dalonso

Built two production-grade frontend applications from scratch, targeting real-world problems in DeFi and hospitality UX. DeFiScout — LP position simulator for Uniswap V3 liquidity providers - Implemented concentrated liquidity formulas directly from the Uniswap V3 whitepaper: `L = min(Lx, Ly)` in √price space, tick-to-price conversion `P(i) = 1.0001ⁱ`, BigInt precision for on-chain liquidity values (~10²⁴) - Designed an 8-stage fail-fast computation pipeline where each stage returns a typed discriminated union — errors surface at origin, never silently downstream - Built a 4-tier data quality engine (INSUFFICIENT → EXCELLENT) that degrades projections gracefully rather than returning invalid results - Replaced 40 sequential REST calls with batched GraphQL queries; added IntersectionObserver lazy loading and session-scoped `useRef` cache - Full-dataset in-memory sort across 1,000 pools via TanStack Table v8; URL-as-state for all active filters - Pure function test suite (Vitest) with zero React dependencies — business logic tested in isolation SipMatch — Cocktail recommendation engine - Encoded 11 years of hospitality management expertise into a 3-question recommendation engine returning 1–5 curated results — designed around the moment customers freeze in front of a 30-item menu - Modeled cocktail types as discriminated unions (`AlcoholicCocktail | NonAlcoholicCocktail` with `hasAlcohol` literal) for full type narrowing - Built a locale-agnostic recommendation engine (`useAnswerMapping`) that decouples i18n from business logic — translations are a presentation concern, not a data concern - Derived Q3 options dynamically from Q1+Q2 filter state; implemented skip logic with `useRef` guard to prevent double-render transitions - Refactored ~200-line monolithic component into 6 single-responsibility hooks - CSS Scroll Snap carousel with zero JS scroll logic; WCAG 2.1 AA compliance; bilingual ES/EN via react-i18next + ICU

Actively deployed and managed capital across the DeFi ecosystem — liquidity provision, yield optimization, cross-protocol strategies — while developing a rigorous understanding of the underlying mechanics. - Operated across Ethereum mainnet and L2 chains (Arbitrum, Optimism, Polygon), managing gas cost strategy and cross-chain bridging as part of active position management - Studied AMM design in depth: Uniswap V2/V3 concentrated liquidity, impermanent loss dynamics, tick-based range selection — this research directly preceded and informed the architecture of DeFiScout - Analyzed tokenomics models and protocol incentive structures to evaluate yield sustainability vs. inflationary emission risk - Managed both hot and cold wallet infrastructure (MetaMask, Ledger) with full self-custody discipline throughout This wasn't passive observation. It was capital at risk, decisions under uncertainty, and systematic analysis of protocol behavior — the same analytical framework I now apply to software architecture.