PerplexityMember of Technical Staff
Jan 2026 — Present
Works on platform architecture and engineering standards; designed the SPACE stateful execution architecture and led its technical direction.
Zibi Braniecki builds platform architecture at Perplexity, drawing on systems work at Amazon Lab126 and Mozilla. He co-created Fluent, helped found ICU4X, and contributes to JavaScript internationalization and Unicode standards.
Zibi Braniecki builds platform architecture at Perplexity, drawing on systems work at Amazon Lab126 and Mozilla. He co-created Fluent, helped found ICU4X, and contributes to JavaScript internationalization and Unicode standards.
Career
Unicode ConsortiumTechnical Committee Contributor
Sep 2019 — Present
Standards work through ICU4X and the MessageFormat working group. Co-founder and vice-chair of the ICU4X Technical Committee; a concurrent standards affiliation.
Ecma InternationalInvited Expert
Jun 2015 — Present
Contributes to the ECMA-402 internationalization and ECMA-262 JavaScript standards work groups.
Amazon Lab126Principal Engineer, Vega OS
Jan 2023 — Dec 2025
Led architecture and systems design for runtime infrastructure and the developer platform for Vega OS. Previously worked on Alexa as an Amazon principal engineer from January 2022.
MozillaWeb Engine Platform Tech Lead Manager
Jan 2021 — Jan 2022
Led internationalization architecture for Gecko and work across ICU4X, Fluent, ECMA-402 and MessageFormat. Earlier Mozilla engineering roles date to February 2008.
aviary.plFounder and Project Leader
Sep 2004 — Jan 2018
Founded the Polish localization community for Mozilla and other open-source projects, including Firefox, Thunderbird and OpenSUSE.
University of WarsawInstructor
Apr 2012 — Nov 2012
Taught a Mobile Media seminar in the Faculty of Journalism for undergraduate and graduate students.
Mozilla EuropeBoard Member
Jul 2005 — Dec 2011
Supported Mozilla localization, community outreach and open-source development as a board member.
Flock (web browser)Community Ambassador
Aug 2006 — Jan 2008
Built localization and developer communities for the Flock browser; previously worked there as a software engineer.
Cosigns Received
Featured Media
linkedin.com
SPACE: Building a Stateful Execution Platform at Perplexity
An account of designing SPACE, the stateful execution architecture he led at Perplexity, and the engineering decisions behind the platform.
linkedin.com
The origin of annotate-snippets
His account of creating the Rust diagnostic-formatting library in 2018, with credit to Scott Schafer for its later compiler integration.
linkedin.com
Joining Perplexity
Why he joined Perplexity and how his experience building foundational software informs his approach to AI infrastructure.