Hi, I am

JesúsBlázquez

~$ Systems Programmer

I build things at the low level: memory allocators, network servers, and the protocols underneath. When I break something, it is (usually) on purpose.

Read the CV View work

about

About

I am a Computer Science and Mathematics student at the Universidad Autónoma de Madrid (UAM), working at the intersection of low-level systems programming, open-source development, and security research.

At INSAIT I fuzzed the I2P anonymity network, found CVE-2026-88757 in i2pd, and built it into a remote de-anonymization attack now under submission. I also contribute floating-point arithmetic to FreeBSD's libm and build networking, memory-management, and HTTP tooling from scratch in C and C++.

I am looking for opportunities in security research and systems engineering, where rigor in low-level code and mathematics both matter.

Currently: pushing C23 float routines into FreeBSD libm and writing up the I2P de-anonymization paper (PoPETs submission).

experience

Where I've worked

  1. Research Fellow :: SURF 2026

    INSAIT · Sofia, Bulgaria

    June – August 2026

    Selected for the SURF program to research vulnerabilities in the I2P anonymity protocol.
    • Fuzzed the C++ i2pd implementation and found CVE-2026-88757, a remote, deterministic null-pointer dereference in the ECIES-X25519-AEAD ratchet session handling.
    • Turned the crash primitive into ACCORD, a remote de-anonymization attack validated against the live I2P network.
    • Supervised by Dr. David Basin and Ms. Nadia Markova; co-authoring a paper under submission to PoPETs.

projects

Things I have built or broken

A directory. Open an entry to read the log, the stack, and the writing behind it.

jesus@blazquez: ~/projects

$ ls -l ~/projects

  • drwxr-xr-x posthaste/ * C · epoll · Lock-Free · Networking

    $ cat posthaste/README.md

    A from-scratch HTTP/1.1 library and server: an epoll reactor, a bounded lock-free MPMC queue, and a worker thread pool. The write-up covers the architecture and a subtle response-framing bug that only appeared behind Nginx.

    # related writing Building a C++17 HTTP Server with Linux epoll

    Source

  • drwxr-xr-x freebsd-libm/ C · FreeBSD · Numerics · Open Source

    $ cat freebsd-libm/README.md

    Upstream contributions to FreeBSD's math library, implementing C23 floating-point routines with attention to correctness across rounding modes and edge cases.

    Commits

  • drwxr-xr-x memory-allocator/ C · Memory Management · Systems

    $ cat memory-allocator/README.md

    A drop-in dynamic memory allocator implementing the malloc/free/realloc interface, written to understand heap layout, free-list strategies, and fragmentation from first principles.

    Source

  • drwxr-xr-x i2p-accord/ * I2P · C++ · Fuzzing · Security Research

    $ cat i2p-accord/README.md

    Research from my INSAIT fellowship: a null-pointer dereference in i2pd's ECIES-X25519 ratchet became a remote crash primitive, then a full de-anonymization attack against hidden services on the live network. Paper under submission to PoPETs.

  • drwxr-xr-x homelab/ Linux · Docker · Networking · SysAdmin

    $ cat homelab/README.md

    An always-on homelab where I run services behind reverse proxies and VPNs, manage containers, and treat my own infrastructure as a practice ground for networking and systems administration.

  • drwxr-xr-x dos-workshop/ Docker · Networking · Security

    $ cat dos-workshop/README.md

    A Docker-based lab for hands-on study of application-layer denial-of-service techniques and their mitigations, in a safe, reproducible environment.

    Source

$

education

Studies

Double Degree in Computer Science and Mathematics Present Universidad Autónoma de Madrid Dual-degree program combining CS systems foundations with rigorous mathematics.
  • Data Structures and Algorithms
  • Memory Management and Systems Architecture
  • Applied Mathematics
Professional Degree in Music (Oboe) 2013 – 2023 Conservatorio Tomás de Torrejón y Velasco A 10-year degree demonstrating high-level discipline, performance under pressure, and long-term commitment.

recognition

Achievements

Regional Mathematical Olympiads 2018
Silver Medal (Albacete) and Bronze Medal (Castilla-La Mancha) in regional mathematical competitions.
Academic Excellence Scholarship 2024
Awarded by the Community of Madrid and UAM for maintaining a GPA within the top percentile of the cohort.

writing

git log --author=jesus

all posts
  1. d61145cBuilding a C++17 HTTP Server with Linux epoll#C++#Networking#epoll

contact

Contact

If you want to discuss systems programming, security research, or open-source projects, feel free to reach out. You can also find me on Libera.Chat.

jesuscblazquez@gmail.com
IRC
rotten_egg on Libera.Chat
PGP
1BC8 3469 6F33 43B0 7B8C 260C 549B 97A5 8FB2 EBB4 public key

Good to know

What are you looking for?

Roles in systems engineering and security research, anywhere rigor in low-level code and mathematics both matter.

How should I reach you securely?

Email me and encrypt with the PGP key above; the fingerprint is listed so you can verify it out of band.