[Remote] Sr./Staff JavaScript Developer - Web SDK

Note: The job is a remote job and is open to candidates in USA. Oscilar is building the most advanced AI Risk Decisioning™ Platform for banks, fintechs, and digitally native organizations. The Staff JavaScript Developer will design, build, and optimize the Web SDK, focusing on device fingerprinting, identity verification, and behavior analytics to enhance fraud prevention capabilities.

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

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
• 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

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
• 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
• Home office setup assistance
• Making the internet safer by protecting online transactions

Company Overview

• The smartest way to make risk decisions. It was founded in 2021, and is headquartered in Palo Alto, California, USA, with a workforce of 201-500 employees. Its website is https://oscilar.com/.

Company H1B Sponsorship

• Oscilar has a track record of offering H1B sponsorships, with 7 in 2026, 8 in 2025, 3 in 2024, 2 in 2023, 1 in 2022. Please note that this does not guarantee sponsorship for this specific role.

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