Gabo EsquivelPDF

Senior Full Stack Engineer

I design and ship end-to-end software across full-stack applications, AI, APIs, and onchain integrations. With 15+ years of experience, I help teams turn ideas into market-ready products for web, mobile, and cloud, working closely with engineering, product, and user experience teams. Fluent in English, Spanish, Portuguese, and Italian.

Highlights

12+ years building 0→1 products for startups and growth-stage teams
Led engineering for Wink, Costa Rica’s first neobank, from architecture to launch
Delivered full-stack systems in fintech, AI, Web3, marketplaces, and consumer products
Deep crypto experience with smart contracts, tokenized systems, and infrastructure

Skills

Languages: TypeScript, JavaScript, Python, Solidity, SQL
Frontend: React, Next.js, Tailwind, Shadcn UI, React Native, Expo, Tanstack
Backend: Node.js, PostgreSQL, Supabase, Prisma, Drizzle, GraphQL
Web3: Foundry, Hardhat, Viem, Wagmi, Ponder, Ethers
AI / ML: LLMs, AI SDK, RAG, Embeddings, Vector Search, Agent Workflows
Cloud & Infra: AWS, GCP, Azure, Docker, Vercel, Pulumi, Terraform, Serverless

Experience

Software Engineer, LegalAgent

Remote • Contract • 2025

AI legal platform: assistant with voice and chat for case context, documents, and procedures.

Delivered multimodal AI assistant (voice and chat) in React Native (Expo).
Implemented RAG architecture for contextual legal support and document summarization.
Built admin dashboard with Microsoft SSO and document management.
Shipped bilingual voice support with realtime transcription and speech synthesis.

Software Engineer, Bitlauncher

Remote • Full-time • Nov 2023 – Nov 2025

AI and crypto launchpad: early access to AI startups via token sales and auctions.

Architected full-stack platform on Next.js 14, Supabase, viem, and wagmi.
Built token bridge flows for USDT, USDC, and BITUSD into protocol tokens.
Integrated Gnosis auction contracts with wallet UX and realtime balance updates.
Developed custom EVM indexer using WebSocket event subscriptions.
Integrated AI SDKs and prompting for masterbots.ai.
Established AI-assisted engineering workflow with Claude, v0.dev, Cursor, and SourceryAI.

Software Engineer, Opyn

Remote • Contract • Oct 2024 – Feb 2025

Decentralized perpetual options protocol on Arbitrum.

Architected Next.js application structure and data-fetching approach.
Built trading interface and custom UI for options trading.
Integrated protocol and Arbitrum testnet with viem and wagmi.
Indexed onchain data with Ponder, PostgreSQL, and Supabase.
Prototyped LLM-based assistant for onboarding and support.

Software Engineer, ZTX

Remote • Full-time • Aug 2022 – Aug 2023

Virtual world with cryptocurrency-backed digital asset ownership.

Implemented WebGL EVM wallet connector with Ethers.js and a custom JavaScript event system.
Configured analytics and reporting with Google Tag Manager.
Owned React architecture on Next.js with Tailwind CSS and Framer Motion.

Software Engineer, RareMint

Remote • Full-time • Jul 2021 – Dec 2022

NFT platform for minting, trading, and collecting digital assets.

Built NFT indexer using Moralis streams, Node.js, and PostgreSQL.
Improved marketplace responsiveness with Remix, Tailwind CSS, and GraphQL.
Integrated WalletConnect for wallet connections and transactions.
Supported launch of first Pokémon card auctions on Polygon.

Lead Engineer, Bitcash

Remote • Part-time • Jan 2020 – Jul 2021

Fiat-to-stablecoin and crypto exchange application.

Architected full-stack platform: React, Vite, Node.js, PostgreSQL, Hasura GraphQL, Google Cloud.
Built peer-to-peer exchange, realtime chat, and backend matching engine.
Developed realtime EOS indexer: Node.js worker threads, binary deserialization, PostgreSQL on Google Cloud.
Implemented WebAuthn-based key management for in-browser transaction signing without external wallet apps.
Delivered QR-based signature requests for partner applications using Supabase subscriptions and webhooks.

Software Engineer, Emanate

Remote • Contract • Dec 2019 – Jul 2020

Social platform for artists.

Maintained and improved streaming web application.
Built back office for artist token payments.
Integrated EOS blockchain with AWS backend services.

Lead Engineer, EOS Costa Rica

Hybrid • Full-time • Mar 2018 – Jan 2020

Block producer: infrastructure and blockchain development services.

Participated in EOS mainnet launch and operated EOSIO-based validators.
Configured private EOSIO chain for Grant Thornton Labs; shipped MVP for intercompany transactions and tax workflows using a stablecoin, hashing, and IPFS for immutable records.
Developed EOS Rate frontend with React and Styled Components.
Led recruiting, onboarding, workshops, and community engagement (e.g., TicoBlockchain.cr, CryptoCantina).

Software Engineer, Knowledge

Remote • Contract • Sep 2017 – May 2018

Tokenized knowledge and expertise platform.

Deployed ERC-20 token for ICO on Ethereum mainnet using Truffle.
Built marketplace and wallet dashboard with React and Web3.js.
Maintained mobile trivia game for token rewards.

Lead Engineer, Wink

On-site • Full-time • Apr 2015 – Mar 2018

Mobile neobank: digital banking and financial services (holawink.com).

Led backend architecture, integrations, and security.
Coordinated partner banks and vendors.
Built biometric KYC with React Native native bridge.
Integrated partner bank APIs.

Lead UI Engineer, AMC Networks

Hybrid • Full-time • Nov 2012 – Apr 2014

Interactive streaming movie service YEAH! (SXSW 2013 launch): classic genre films with interactive bonus content.

Led frontend team with creative and backend partners.
Built interactive video streaming frontend for Facebook application.
Implemented back-office with Brightcove integration.
Shipped interactive trivia, interviews, and quizzes in the video player.
Optimized experiences for curated films with 400+ interactive elements each.

UI Engineer, American Express

On-site • Full-time • Apr 2010 – Nov 2012

Global financial services and card products.

Contributed to migration from Dojo to jQuery.
Implemented responsive layouts, A/B testing, and analytics.
Developed credit card marketing components: comparison sliders and landing pages.