New 
Software Engineer II
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 31, 2025 | |
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OverviewWe are looking for a skilled Frontend Software Engineer II with a solid focus on user security and clientside bot detection.This role will focus on designing and implementing browserside instrumentation, fingerprinting, and telemetryto distinguish between human and automated behavior, ensuring high accuracy and minimal UX impact. Microsoft's mission is to empower every person and every organization on the planet to achieve more. As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond. Starting January 26, 2026, Microsoft AI (MAI) employees who live within a 50- mile commute of a designated Microsoft office in the U.S. or 25-mile commute of a non-U.S., country-specific location are expected to work from the office at least four days per week. This expectation is subject to local law and may vary by jurisdiction.
ResponsibilitiesDevelop lightweight JavaScript/TypeScript modules for userinteraction telemetry and anomaly detection.Integrate detection SDKs into web and mobile frontends (React, Angular, Vue).Collaborate with backend engineers to define APIs and data contracts for telemetry ingestion.Optimize performance for minimal latency and CPU impact.Implement security hardening techniques against headless browsers and automation frameworks.Debug detection coverage issues and improve signal reliability across browsers and devices. | |