Sr./Staff JavaScript Developer - Web SDK

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sr./Staff JavaScript Developer - Web SDK based in Brazil. This role offers the opportunity to shape a high-performance Web SDK at the intersection of JavaScript, browser technology, security, and fraud prevention.You will design and optimize technology that collects browser, device, and behavioral signals to help organizations make smarter risk decisions.The position requires deep knowledge of web platform internals rather than traditional UI or application development.You will work across engineering, product, design, and QA teams to deliver secure, scalable, and developer-friendly solutions.As a senior technical contributor, you will influence architecture, performance, engineering practices, and SDK capabilities.You will also contribute to innovation in device intelligence, identity verification, behavior analytics, and risk technology.This is a remote opportunity for an experienced engineer who enjoys solving complex technical challenges with meaningful real-world impact.