TypeScript Engineer, JS Agent

Responsibilities

• Build and maintain the browser-side TypeScript/JavaScript agent used for device identification, bot detection, and risk assessment
• Engineer for stealth, resilience, and performance, ensuring compatibility across various browsers and resisting detection
• Stay ahead of browser changes, plugin behaviors, and evolving fingerprinting techniques
• Collaborate with backend, security, and data science teams to align signal capture with detection logic
• Write comprehensive tests and contribute to CI pipelines to ensure functionality across diverse platforms
• Contribute to a widely-used open-source project with over 27K GitHub stars

Requirements

• 3-5 years of JavaScript and TypeScript experience, specifically in browser environments
• Proven experience building libraries or SDKs for production or developer-facing use cases
• Deep knowledge of browser JavaScript APIs and the ability to write asynchronous code with parallel execution
• Proficiency with build tools such as Vite, Webpack, Rollup, or Esbuild
• Experience with modern testing frameworks like Vitest, Jasmine, or Jest
• Strong understanding of the HTTP protocol and web security principles
• Ability to work independently in a fast-paced, remote environment

Preferred Qualifications

• Experience in complex domains such as media, game development, or security
• History of contributions to open-source projects within the JavaScript/TypeScript ecosystem
• Experience working on technically demanding browser projects (e.g., Figma, Miro, or 3D browser games)

About the Company

Fingerprint empowers developers to stop online fraud at the source. We are a globally dispersed, 100% remote company with a strong open-source focus. Our flagship project, FingerprintJS, is used by millions of developers worldwide to power device intelligence and bot detection.