David Ciria Mayordomo

AI Pentester at NeuralTrust, based in Barcelona. I break and help secure AI agents and LLM applications, with a background in ethical hacking, cybersecurity and full-stack engineering.

5 years in cybersecurity · Offensive security & AI/LLM pentesting · MSc Cybersecurity, BSc Computer Engineering

David Ciria Mayordomo
About

I'm an AI Pentester at NeuralTrust, red-teaming the next generation of AI agents and LLM applications. My path into security started with a degree in Computer Engineering and a Master's in Cybersecurity at UPC, where my thesis explored adversary emulation against advanced persistent threats in the financial sector.

Before NeuralTrust I spent almost five years at Ackcent Cybersecurity, first as a developer and later as a pentester, running 50+ web application audits for leading European companies. Outside of work I build small projects and experiment with new technologies.

Experience

AI Pentester

Jun 2026 — Present

NeuralTrust · Full-time · Barcelona (Hybrid)

Offensive security for AI: red teaming and penetration testing of LLM and agentic applications, probing prompt injection, guardrail bypasses and agent tool abuse.

AI Security · LLM Security · Penetration Testing · Python

Pentester

Nov 2024 — Jun 2026

Ackcent Cybersecurity · Full-time · Barcelona

Ethical hacking and penetration testing of web applications, networks and cloud environments, delivering 50+ web application audits for leading European companies.

Penetration Testing · Ethical Hacking · Web & Cloud Security

Developer

Oct 2021 — Dec 2024

Ackcent Cybersecurity · Full-time · Barcelona

Software development, automation and internal tooling on the cloud.

AWS · Docker · GitLab · Python

Full-Stack Web Developer

Oct 2019 — May 2020

Universitat Pompeu Fabra (UPF) · Internship

Developed a full-stack web application, working across the whole stack from responsive interfaces to APIs and data persistence.

Angular · Node.js · MongoDB

Maths Teacher

2017 — 2021

Private Tutoring

Private maths tutoring, explaining complex concepts clearly and helping students build strong problem-solving skills.

Administrative Assistant

Jul 2017

Quadis · Barcelona

Invoice classification and orders management.

Skills
Offensive Security
Penetration Testing, Ethical Hacking, Web Application Security, Network Security
AI Security
LLM Security, AI Agent Security, Prompt Injection, Red Teaming
Development
Python, JavaScript, Java, C++
Web
HTML, CSS, Angular, Vue.js, Node.js, MongoDB
Cloud & Tools
AWS, Docker, GitLab
Languages
English (B2.2), Spanish (native), Catalan (native)
Projects

Cubelles Surf Bot

2022

Telegram bot that predicts the surf waves of Cubelles (Barcelona), running fully serverless on AWS. GitHub

AWS Lambda · Python · EventBridge · CloudWatch

Cave Escape

2021

3D augmented-reality video game where the player is controlled through webcam motion tracking. GitHub

Unity · PoseNet · AR

Fanmatch

2021

3D virtual environment to watch live sports events collectively and in real time. GitHub

HTML · CSS · JavaScript · three.js

Politikeo

2020

Twitter bot that predicts your political identity from your activity on the social network. GitHub

Python · FastText · NLP

Sharlay

2020

A Twitter-style social network built for gamers. GitHub

Java · Apache Tomcat · MySQL

Easy Zone

2018

Parking manager built at the Tecnocampus Mataró hackathon, with real-time maps for blue zones and loading areas. GitHub

Node.js · MongoDB · Socket.IO

Education

Master's Degree in Cybersecurity

2022 — 2024

Universitat Politècnica de Catalunya (UPC) · Digital systems and data protection

Thesis: open-source solutions against advanced persistent threats in the financial sector. GitHub

Bachelor's Degree in Computer Engineering

2017 — 2021

Universitat Pompeu Fabra (UPF)

Technological Baccalaureate

2015 — 2017

Escola Gravi · With honors · Physics, Technology and Technical Drawing

Certifications

Sumo Logic Search Mastery (2021) · Sumo Logic Fundamentals (2021) · SentinelOne Core Workshop (2021) · B2.2 English, UPF (2021) · Mobile App Development, Google Actívate (2020)

Contact

For collaborations, projects or just a quick chat, the fastest way to reach me is by email.

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