Sr./Staff JavaScript Developer - Web SDK

Oscilar is building an AI Risk Decisioning platform. We are seeking a Staff JavaScript Developer to design, build, and optimize our Web SDK for device fingerprinting, identity verification, and behavior analytics to help detect fraud.

• 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.

• 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.
• 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.
• 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.
• 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.

• Competitive salary and equity packages, including a 401k
• Remote-first culture — work from anywhere
• Comprehensive health, dental, and vision insurance with a top tier plan for you and your dependents (US)
• Unlimited PTO policy
• AI First company; both Co-Founders are engineers at heart; and over 50% of the company is Engineering and Product
• Family-Friendly environment; Regular team events and offsites
• Unparalleled learning and professional development opportunities
• Making the internet safer by protecting online transactions