Sergi Alvarez
Mobile Security Analyst at NowSecure (formerly viaForensics)
Greater Barcelona Metropolitan Area Spain
Summary
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Rockstar🎓
Top SchoolSergi Alvarez is a Mobile Security Analyst with 16 years of deep hands-on experience in reverse engineering, low-level development and firmware analysis, based in the Greater Barcelona area. He combines production security work at NowSecure with prolific open-source contributions to prominent reverse-engineering projects like rizin, capstone and integrations with Ghidra and Frida, where he’s fixed crashes, expanded architecture support and improved CI/build automation. His background spans codecs and embedded firmware to iOS tooling and package creation, reflecting a rare mix of systems-level engineering and practical security insight. Notably, Sergi has improved portability and safety in core tooling—adding V850 and RISC-V support, hardening memory reads, and cross-compiling language toolchains—showing a focus on resilient, cross-platform tooling for analysts.
16 years of coding experience
7 years of employment as a software developer
Higher Education, Application Development, Higher Education, Application Development at Salle GràciaMultimedia, Computer Science, Multimedia, Computer Science at La Salle Bonanova
Catalan, Spanish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (60)
debugging10
debug10
javascript10
docker10
ios10
ghidra10
assembly10
decompiler10
c-language10
dis10
crossbuild10
frida10
it-security10
radare210
linux10
Programming languages (28)
Github contributions (5)
nowsecure/r2frida
May 2015 - Jan 2023
Radare2 and Frida better together.
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:199 releases, 34 reviews, 568 commits in 7 years 9 months
Contributions summary:Sergi focused on enhancing the functionality and security of the `r2frida` project, a tool that integrates Radare2 and Frida. Their work involved rewriting core components, like `bin/r2frida.js`, in JavaScript and restructuring the project by moving JavaScript files into the src folder. They were responsible for addressing build and installation issues. They contributed to fixing issues associated with memory reads to prevent a crash when Frida's Exceptor is buggy. Furthermore, they improved existing functions, features, and tracing aspects.
dynamic-analysisfridaradare2android-securitystatic-analysis
nowsecure/fsmon
Feb 2015 - Jul 2020
monitor filesystem on iOS / OS X / Android / FirefoxOS / Linux
Role in this project:Back-end Developer
Back-end DeveloperContributions:13 releases, 85 commits, 16 PRs in 5 years 5 months
Contributions summary:Sergi contributed significantly to the `fsmon` project, primarily focused on extending its functionality to support Cydia package creation for iOS. Their work involved modifying the build system using `deb.mk` files to generate Debian packages. Furthermore, the user enhanced the event loop and implemented various fixes and improvements within the core codebase, including code cleanup and adjustments to enhance event handling and the integration of different backends.
dynamic-analysismonitorosxwindowstracing
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