jcsec.io

Contact

ES

In an increasingly decentralized world, let's be people working together

Here, you will find a senior security professional who helps early-stage Web3 teams reduce risk across:

  • Protocol design hardening
  • Smart contracts
  • Operational security
  • Audit readiness

I work best with teams that are not ready to hire a full-time security lead, but need more continuous support than a one-off audit can provide.

Developing Web3 systems is hard enough

Equipo

You already need to make difficult product, engineering, and go-to-market decisions. The last thing you want is to have also to be a security expert.

Don't be

DELEGATE

Lean on a experienced security professional to make your product robust and reliable.

I help you decide what to review, what to harden, what to automate, and what to prepare before launch, audit, fundraise, or major protocol upgrades.

But wait, I haven't introduced myself yet...

I'm JC and this is what I can offer you:
Seguridad en el ciclo de desarrollo

Background & career

Security engineer and auditor with 10+ years of experience across offensive security, smart-contract security, and blockchain protocol review.

Experienced across Solidity/EVM, DeFi systems, account abstraction, and Rust-based smart-contract ecosystems.

Audit team

Advisory & support

I help early-stage Web3 teams reduce security risk before launch, audit, fundraise, or major protocol upgrades.

My work covers protocol review, audit readiness, operational security, developer workflows, and security strategy.

Formación

And with the soul of a teacher

I don’t just audit; I help teams build security judgment.

I teach smart-contract security at university level and design practical workshops, CTFs, and training environments.

If this sounds good, and you want someone to get involved in your project instead of just sending a report, we may be a match.

Want to give it a try?

Let's talk

It's been a long (and fun) road so far…

I have provided Offensive Security consultancy services to high-profile international clients in the banking, healthcare or energy sectors.

My specialty is getting into the attacker’s mindset to help Web3 teams identify and reduce security risk across code, architecture, and operational processes.

I combine a traditional offensive security background with hands-on smart-contract and protocol security experience. My work spans Solidity/EVM, DeFi systems, account abstraction, Rust-based smart-contract ecosystems, and audit readiness.

Today, I focus on helping early-stage protocols build a stronger security posture before launch, external audits, fundraises, or major upgrades.

In addition to security reviews and advisory work, I teach Solidity and Ethereum security at university level and deliver practical workshops for developers and auditors.

I also design hands-on security training environments, CTF challenges, and vulnerable-by-design projects such as Faillapop, helping teams and learners develop practical security judgment.

Yeap, I've been busy. But hey, I'm not always working!

Although technology is my passion, I love having time away from the keyboard to learn aerial acrobatics, do some rock climbing and enjoy local concerts.

And of course, there will never be a single trip where I don’t look for local food or nice restaurants to eat at beforehand.

If you are building an early-stage Web3 protocol and need senior security guidance, let’s talk.

I can help you reduce risk across protocol design, smart contracts, operational security, infrastructure assumptions, and audit readiness.

Send me an email