[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 and fintechs. They are seeking a highly skilled Staff JavaScript Developer to design and optimize their Web SDK, which will be essential for device fingerprinting and identity verification in fraud prevention.

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
• 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 1 in 2026, 9 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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