Jose Marchesi
Software Engineer at Oracle
Frankfurt, Hesse, Germany
Summary
👤
Senior🎓
Top SchoolJose Marchesi is a seasoned software engineer and long-time GNU maintainer with 17 years of professional experience, currently leading the Oracle Toolchain team from Frankfurt to improve and upstream core GNU/Linux development tools such as GCC, binutils and GDB. He combines deep systems-level expertise—particularly in SPARC, x86 and AArch64 architectures—with hands-on compiler backend work, including notable contributions to the GCC BPF backend and BTF support. At Oracle he’s the official SPARC maintainer and has driven ports and optimizations across libc, debugger, elfutils and kernel tooling, reflecting a rare end-to-end toolchain fluency. His background in space and real-time systems (Terma, Deimos) and early work on bootloaders and emulator toolchains gives him practical insight into constrained and safety-critical environments. Colleagues rely on him for pragmatic leadership on complex, low-level problems and for bridging internal product needs with upstream open-source stewardship.
17 years of coding experience
14 years of employment as a software developer
high school, high school at San Isidoro de SevillaBS on Computer Science, Computer Science, BS on Computer Science, Computer Science at Universidad Politécnica de Madrid
Spanish, English
Stackoverflow
46reputation
77reached
1answer
0questions
Github Skills (15)
c1710
c1110
ebpf10
gcc10
compiler-development10
bpf9
assemble9
assembler9
assembly9
optimization8
optimisation8
optmization8
performance-optimization8
machine-learning6
bigml6
Programming languages (9)
Github contributions (5)
gcc-mirror/gcc
May 2020 - Jan 2023
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits in 2 years 8 months
Contributions summary:Jose primarily contributed to the GCC compiler, specifically focusing on the BPF (Berkeley Packet Filter) backend. Their work included fixing typos, removing unused arguments and functions, and implementing features related to BTF (BPF Type Format). The user also addressed issues and optimized code related to BPF instructions, specifically signed division/modulus and byte swap instructions.
gitGNU/gnu_recutils
Oct 2009 - Jan 2017
Contributions:899 commits in 7 years 5 months
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