Alexandre Sieira
Co-Founder And CTO at Cybersecurity Canon
São Paulo, Brazil
Summary
👤
Senior🎓
Top SchoolAlexandre Sieira is an entrepreneurial CTO and founder with over 18 years building and scaling security-focused SaaS, managed services and R&D organizations from Brazil to the global market. He combines hands-on engineering—designing cloud-native data pipelines and integrations—with product leadership, having taken Niddel from startup to Verizon acquisition and now leading Tenchi Security’s cloud-centric third-party risk platform. A seasoned speaker and educator, he regularly presents at Black Hat, DEFCON Cloud Village and major regional conferences and teaches AI/ML for security at FIA Business School. Alexandre’s track record spans ISO-certified MSS operations, autonomous threat-hunting products, and pragmatic use of AWS PaaS to process terabyte-scale workloads while controlling costs. He also contributes to open-source tooling (notably enhancements to smart_open) and mentors founders through top accelerators, blending technical depth with strategic deal-making and investor experience. Pragmatic and candid, he focuses on creating transparent, creative teams that turn complex compliance and cloud security challenges into scalable business enablers.
13 years of coding experience
18 years of employment as a software developer
MBA, Business Management, MBA, Business Management at Ibmec Rio de JaneiroPontifical Catholic University of Rio de Janeiro
French, English, Portuguese, Spanish
Stackoverflow
3,613reputation
1.5mreached
20answers
12questions
aggregate
top-5%
r
top-5%
dataframe
top-5%
Github Skills (19)
boto10
python10
filename10
amazon-s310
aws-s310
streaming10
s3-bucket10
r9
aggregate9
dataframe9
bz28
hdfs8
webhdfs8
testing7
system6
Programming languages (15)
Github contributions (5)
piskvorky/smart_open
Nov 2015 - May 2016
Utils for streaming large files (S3, HDFS, gzip, bz2...)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 commits, 3 PRs, 18 comments in 6 months
Contributions summary:Alexandre primarily focused on enhancing the functionality of the `smart_open` library by refactoring existing code and incorporating new features. Their contributions included allowing the direct use of `boto.s3.key.Key` instances, which involved modifying core classes like `S3OpenRead` and `S3OpenWrite`. They also addressed issues related to unknown schemes and updated documentation. Additionally, the user provided test and documentation fixes.
bz2gziphdfspythons3
asieira/vfs2-xz
Feb 2016 - Feb 2021
Apache Commons VFS support for XZ files
Contributions:1 release, 4 PRs, 11 pushes in 5 years 1 month
commonsvfscommons-vfsapacheapache-commons
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