform
  • Immediate hands-on SDK expertise is required to support multiple services and integrations
  • The role directly impacts platform stability, performance, and developer experience

What You Will Do

  • Lead the development and maintenance of JavaScript SDKs for web applications
  • Enhance and maintain React / TypeScript SDKs, including migration of legacy SDK components
  • Build and improve developer tools, including a web-based analytics debugger and related tooling
  • Collaborate closely with Web, Android, and iOS engineers to ensure cross-platform compatibility
  • Drive design and implementation decisions to improve developer experience and integration usability
  • Conduct code reviews, enforce best practices, and maintain high code quality standards
  • Work closely with Product Managers to gather requirements and prioritize feature development
  • Partner with architects to resolve complex integration or performance issues

How Success Is Measured

  • Seamless SDK integration across platforms and environments
  • High code quality, maintainability, and test coverage
  • Improved developer experience and reduced integration friction
  • Fast and effective resolution of SDK and integration issues

Top Skills Required

  • JavaScript (Expert): Strong experience building and maintaining SDKs for web applications
  • SDK Development: Deep understanding of SDK design, versioning, compatibility, and integration
  • React.js: Experience migrating legacy SDKs and building modern developer-facing tools

Required Qualifications

  • 5+ years of professional experience with JavaScript and TypeScript, focused on web SDK development
  • Proven experience leading the development and long-term maintenance of SDKs or internal libraries
  • Strong experience with modern JavaScript frameworks such as React (Angular or Vue.js experience is a plus)
  • Experience writing unit tests using Jest or similar testing frameworks
  • Hands-on experience with build tools such as Vite or Webpack
  • Strong debugging, problem-solving, and performance optimization skills
  • Excellent communication and collaboration skills in cross-functional teams
  • Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience

Nice to Have

  • Experience with Agile development methodologies
  • Experience developing Chrome Extensions, Electron apps, or cross-platform developer tools
  • Familiarity with data analytics and data collection principles
  • Experience with Playwright or other automated testing frameworks
  • Contributions to open-source projects or active participation in developer communities
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