Ryan Rossiter
Senior Software Engineer Team Lead at Microsoft
Redmond, Washington, United States
Summary
👤
Senior🎓
Top SchoolRyan Rossiter is a Senior Software Engineer and team lead with 11 years’ experience building and operating high-scale backend systems, currently driving identity, authorization, and Defender for Endpoint services at Microsoft. He combines hands-on engineering with strong DevOps discipline—designing CI/CD, improving observability, and enabling zero-downtime migrations across Azure regions. Prior work at IBM on SoftLayer and OpenStack (Nova, Magnum) shows deep expertise in cloud networking, API design, and production-grade Python clients, with contributions that improved object versioning, container status handling, and network security group APIs. A pragmatic mentor and TDD advocate, he focuses test coverage and automation where traffic and risk are highest, and has a track record of calming high-pressure incidents through root-cause analysis. Academically grounded with dual BS degrees in Computer Science and Mathematics (4.0 GPA), he blends rigorous thinking with practical systems-building.
11 years of coding experience
5 years of employment as a software developer
Bachelor of Science, Computer Science, 4.0 GPA, Bachelor of Science, Computer Science, 4.0 GPA at South Dakota State University
Github Skills (18)
git10
back-end-development10
apidoc10
python10
object-oriented-programming10
containerization10
openstack10
api10
unit-test10
cli10
testing9
security9
aws-security-group9
network-security-groups9
docker8
Programming languages (8)
Github contributions (5)
softlayer/softlayer-python
Jan 2017 - Jan 2018
A set of Python libraries that assist in calling the SoftLayer API.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:23 commits, 6 PRs, 26 comments in 1 year
Contributions summary:Ryan focused on enhancing the SoftLayer Python library and its command-line interface (CLI). They updated the CLI documentation, added new security group functionalities, and integrated these features into the CLI commands, including adding rule management and interface attachments. They also implemented improvements to the detail and interface listing commands to handle permission issues. Further, they updated the codebase by implementing and testing new API endpoints related to order placement and category listing and fixed displaying values from the SL API.
pythonsoftlayer
openstack/nova
Jun 2015 - Feb 2017
OpenStack Compute (Nova). Mirror of code maintained at opendev.org.
Role in this project:Back-end Developer
Back-end DeveloperContributions:38 commits in 1 year 8 months
Contributions summary:Ryan's commits focus on enhancing object relationships and versioning within the OpenStack Nova compute service. They refactored and corrected object relationships to include list objects, addressing dependency issues. The user also made significant changes to ensure object relationships are tested correctly and that subobject versions align with parent object versions, improving the overall stability and maintainability of the Nova code base. The user also added tests to verify that object relationships are kept at or below the current versions of the objects.
openstack
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