Sr./Staff JavaScript Developer - Web SDK

Leads design, development, and optimization of Web SDK for device fingerprinting, behavior analytics, and fraud detection using JavaScript and TypeScript. Requires 8+ years web development experience with 3+ years in SDKs, deep browser expertise, and security knowledge.

About the job

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 to create unique device fingerprints and capture behavior-based insights (e.g., gestures, keyboard, and mouse interactions).
Build and maintain a robust CI/CD pipeline with automated cross-browser testing and release cycles.
Continuously optimize SDK performance to minimize resource usage and ensure a seamless user experience.
Stay updated on emerging web technologies, security practices, and industry trends to enhance SDK capabilities.
Develop clean, maintainable, and well-documented code aligned with the best coding practices.
Conduct thorough code reviews and mentor junior engineers on best practices.
Collaborate with cross-functional teams—including product managers, designers, and QA engineers—to meet high-quality standards and customer requirements.
Ensure data privacy and security principles are embedded in the SDK’s design and implementation.
Drive innovation in browser-based solutions for risk, fraud detection, and device analytics.

Technical Skills

Proficiency: JavaScript (ES6+), TypeScript, REST APIs, Git, and version control tools. Web SDK Expertise: Extensive experience designing and maintaining Web SDKs or libraries with a focus on data collection, tracking, or analytics. Browser APIs: Deep understanding of browser environments, APIs, and efficient handling of browser-related data. Security Principles: Strong knowledge of data privacy, encryption, hashing, and obfuscation techniques. Cross-browser Compatibility: Experience in building solutions that work seamlessly across various browsers and devices. Server-side Familiarity: Understanding of server-side technologies and RESTful APIs for data retrieval and storage. Build Tools: Proficiency in modern build tools and frameworks like Webpack, Babel, or Rollup.

Soft Skills

Excellent problem-solving abilities, with attention to detail and a focus on delivering high-quality solutions.
Strong communication and collaboration skills to work effectively in cross-functional teams.
Ability to mentor and provide constructive feedback to junior developers.

Education & Experience

Bachelor’s degree in computer science, Software Engineering, or a related field (or equivalent experience).
8+ years of experience in web development, with at least 3 years focused on building and maintaining SDKs.
Proven track record of contributing to open-source projects or showcasing relevant work on platforms like GitHub.

Preferred Qualifications

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

Benefits

Competitive salary and equity packages, including a 401k.
Remote-first culture — work from anywhere.
100% Employer covered comprehensive health, dental, and vision insurance with a top tier plan for you and your dependents (US).
Unlimited PTO policy.
Family-Friendly environment; Regular team events and offsites.
Unparalleled learning and professional development opportunities.