Hi there, I'm Oscar Fonseca 👋

Full-Stack Developer building scalable & capital-efficient solutions on the blockchain.

I'm a seasoned developer who has transitioned from traditional software engineering to building the future of the decentralized web. My passion lies in creating robust, scalable solutions that solve real-world problems. I thrive in high-pressure environments like hackathons, which have accelerated my learning from Solidity to the Move language.

My current focus is on Financial Engineering in DeFi—exploring how to create complex, innovative financial products on-chain by leveraging proven financial technology principles. I'm not just a developer; I'm a builder focused on shipping products that have a meaningful impact.

I believe in learning by building, and I'm proud of the solutions I've architected under pressure.

• 🚀 Aptos Ctrl+Move Hackathon 2025 (Submission)

  • Project: Verifi Protocol - An on-chain prediction market with its own oracles and composing AMM with Tapp Exchange and using Nodit services for live data.
  • Tech Stack: Move, Aptos SDK, TypeScript, Next.js, Tailwind, Shadcn, Zustand, Biome, Go, Prisma, Supabase, PostgreSQL, ChatGPT API, Nodit API
  • Achievement: Built a full-featured dApp and learned a new smart contract language in a short timeframe.
  • 

• 🥇 Infinita DeSci Web3 Hackathon (Winner)

  • Project: Veritas Protocol - An On-Chain Protocol for Verifiable Clinical Audit Trails.
  • Tech Stack: Solidity, Next.js, typescript, hardhat, Prisma, Supabase, PostgreSQL,
  • Achievement: First place winner, recognized for innovation in the Decentralized Science space.
  • 

• 🥇 Base miniApps Hackathon by Campus On Chain & a0x (Winner)

  • Project: SocialDrop - The Airdrop Platform that Creates Communities, not Mercenaries.
  • Tech Stack: Solidity, Base, Base Onchain Kit, Base Account, Farcaster API, Neynar, AWS, a0x JesseBot
  • Achievement: First place winner, creating a practical mini-app on the Base L2 network.
  • 

This is a snapshot of the tools and technologies I use. I'm always learning and adapting.

const oscarFonseca = {
  pronouns: "He" | "Him",
  askMeAbout: ["web3", "DeFi", "scalability", "solution-architecture", "photography"],
  technologies: {
    blockchain: ["Solidity", "Move", "Hardhat", "Foundry", "OpenZeppelin", "Aptos SDK"],
    frontEnd: {
      core: ["React", "Next.js", "TypeScript"],
      styling: ["TailwindCSS", "SASS", "Chakra UI"]
    },
    backEnd: ["Node.js", "Express", "NestJS", "Go"],
    devOps: ["AWS", "GCP", "Docker", "Kubernetes", "GitHub Actions"],
    databases: ["Postgres", "MySQL", "MongoDB", "Redis"],
    learning: ["Rust", "Solana Development", "Zero Knowledge (ZK)", "LLMs & ML", "n8n"]
  },
  community: {
    coorganizer: "Ethereum Honduras","Ethereum San Pedro Sula",
    mentor: "ETH KIPU",
  }
};

I'm always open to discussing new projects, creative ideas, or opportunities to be part of an ambitious team. Pick a slot if you'd like to chat!