Senior/Staff JavaScript Developer - Web SDK

Responsibilities

• Lead the development and maintenance of a high-performance Web SDK for collecting and analyzing browser and device-related data.
• Design and implement algorithms for unique device fingerprints and behavior-based insights, including gestures, keyboard, and mouse interactions.
• Build and maintain CI/CD pipelines with automated cross-browser testing and release cycles.
• Optimize SDK performance to minimize resource usage and ensure a seamless user experience.
• Stay current on web technologies, security practices, and industry trends.
• Develop clean, maintainable, and well-documented code.
• Conduct code reviews and mentor junior engineers.
• Collaborate with product managers, designers, and QA engineers.
• Embed data privacy and security principles into the SDK’s design and implementation.
• Drive innovation in browser-based risk, fraud detection, and device analytics solutions.

Requirements

• Proficiency in JavaScript (ES6+), TypeScript, REST APIs, Git, and version control tools.
• Extensive experience designing and maintaining Web SDKs or libraries focused on data collection, tracking, or analytics.
• Deep understanding of browser environments, browser APIs, and efficient browser-data handling.
• Strong knowledge of data privacy, encryption, hashing, and obfuscation techniques.
• Experience building solutions compatible with multiple browsers and devices.
• Familiarity with server-side technologies and RESTful APIs for data retrieval and storage.
• Proficiency with modern build tools such as Webpack, Babel, or Rollup.
• Bachelor’s degree in computer science, software engineering, or a related field, or equivalent experience.
• 8+ years of web development experience, including at least 3 years building and maintaining SDKs.
• Proven contributions to open-source projects or relevant work showcased on platforms such as GitHub.

Nice-to-haves

• Experience with AI-driven analytics, risk systems, or fraud prevention technologies.
• Familiarity with JavaScript SDKs, gestures, and interaction-data processing.
• Experience in high-scale, distributed environments.

Compensation and Benefits

• Competitive salary and equity packages, including a 401(k).
• Remote-first culture.
• Employer-covered comprehensive health, dental, and vision insurance with a top-tier plan for employees and dependents in the US.
• Unlimited PTO.
• AI-first technical environment.
• Family-friendly culture with regular team events and offsites.
• Professional development opportunities.
• Opportunity to help protect online transactions and make the internet safer.