Sacha Graff
DeFi Risk Curator & Vault Engineer
I've always been obsessed with vaults: the one DeFi primitive where architecture, trust, and risk all have to work together perfectly. I build them end-to-end, and curate the risk that decides what's safe to hold inside:
Risk isn't a constraint on craft. It is the craft.
I ship production infrastructure, not proofs of concept.
Cross-chain yield aggregator, underwritten like structured credit. I own it end to end: risk, protocol, infra, product, growth. Built to run without single-person dependencies: runbooks for every failure mode, automated guardrails, and three independent security reviews coordinated to completion.
Most DeFi allocators pick strategies by APY and gut feel. Hallmark is my answer to that: a quantitative underwriting discipline, borrowed from structured credit, scoring every layer 1–10 before capital moves.
Protocol and Asset Risk are themselves weighted composites of 6 and 5 criteria, spanning smart-contract, liquidity, counterparty, oracle, and market risk. Hard caps on any single criterion can exclude a strategy outright, and a watchlist band imposes manual review with capped position sizing. Scores are re-evaluated quarterly and on material events; any change cascades to every dependent strategy.
Methodology and scores are public and reproducible. Deep-dive rationale stays private, NDA-gated for institutional LPs.
ForgeYields needed a Starknet-native, ERC-4626-compliant vault primitive. Instead of keeping it closed, I open-sourced it in partnership with Starknet.
No yield product had cracked cross-chain UX yet. I saw the opening to be first.
Protocol governance lived entirely on Ethereum. Extending it to Starknet meant porting years of battle-tested security assumptions, not just relaying a message.
Yearn's vault weights were set manually, then rubber-stamped by a multisig. What if the best allocation could be proven correct with math, instead of trusted on faith?
Starknet DeFi had no unified way to see your positions. No wallet connect, just an address and a dashboard. I built it.
Starknet DeFi was young and fragmented. Positions scattered across pools, no unified view. I built the tracker I wished existed.
Non-custodial vaults still relied on multisigs and centralized front-ends. I wanted curators to act on verifiable, on-chain logic directly.
Preceded by two years of classes préparatoires (MPSI/PSI, 2017–2019), France's selective, intensive math and physics track. Mines Saint-Étienne ranks among France's top 10 engineering schools; the French Diplôme d'Ingénieur is legally equivalent to a Master's degree.