Senior Typescript Engineer

Summary

Join Fingerprint as a Senior TypeScript Engineer and lead the development of browser-based technologies, including the JavaScript agent, Pro CDN, and other performance-critical components. Build high-integrity, privacy-aware, and tamper-resistant code that runs across diverse browser environments. Contribute to a widely-used open-source project with 24K+ GitHub stars and 25B+ monthly usages. Engineer for stealth, resilience, and performance, minimizing footprint and resisting detection. Stay ahead of browser changes and collaborate with backend, security, and data science teams. Write comprehensive tests and contribute to CI pipelines. This role requires expert-level JavaScript and TypeScript experience, a deep understanding of browser APIs, and proficiency with build tools. The ideal candidate will possess strong ownership, autonomy, and communication skills.

Requirements

• Expert-level JavaScript and TypeScript experience, especially in browser environments
• Deep understanding of browser APIs, DOM behavior, timing attacks, and anti-debugging techniques
• Proficiency with build tools like Webpack, and (or) Rollup, Esbuild, including code obfuscation and minification
• Experience with modern testing frameworks such as Jasmine, Jest, or similar
• Strong sense of ownership and autonomy—comfortable working in fast-paced environments without rigid specifications
• Clear written and verbal communication skills in English
• Familiarity with security principles, privacy best practices, and adversarial engineering
• High level of personal ownership and autonomy, which requires experience working without clearly defined requirements

Responsibilities

• Build and maintain our browser-side TypeScript/JavaScript agent used for device identification, bot detection, and risk assessment
• Contribute to a widely-used open-source project with 24K+ GitHub stars and 25B+ monthly usages
• 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

Preferred Qualifications

• Contributions to open-source projects, especially in the JavaScript/TypeScript ecosystem
• Experience with WebAssembly, browser extensions, or remote debugging
• Familiarity with AWS services such as Lambda, CloudFront, and DynamoDB
• Browser automation experience