Gabo EsquivelPDF
Senior Full Stack Engineer
Building AI-powered products and crypto-native applications. I design and ship systems end-to-end, working with modern stacks, LLMs, APIs, and onchain integrations.
With 15+ years of experience, I help teams turn ideas into market-ready products across web, mobile, and cloud, collaborating across engineering, product, and user experience. Fluent in English, Spanish, Portuguese, and Italian.
Highlights
- 9+ years in crypto (DeFi, NFTs, EVM, onchain infrastructure)
- 12+ years building 0→1 products across startups
- Led engineering for Costa Rica’s first neobank (Wink), from architecture to production
- Shipped AI, Web3, fintech, and consumer products used in production environments
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: Solidity, 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
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
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
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
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
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
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
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
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
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
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
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
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.
Let's Work Together
I work through long-term or short-term remote 1099 contracts via my US-based company, Blockmatic Labs LLC . This setup gives clients straightforward contracts, built-in compliance, and IP protection. Based in Costa Rica, I operate on US Mountain Time and am available for travel when needed.
If you’re building something ambitious—whether a decentralized system, an AI-powered product, or a new idea that needs a strong technical foundation—I’d be glad to connect.
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