Guillermo Puente Sandoval

Senior Software Engineer · AI Systems · Full-Stack · Web3

Summary

Senior full-stack engineer with 10+ years shipping production systems to user bases in the tens of millions (Evernote, Groupon LATAM). End-to-end ownership from React / TypeScript frontends to Node.js / Go service layers, including AI-powered features (LLMs, RAG, tool-calling agents) and wallet-based identity infrastructure (EVM, DID, signature flows) powering DAO tooling. Shipped Evernote's first AI feature (AI Note Cleanup); core contributor on MakerDAO's Powerhouse platform (~2,100 commits over 2.5 years); led frontend architecture for Plug Wallet, a multi-chain crypto wallet (BTC, ETH, SOL, ICP). Day-to-day, I drive repo-wide refactors with Claude Code + MCP tooling — a workflow I bring to the teams I ship with.

Skills

AI Systems
LLM integrations (OpenAI), RAG, embeddings & vector search (Astra DB), tool-calling agents, prompt design, production cost guardrails, Vercel AI SDK
Agent-driven dev
Claude Code + MCP tooling to automate repo-wide refactors and scaffold features across large monorepos
Web3
Ethereum / EVM, wallet-based identity (DID:pkh, SIWE), transaction signing, JWT-from-wallet auth, Internet Computer, IPFS, Filecoin, smart-contract tooling
Languages
TypeScript, JavaScript, Go, Python, C#, PHP
Backend
Node.js, Express, gRPC, GraphQL, REST, microservices
Frontend
React, React Native, Redux, RxJS, Electron, Vite, Webpack, Storybook, TailwindCSS
Data & Infra
PostgreSQL, MySQL, MongoDB, Redis, vector DBs · Docker, Kubernetes, CI/CD, Fly.io, AWS
Practices
TDD, unit / integration / E2E testing, design review, mentoring

Professional Experience

MakerDAO SES — Senior Software Engineer

Oct 2023 – Present · Remote

  • Core contributor on Powerhouse, a DAO operations platform for governance, document management, and budgeting — ~2,100 commits across a multi-app monorepo.
  • Ship and maintain Renown, Powerhouse's wallet-based identity + credential SDK (DID:pkh parsing, EVM signature verification, JWT bearer sessions) — the auth layer powering every Powerhouse app.
  • Lead the design system used across 3+ production apps (Connect, Academy, Vetra) — React components, Tailwind tokens, Storybook, Vitest coverage.
  • Designed Connect's dynamic plugin system — zero-config install of document models from an HTTP registry, with offline bundle preview and a package-manager UI.
  • Drove platform migrations — Vite 8 + Vitest 4.1 + Tailwind 4.2, Express v5, pnpm workspace consolidation.
  • Built Reactor MCP — an MCP server that lets coding agents (Claude Code, Cursor) scaffold document models end-to-end: state, operations, reducers, editors, drives.

Evernote — Senior Software Engineer

Jun 2021 – Jul 2023 · Remote

  • Shipped Evernote's first AI feature — AI Note Cleanup — to its user base. Owned server-side OpenAI orchestration and in-editor UX. Launched mid-2023 as a 20% public beta before company-wide GA.
  • Owned end-to-end delivery across Node.js / gRPC microservices and the Electron desktop (Win/macOS/Linux), iOS, Android, and Web clients — feature parity across 6 platforms.
  • Delivered and maintained Tasks, a core productivity module used daily by millions across every Evernote client.
  • Mentored 6–8 engineers across 2 internship cohorts (summers 2022 and 2023) — scoping, design review, pair-programming.

Fleek — Frontend Software Engineer

Jan 2019 – Jun 2021 · Remote

  • Led frontend architecture for Plug Wallet, a browser-extension crypto wallet. Originally shipped for the Internet Computer; has since grown into a multi-chain wallet (BTC, ETH, SOL, ICP, Odin) with cross-chain swaps and in-wallet staking.
  • Designed and shipped Space Desktop, a Dropbox-style cross-platform client for IPFS / Filecoin-backed storage — real-time sync, offline support, encrypted per-user containers across Win/macOS/Linux.
  • Built developer tooling (web-based IDE, CI/deploy pipelines) for writing, testing, and deploying smart contracts on Ethereum and the Internet Computer.

ComparaOnline — Frontend Software Engineer

Feb 2018 – Jan 2019 · Santiago, Chile

  • Delivered features for an insurance and financial-product marketplace serving Chile, Colombia, Brazil, and Argentina — React / Redux / RxJS frontend in a micro-frontend architecture, with GraphQL and Node.js microservices.

Groupon — Software Engineer

Jun 2017 – Feb 2018 · Santiago, Chile

  • Founding engineer on the rebuild of Groupon's LATAM e-commerce platform from scratch, serving ~5 core markets (Brazil, Chile, Argentina, Mexico, Colombia) with tens of millions of pre-existing users.
  • Owned multiple Node.js microservices and their consuming React frontends; drove migration of legacy services into the new architecture.

Borealis — Software Engineer

Aug 2016 – May 2017 · Santiago, Chile

  • Delivered services, web and mobile apps for enterprise clients in a software-factory team — Node.js, Laravel (PHP), Angular, Ionic, MySQL, PostgreSQL.

Prior background · 6+ years in finance & accounting before pivoting to engineering — Accounting Analyst at Becton, Dickinson and Co. (2011–2016) and Fixed-Assets Analyst at Capgemini (2009–2011), Santiago, Chile. SAP ERP, treasury operations, and financial close processes. An analytical foundation that still informs how I approach engineering problems today.

Education

Instituto Profesional AIEP — Computer Science

2012 – 2015

Ingeniería de Ejecución en Informática, mención Desarrollo de Sistemas · Best Student — Sede BUS 2016.

Continuing (2021–2026): self-directed study in AI / LLM engineering — tool-calling agents, RAG, Vercel AI SDK, production guardrails. Prior: Electron (FullStack), Go (Udemy), React Native (Udemy).

Guillermo Puente Sandoval

Senior Software Engineer · AI Systems · Full-Stack · Web3

Resumen

Ingeniero full-stack senior con más de 10 años enviando sistemas a bases de usuarios de decenas de millones (Evernote, Groupon LATAM). Ownership end-to-end desde frontends React / TypeScript hasta capas de servicios Node.js / Go, incluyendo features con IA (LLMs, RAG, tool-calling agents) e infraestructura de identidad basada en wallet (EVM, DID, firmas) que sostiene tooling para DAOs. Envié la primera feature con IA de Evernote (AI Note Cleanup); core contributor en la plataforma Powerhouse de MakerDAO (~2.100 commits en 2,5 años); lideré la arquitectura frontend de Plug Wallet, una wallet crypto multi-chain (BTC, ETH, SOL, ICP). A diario uso Claude Code + MCP para refactors a lo largo del repo — un workflow que llevo a los equipos con los que trabajo.

Habilidades

AI Systems
integraciones LLM (OpenAI), RAG, embeddings y búsqueda vectorial (Astra DB), tool-calling agents, diseño de prompts, guardrails de costo en producción, Vercel AI SDK
Agent-driven dev
Claude Code + MCP tooling para automatizar refactors a lo largo del repo y hacer scaffolding de features en monorepos grandes
Web3
Ethereum / EVM, identidad basada en wallet (DID:pkh, SIWE), firma de transacciones, auth JWT desde wallets, Internet Computer, IPFS, Filecoin, tooling de smart contracts
Lenguajes
TypeScript, JavaScript, Go, Python, C#, PHP
Backend
Node.js, Express, gRPC, GraphQL, REST, microservicios
Frontend
React, React Native, Redux, RxJS, Electron, Vite, Webpack, Storybook, TailwindCSS
Datos e infra
PostgreSQL, MySQL, MongoDB, Redis, vector DBs · Docker, Kubernetes, CI/CD, Fly.io, AWS
Prácticas
TDD, testing unitario / de integración / E2E, design review, mentoría

Experiencia Profesional

MakerDAO SES — Senior Software Engineer

Oct 2023 – actual · Remoto

  • Core contributor en Powerhouse, una plataforma de operaciones para DAOs que cubre gobernanza, gestión documental y presupuestos — ~2.100 commits en un monorepo multi-app.
  • Envío y mantengo Renown, el SDK de identidad y credenciales basado en wallet de Powerhouse (parsing DID:pkh, verificación de firmas EVM, sesiones JWT bearer) — la capa de auth que sostiene cada app de Powerhouse.
  • Lidero el design system usado en 3+ apps en producción (Connect, Academy, Vetra) — componentes React, tokens Tailwind, Storybook, cobertura Vitest.
  • Diseñé el sistema de plugins dinámico de Connect — instalación zero-config de document models desde un registry HTTP, con preview de bundles offline y UI de package-manager.
  • Lideré migraciones de plataforma — Vite 8 + Vitest 4.1 + Tailwind 4.2, upgrade a Express v5, consolidación de pnpm workspaces.
  • Construí Reactor MCP — un servidor MCP que permite a los coding agents (Claude Code, Cursor) hacer scaffolding de document models de punta a punta: estado, operaciones, reducers, editors, drives.

Evernote — Senior Software Engineer

Jun 2021 – Jul 2023 · Remoto

  • Envié la primera feature con IA de Evernote — AI Note Cleanup — a su base de usuarios. Dueño de la orquestación server-side con OpenAI y del UX dentro del editor. Lanzada a mitad de 2023 como public beta al 20% antes del GA a toda la compañía.
  • A cargo de la entrega end-to-end en microservicios Node.js / gRPC y en los clientes Electron desktop (Win/macOS/Linux), iOS, Android y Web — paridad de features en 6 plataformas.
  • Envié y mantuve Tasks, un módulo de productividad central usado a diario por millones en cada cliente de Evernote.
  • Mentor de 6–8 ingenieros en 2 cohortes de internship (veranos 2022 y 2023) — scoping, design review, pair-programming.

Fleek — Frontend Software Engineer

Jan 2019 – Jun 2021 · Remoto

  • Lideré la arquitectura frontend de Plug Wallet, una extensión de navegador crypto. Originalmente para Internet Computer; hoy es una wallet multi-chain (BTC, ETH, SOL, ICP, Odin) con cross-chain swaps e in-wallet staking.
  • Diseñé y envié Space Desktop, un cliente cross-platform tipo Dropbox para almacenamiento en IPFS / Filecoin — sync en tiempo real, soporte offline, contenedores cifrados por usuario en Win/macOS/Linux.
  • Construí tooling para desarrolladores (IDE web, pipelines de CI/deploy) para escribir, testear y desplegar smart contracts en Ethereum y en Internet Computer.

ComparaOnline — Frontend Software Engineer

Feb 2018 – Jan 2019 · Santiago, Chile

  • Envié features para un marketplace de seguros y productos financieros en Chile, Colombia, Brasil y Argentina — frontend React / Redux / RxJS en una arquitectura de micro-frontends, con GraphQL y microservicios Node.js.

Groupon — Software Engineer

Jun 2017 – Feb 2018 · Santiago, Chile

  • Ingeniero fundador en el rebuild desde cero de la plataforma de e-commerce de Groupon para LATAM — ~5 mercados principales (Brasil, Chile, Argentina, México, Colombia) con decenas de millones de usuarios preexistentes.
  • A cargo de varios microservicios Node.js y de sus frontends React consumidores; lideré la migración de servicios legacy a la nueva arquitectura.

Borealis — Software Engineer

Aug 2016 – May 2017 · Santiago, Chile

  • Envié servicios, web apps y apps mobile para clientes enterprise en un equipo de software factory — Node.js, Laravel (PHP), Angular, Ionic, MySQL, PostgreSQL.

Trayectoria previa · 6+ años en finanzas y contabilidad antes de pivotar a ingeniería — Analista Contable en Becton, Dickinson and Co. (2011–2016) y Analista de Activos Fijos en Capgemini (2009–2011), Santiago, Chile. SAP ERP, operaciones de tesorería y procesos de cierre financiero. Una base analítica que todavía moldea cómo abordo problemas de ingeniería hoy.

Educación

Instituto Profesional AIEP — Informática

2012 – 2015

Ingeniería de Ejecución en Informática, mención Desarrollo de Sistemas · Mejor Alumno — Sede BUS 2016.

Formación continua (2021–2026): estudio autodirigido en AI / LLM engineering — tool-calling agents, RAG, Vercel AI SDK, guardrails de producción. Antes: Electron (FullStack), Go (Udemy), React Native (Udemy).