Claudio is a security researcher mostly specialized in investigating computer attacks and tracking state-sponsored hacking campaigns. He works as a Senior Technologist and Researcher at Amnesty International, and he's an Adviser to the Citizen Lab, University of Toronto, and a core member of The Honeynet Project. Claudio also co-founded Security Without Borders.

He created the open source malware analysis software Cuckoo Sandbox and Viper and runs the Malwr free service. He published abundant research on botnets and targeted attacks and presented at conferences such as Hack In The Box, BlackHat, Chaos Communication Congress and many more.

In recent years Claudio devoted his attention especially to issues of privacy and surveillance and he published numerous articles on surveillance vendors such as FinFisher and HackingTeam with the Citizen Lab as well as on NSA/GCHQ and Five Eyes surveillance capabilities with The Intercept and Der Spiegel. he also contributes to Global Voices Advocacy. Claudio is also an opinion writer and columnist and some of his work has been published by Die Zeit, Slate and Motherboard.

He has been selected among the 50 persons of the year 2014 by Wired Italy, he received with the Citizen Lab the EFF Pioneer Award 2015, and he's been selected by Forbes among the 30 Under 30 honorees for 2016.

Claudio continuously researches and writes on government surveillance and threats to journalists and dissidents worldwide and supports human rights organisations with operational security and emergency response.