JavaScript / TypeScript Engineer

Description

• Build and maintain our browser-side TypeScript/JavaScript agent used for device identification, bot detection, and risk assessment • Engineer for stealth, resilience, and performance—minimizing footprint, resisting detection, and maintaining compatibility across browsers • Optimize for both code size and execution speed in complex, adversarial environments • Stay ahead of browser changes, plugin behaviors, and 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 that ensure functionality across a wide range of platforms and devices • Contribute to a widely-used open-source project with 24K+ GitHub stars and 25B+ monthly usages

Requirements

• 6-10 years of JavaScript and TypeScript experience, especially in browser environments • Deep understanding of browser APIs, DOM behavior, timing attacks, and anti-debugging techniques • Experience building libraries or SDKs, especially for production or developer-facing use cases • Strong frontend experience (~80%), with backend familiarity (~20%) • Proficiency with build tools like Webpack, Rollup, Esbuild, including code obfuscation and minification • Experience with modern testing frameworks such as Jasmine, Jest, or similar • Familiarity with security principles, privacy best practices, and adversarial engineering • Comfortable working in fast-paced environments without rigid specifications • Strong sense of ownership and autonomy; you enjoy working independently and solving hard technical problems • Clear written and verbal communication skills in English.

Benefits

• Remote work • Competitive salary • Professional development opportunities • Flexible working hours • Inclusive work environment

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