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I’m a Frontend Systems Engineer and developer with a product mindset: I build fast, reliable React + TypeScript experiences, designing clean architectures that avoid waterfall data fetching and keep URLs as a single source of truth. I’m especially strong when the math or data correctness matters—on prior work I implemented Uniswap V3 liquidity math directly from first principles, using careful BigInt handling and a fail-fast computation pipeline instead of relying on SDK shortcuts.…I’m a Frontend Systems Engineer and developer with a product mindset: I build fast, reliable React + TypeScript experiences, designing clean architectures that avoid waterfall data fetching and keep URLs as a single source of truth. I’m especially strong when the math or data correctness matters—on prior work I implemented Uniswap V3 liquidity math directly from first principles, using careful BigInt handling and a fail-fast computation pipeline instead of relying on SDK shortcuts.

David Alonso

Software Engineer, Front-End Developer, Product Designer

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I’m a Frontend Systems Engineer and developer with a product mindset: I build fast, reliable React + TypeScript experiences, designing clean architectures that avoid waterfall data fetching and keep URLs as a single source of truth. I’m especially strong when the math or data correctness matters—on prior work I implemented Uniswap V3 liquidity math directly from first principles, using careful BigInt handling and a fail-fast computation pipeline instead of relying on SDK shortcuts.…I’m a Frontend Systems Engineer and developer with a product mindset: I build fast, reliable React + TypeScript experiences, designing clean architectures that avoid waterfall data fetching and keep URLs as a single source of truth. I’m especially strong when the math or data correctness matters—on prior work I implemented Uniswap V3 liquidity math directly from first principles, using careful BigInt handling and a fail-fast computation pipeline instead of relying on SDK shortcuts.

Available to hire

I’m a Frontend Systems Engineer and developer with a product mindset: I build fast, reliable React + TypeScript experiences, designing clean architectures that avoid waterfall data fetching and keep URLs as a single source of truth. I’m especially strong when the math or data correctness matters—on prior work I implemented Uniswap V3 liquidity math directly from first principles, using careful BigInt handling and a fail-fast computation pipeline instead of relying on SDK shortcuts.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Spanish; Castilian

Fluent

Work Experience

Freelance Frontend Systems Engineer

January 1, 2024 - Present

Built a render-as-you-fetch workflow using React Router v8 loaders so data is available on first paint without useEffect waterfalls. Reduced 40 sequential REST calls to a single batched GraphQL query and added viewport-aware caching via IntersectionObserver and session useRef to avoid refetching on scroll-back. Treated filter/sort/pagination state as a shareable, bookmarkable, back-button friendly URL-based single source of truth, omitting default values from output. Ensured consistent manual sorting behavior across the full dataset (not just the visible rows) and implemented efficient differential updates to skip already-cached IDs on repeated triggers.

Protocol Researcher & Quantitative Practitioner at DeFi Protocol Research (freelance)

January 1, 2021 - December 31, 2023

Researched and executed yield strategies across DeFi protocols. Built custom risk-monitoring workflows for volatile markets, translating domain expertise into implementable protocol logic. Worked with protocol-level understanding to make whitepaper math feasible in practice, preceding and informing later DeFi tooling.

Cabin Crew Workforce Intern at Ryanair (Workforce International)

January 1, 2018 - December 31, 2018

Completed international aviation regulatory certification in 30 days with all audits passed on the first attempt, demonstrating structured compliance and fast execution under pressure.

Web Publisher & Programmatic SEO Architect at Independent Consultant

January 1, 2018 - December 31, 2023

Delivered programmatic SEO and automated monetization pipelines to build content properties generating €1,400+ per month. Focused on scalable production workflows and conversion-oriented publishing systems rather than manual, one-off pages.

Bar Manager at Grupo Dani García / Grupo La Máquina / Platea Madrid / Babick Vodka

January 1, 2007 - December 31, 2018

Directed 30+ person teams in Michelin-level environments, owning P&L, inventory, and peak-service execution. Built software to solve operational problems observed on the floor, bringing the same fast-iteration mindset from hospitality into engineering work.