Sr./Staff JavaScript Developer - Web SDK

The role

You will lead the design, development, and performance optimization of a Web SDK. This role focuses on building SDKs for detecting fraud by analyzing device and behavioral properties.

What you will do

• 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.
• Build and maintain a robust CI/CD pipeline with automated cross-browser testing and release cycles.
• Continuously optimize SDK performance to minimize resource usage.
• Stay updated on emerging web technologies, security practices, and industry trends.
• Develop clean, maintainable, and well-documented code.
• Conduct thorough code reviews and mentor junior engineers.
• Collaborate with cross-functional teams to meet high-quality standards and customer requirements.
• Ensure data privacy and security principles are embedded in the SDK design.
• Drive innovation in browser-based solutions for risk, fraud detection, and device analytics.

Required qualifications

• Bachelor’s degree in computer science, Software Engineering, or a related field (or equivalent experience)
• 8+ years of experience in web development
• At least 3 years focused on building and maintaining SDKs
• Proficiency in JavaScript (ES6+), TypeScript, REST APIs, Git, and version control tools
• Extensive experience designing and maintaining Web SDKs or libraries with a focus on data collection, tracking, or analytics
• Deep understanding of browser environments, APIs, and efficient handling of browser-related data
• Strong knowledge of data privacy, encryption, hashing, and obfuscation techniques
• Experience in building solutions that work seamlessly across various browsers and devices
• Understanding of server-side technologies and RESTful APIs for data retrieval and storage
• Proficiency in modern build tools and frameworks like Webpack, Babel, or Rollup
• Excellent problem-solving abilities
• Strong communication and collaboration skills

Nice to have

• 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
• 401k
• Remote-first culture
• Comprehensive health, dental, and vision insurance with a top tier plan for you and your dependents (US)
• Unlimited PTO policy
• Regular team events and offsites
• Unparalleled learning and professional development opportunities

About the company

Oscilar is building an AI Risk Decisioning™ Platform used by banks, fintechs, and digitally native organizations to manage fraud, credit, and compliance risk.