Sr./Staff JavaScript Developer - Web SDK (Brazil/Canada/UK/Poland/India)

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

• 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.
• 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.

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
• 100% Employer covered comprehensive health, dental, and vision insurance for you and dependents (US)
• Unlimited PTO policy
• Regular team events and offsites
• 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.