Principal Software Engineer

Microsoft • Mountain View, CA

6d • Hybrid

About The Position

Online Advertising is one of the fastest growing businesses on the Internet today, with about $70 billion of a $600 billion advertising market already online. Search engines, web publishers, major ad networks, and ad exchanges are now serving billions of ad impressions per day and generating terabytes of user events data every day. In the world of LLM with agent flourishing, we are a team of engineers, PMs and designers that is tasked to find and render the ads with most appealing layout, and contribute to the overall bing/MSAN revenue.
To help us achieve our ambitious goals to significantly grow the ads delivering and increase adoption of our MSAN platform, we are looking for a collaborative and seasoned Principal SDE to join our team. The role provides an exciting opportunity to contribute to ads UX and infrastructure for ads serving. If you are excited of joining an entrepreneurial and diverse team to respond to global demand and new scenario and deliver world class product, look no further!
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.

Requirements

• Bachelor's Degree in Computer Science or related technical field AND 6+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience.
• Ability to meet Microsoft, customer and/or government security screening requirements are required for this role. These requirements include but are not limited to the following specialized security screenings: Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.

Nice To Haves

• Master's Degree in Computer Science or related technical field AND 8+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR Bachelor's Degree in Computer Science or related technical field AND 12+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience.
• Previous lead level experience.
• Previous UX design experience.
• Excellent technical design, problem solving and debugging skills.

Responsibilities

• To work with Design/PM/partner teams to come up the suitable UX design
• To build versatile rendering UX package/library on various platform
• To use data processing and monitoring system to analyze the system performance and drive the improvement on full ads stack

What This Job Offers

• Job Type: Full-time
• Career Level: Principal