Alex Kellermann
Security Engineer at Duolingo
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolAlex Kellermann is a Security Engineer based in New York with 11 years of hands-on experience securing cloud and production environments across companies like Duolingo, Hinge, and MITRE. He specializes in cloud security, vulnerability management, and infrastructure as code—using Terraform, Ansible, and Docker—to build auditable, hardened deployments and drive transitions to Zero Trust architectures. At Hinge he led vulnerability tooling rollouts (Snyk, Rapid7), Splunk log aggregation, and CrowdStrike incident response, while also owning HackerOne triage and remediation. His background includes government-grade work deploying certificate authorities and client-side X.509 management, as well as early forensic and technical analysis experience from an FBI cyber honors internship. Practical and detail-oriented, Alex combines offensive-minded examination skills with pragmatic automation to reduce toil and improve security posture.
11 years of coding experience
4 years of employment as a software developer
Bachelor's degree, Computing Security & Economics, Bachelor's degree, Computing Security & Economics at Rochester Institute of Technology
English, German
Github Skills (40)
syntax10
highlighting10
arctic10
gnu10
text-editing9
spacemacs8
emacs8
palette8
typescript8
melpa8
microsoft7
electron7
vulnerability7
vscode-extension7
vscode7
Programming languages (6)
Github contributions (5)
akellermann97/dotfiles
Nov 2015 - Jun 2018
Contributions:75 commits, 79 pushes, 1 branch in 2 years 6 months
akellermann97/brot-dev
Feb 2024 - Feb 2025
Personal Website
Contributions:1 review, 9 PRs, 40 pushes in 1 year
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