Fintech · RWA · Asset Managers

DEFENSAHACKER

Boutique cybersecurity for fintechs, tokenization companies, real-world-asset platforms, and asset managers. Penetration testing, smart contract audits, and custody reviews.

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defensahacker ~ recon

$ whoami

CEH · OSCP · CSCA · 20+ years

$ scope --target fintech,rwa,tokenization

Penetration testing · Smart contract audits · Custody reviews

$ status

Ready for engagement

Defensahacker Labs is a boutique cybersecurity consulting firm offering expert penetration testing, smart contract audits, and AI red teaming. Founded by a Certified Ethical Hacker (CEH) and Offensive Security Certified Professional (OSCP) with over two decades of hands-on experience — we help banks, fintechs, DeFi protocols, and enterprises identify and remediate critical vulnerabilities before attackers do.

20+
Years Experience
CEH
Certified Ethical Hacker
OSCP
Offensive Security
CSCA
Smart Contract Auditor
Services

What we do

01
⚔

Penetration Testing

We simulate real-world cyberattacks on your systems, networks, and applications to uncover vulnerabilities before malicious actors do — delivering a clear picture of your true risk exposure.

Web AppNetworkAPICloud
02
⛓

Smart Contract Audit

Blockchain and DeFi protocols introduce unique security challenges that traditional testing misses. A single vulnerability in a smart contract can result in irreversible financial loss. We go beyond the contract — auditing your entire ecosystem end-to-end.

SolidityDeFiRWATokenization
03
🤖

GenAI Red Teaming

LLM-powered applications introduce attack surfaces traditional tools do not cover. We test against prompt injection, jailbreaking, data exfiltration, and agentic privilege escalation.

Prompt InjectionAgent SecurityData Leak
About

Built on real experience

Having worked as a consultant and penetration tester for top-tier banks, the European Central Bank, pharmaceutical and automotive companies across several regions and continents — we have vast experience with all types of companies and engagements.

Every engagement is led by a senior security engineer who thinks, moves, and pivots like an actual threat actor — uncovering logic flaws and chained vulnerabilities that tools miss.

CEH
Certified Ethical Hacker
OSCP
Offensive Security Certified Professional
CBSP
Certified Blockchain Security Professional
CSCA
Certified Smart Contract Auditor
Why Us

Why organizations choose Defensahacker

Real-world attacker mindset

We don't run automated scanners and call it a pentest. Every engagement is led by a senior security engineer.

End-to-end coverage

From Web2 frontends and APIs to smart contracts and custody systems — we cover the full attack surface.

Actionable findings

Clear reports with proof of concept, business impact, and remediation guidance that survives audit.

Team

The people

JA
Jacobo Avariento
Founder & Security Engineer

CEH, OSCP, CSCA. 20+ years in cybersecurity, focused on security for fintech platforms, tokenized assets, and asset managers.

FAQ

Common questions

What is penetration testing and why does my company need it?
A penetration test is a controlled simulation of a cyberattack against your systems, applications, or network. Fintechs and asset managers use it to satisfy PCI-DSS, ISO 27001, and SOC 2, and to find paths into client assets, issuance admin, and custody operations.
How is a smart contract audit different from a traditional security audit?
Token contracts are immutable once deployed, so a flaw in issuance, redemption, or share accounting is a balance-sheet problem. A smart contract audit combines manual review with fuzzing and invariant testing, and covers the off-chain systems — frontends, APIs, allowlists, and admin keys — where tokenized-asset losses usually start.
What is GenAI Red Teaming and does my AI product need it?
GenAI red teaming tests LLM-powered applications against prompt injection, jailbreaking, data exfiltration, and agentic privilege escalation. Fintech and asset platforms that use a model for support, onboarding, research, or operations have an attack surface traditional tools do not cover.
Contact

Start a conversation

Ready to identify and remediate critical vulnerabilities before attackers do?