New 
Senior Software Engineer
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 26, 2025 | |
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OverviewOn the Microsoft Defender for Office team (MDO), we are responsible for delivering a cloud-based email and message filtering service that protects customers from advancedthreats (malware, phish, fraud and spam) in Microsoft's email and Teams collaboration workloads. MDO provides investigation,threat huntingand remediation capabilities that allow security teams to efficiently identify, prioritize, investigate, and respond to threats. Security has never been more important at Microsoft, and the Defender for Office (MDO) team operates at the forefront of our company's investments to protect customers as they navigate an ever-changing security landscape. In the MDO team, we focus on detecting malicious activity (malware, phish, fraud and spam), responding rapidly and neutralizing the threat. Our team is seeking a Senior Software Engineer to work in our Foundations organization. You will be responsible for helping build the next iteration of services that will support MDO into the future. This include optimizing our existing architecture for major value savings, embracing new technologies and architectures to enhance MDO's product agility and raising the security & quality bar for the product as a whole. 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.
ResponsibilitiesAs a Senior Software Engineer, you should be:comfortable working in an ambiguous and agile environmentcollaborating with peer engineers in MDO and its partner team across MSEC and Substrate to come up with durable solutions that fulfill customer needsBe the change agent on the team to bring in architectural standards, pave a clear iterative path to get us out of bare metal infrastructure and modernize our hosting architecture. | |