Sr./Staff JavaScript Developer, Web SDK

🏢 About Oscilar

Oscilar is an enterprise AI Risk Decisioning platform built to protect digital transactions across fintechs, digital banks, and modern digital ecosystems. Founded by Silicon Valley veterans from Meta, Uber, and Confluent, Oscilar provides real-time fraud detection and risk decisioning at scale.

🎯 The Role

Oscilar is seeking a Staff JavaScript Developer to architect and optimize its core Web SDK. This is a systems-level browser engineering role focused on client-side telemetry, device fingerprinting, and behavioral analytics rather than standard UI feature delivery.

🛠️ Tech Stack

• Core: JavaScript (ES6+), TypeScript, DOM APIs, Browser Internals
• Build & Packaging: Webpack, Rollup, Babel
• Security & Reliability: Cryptographic hashing, Payload obfuscation, Automated cross-browser test suites

💼 What You will Do

• Lead the architecture and continuous delivery of lightweight, resilient browser SDKs.
• Design and implement algorithms for device identification and real-time interaction signals.
• Profile and eliminate CPU/memory overhead to maintain zero perceptible latency for host applications.
• Enforce data protection, privacy-by-design principles, and client-side security safeguards.

✅ What You will Need

• 8+ years of professional web engineering experience with at least 3 years focused on published client SDKs.
• Deep mastery of JavaScript runtime environments, browser internals, and module bundlers.
• Proven expertise delivering cross-browser compatible code across desktop and mobile browsers.
• Strong background in client security, telemetry protection, and performance profiling.