Rossen Atanassov
Director Of Engineering, Microsoft Defender For Endpoint at W3C
Greater Seattle Area United States
Summary
🤩
Rockstar🎓
Top SchoolRossen Atanassov is a veteran engineering leader with 14+ years shaping web platform and security products at Microsoft, currently directing cloud engineering for Microsoft Defender for Endpoint to protect over a billion devices. He previously led Edge’s core presentation stack—CSS, SVG, HTML and accessibility—driving major initiatives like full accessibility support and high-contrast rendering while shipping features such as CSS Grid and variables. As co-chair of the W3C CSS Working Group and active contributor to SVG and ARIA standards, he pairs product-scale engineering with deep standards-level craftsmanship, including hands-on technical writing for widely referenced W3C repos. Known for shifting the “physics of security” and enabling inclusive web experiences, he blends cross-platform technical depth with a people-first leadership style. Outside work he’s an athlete and drummer, reflecting an energetic, disciplined approach to problem solving.
14 years of coding experience
17 years of employment as a software developer
BCS Computer Science, BCS Computer Science at Carleton University
Github Skills (3)
css10
xml10
documentation10
Programming languages (4)
Github contributions (5)
w3c/csswg-drafts
Oct 2011 - Oct 2022
CSS Working Group Editor Drafts
Role in this project:
Technical Writer
Technical WriterContributions:37 commits, 5 PRs, 10 pushes in 11 years 2 months
Contributions summary:Rossen's commits primarily focused on updating the CSS Exclusions and Shapes Module Level 1 specification. The contributions include correcting grammatical errors, refining example code, and modifying wording for clarity. The user's work directly improves the quality and readability of the specification for developers. Furthermore, the edits suggest a focus on maintaining consistency and accuracy within the document.
cssworking-groupdrafts
w3c/svgwg
Jun 2015 - Feb 2016
SVG Working Group specifications
Role in this project:Technical Writer
Technical WriterContributions:19 commits, 17 pushes in 8 months
Contributions summary:Rossen primarily contributed to documentation within the SVG Working Group repository. Their commits involve modifying and updating the specification documents, specifically addressing issues related to element definitions, geometry properties, and the use of "initial" values. They also updated the editor's list and made minor editorial fixes, demonstrating their focus on maintaining and improving the clarity and accuracy of the SVG specification.
svgrsvgosvgwavemorph
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