Marc — Security Researcher

Security engineer and researcher working at the intersection of exchange security, Web3 protocol security, and security operations. Currently on the security team at Polymarket, defending a hybrid on-chain/off-chain prediction market — and the US-regulated exchange alongside it — where markets settle real-world outcomes with real money at stake.

Exchange & Protocol Security

I design and operate multi-layer security architectures for environments where a single exploited vulnerability can result in nine-figure losses: HSM-backed signing infrastructure, onchain invariant and settlement monitoring, frontend and supply-chain integrity, and smart contract auditing.

Security Operations & Automation

I run detection and response on Cortex XSIAM and Cortex XDR — case triage, causality-chain analysis, XQL threat hunting, and response playbooks mapped to MITRE ATT&CK. I also build the automation layer above it: AI-assisted triage that digests a case into a prioritised brief, with a human on every action that changes state.

Adversarial Research

I research real-world threat actors targeting the crypto space — including nation-state groups like BlueNoroff (Lazarus Group / DPRK) that actively target protocols and their operators for financial theft. My work focuses on behavioural analysis and translating findings into high-fidelity detection engineering rather than indicator-based defences that age quickly.

Detection Engineering

I turn threat research into durable detection logic, correlating onchain signals with infrastructure telemetry to distinguish genuine exploit activity from noise.

---

Work with me

Available for security consulting through Senshi Cyber Consulting SLU — protocol and smart contract security reviews, detection engineering and SOC build-out, and adversarial assessment of Web3 infrastructure.

Contact: marc@senshi.cc · LinkedIn