Software Engineer II

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We are looking for a skilled Frontend Software Engineer II with a solid focus on user security and client‑side bot detection.This role will focus on designing and implementing browser‑side instrumentation, fingerprinting, and telemetry
to 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.

Required Qualifications:

• Bachelor's Degree in Computer Science or related technical field AND 2+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
  • OR equivalent experience.
• 4+ years frontend engineering experience in modern JS frameworks.
  
• Solid understanding of browser APIs, event loop, and security best practices.
  
• 2+ years of experience with analytics, telemetry, or client‑side instrumentation.

Preferred Qualifications:

• 2+ years of experience in anti‑fraud, CAPTCHA, or fingerprinting technologies.

Software Engineering IC3 - The typical base pay range for this role across the U.S. is USD $100,600 - $199,000 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $131,400 - $215,400 per year.

Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here: https://careers.microsoft.com/us/en/us-corporate-pay

Microsoft will accept applications for the role until November 11, 2025.

#MicrosoftAI #BING

• Develop lightweight JavaScript/TypeScript modules for user‑interaction 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.