The device identity platform for high-scale applications. Powered by the world's most accurate visitor identifier.
Senior Software Engineer – Javascript/Typescript
Location
United States
Posted
70 days ago
Salary
$150K - $200K / year
Seniority
Senior
Job Description
Senior Software Engineer – Javascript/Typescript
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• 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
Job Requirements
- 3-5 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 Vite, Webpack, Rollup, Esbuild, including code obfuscation and minification
- Experience with modern testing frameworks such as Vitest, 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 options
- Professional development opportunities
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