Open to opportunities

João André Gomes Marques

@jooandrgomesmarques

Message

I secure DeFi protocols and build post-quantum cryptography and AI-agent governance systems.

Portugal

Message

What I'm looking for

I'm open to remote roles in Europe where I can secure DeFi and AI systems, build post-quantum cryptography, and deliver practical security tooling.

At Flow Traders, I review DeFi protocols and smart contracts before trading capital is exposed, while handling security incidents and hardening smart-contract and node deployments.

I founded Asqav, an AI-agent governance platform with a public SDK, self-hosted core, post-quantum tamper-evident audit trails, and 250+ GitHub stars. I also built Asondy, a deterministic verification harness that makes AI coding agents reproduce evidence before acceptance criteria can pass.

Previously, I integrated ML-KEM and ML-DSA into pi-lar’s production C networking framework and built blockchain-backed cryptographic APIs at the University of Coimbra. I also wrote tamper-evident logging guidance for the OWASP AI Exchange.

Experience

Work history, roles, and key accomplishments

Current

Security Engineer

Current

Flow Traders

Feb 2026 - Present (6 months)

Conducts security evaluations of DEX and DeFi protocols, handles incident response, and integrates monitoring and auditing tooling. Works with trading and engineering teams to harden deployments and set security policy for internal AI tooling.

Threat Detection Incident Response SOAR Smart Contract Auditing DeFi Security Application Security Python