nullptr
Catalonia, Spain
Summary
👤
SeniorAxel Persinger is a founder and CNO engineer with eight years of hands-on offensive security and reverse-engineering experience, currently leading nullptrsec, a boutique firm focused on advanced vulnerability research and exploitation. He has delivered high-impact work across government and commercial clients, from developing custom CTF frameworks and 5G vulnerability research to automating large-scale endpoint threat hunting across 50k+ assets. Axel’s background blends low-level Windows kernel and firmware analysis with pragmatic engineering—building tooling and automation that accelerate vulnerability discovery and exploit development. He’s led small, award-winning teams and consistently translated research into operational capabilities and secure developer environments. Based in Washington, D.C., he pairs a cryptography-and-intelligence-informed CS education with a reputation for rapid prototyping and creative problem solving. A detail that often surprises collaborators: beyond offensive ops he routinely rearchitects production security tooling to improve speed and developer productivity.
9 years of coding experience
Github Skills (36)
qgis10
firmware10
geographical-information-system10
open-source10
water10
usb10
gis10
map-viewer9
api8
fractal-rendering8
avr8
atmel7
imgui7
graphical-user-interface7
qmk7
Programming languages (6)
Github contributions (5)
NullSeile/LinkNeuralNetwork
Nov 2018 - Feb 2021
Contributions:13 commits, 11 pushes, 1 branch in 2 years 3 months
NullSeile/himawari-wallpaper
Feb 2022 - Apr 2026
Contributions:8 pushes, 1 branch in 4 years 2 months
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