Web3 / NFT

Cosmodinos

  • 2022
  • Tech Lead (Contract)
  • Solo
  • Shipped

The context

Cosmodinos is a Web3 brand built around cartoon dinosaurs from the cosmos — three NFT collections on Ethereum (Gods 88, Alpha 888, Omega 8,888, designed by MBE & Valentin), a community big enough to host IRL events, and merch on top.

I joined as the sole technical builder to ship every piece of the platform the community traded on.

My role

Solo tech lead. Wrote every line of Solidity myself, built the dApp and the backend that powered the marketplace, and shipped on the timelines the mints needed.

What I built

  • Multi-collection NFT marketplace

    The reason this existed was to bypass OpenSea — both for fees and for control. The marketplace handled multiple Cosmodinos collections under one roof, and supported event-driven drops and auctions tied to community moments rather than a generic listing flow.

  • All Solidity smart contracts, from scratch

    ERC-721 collections, marketplace contract with escrow, royalties, and the auction logic. No external audit budget — I wrote, reviewed, tested, and shipped it myself. The contracts held in production through the whole trading life of the platform.

  • React + ethers.js dApp

    Full marketplace UI with WalletConnect for multi-wallet support, on-chain reads and writes via ethers.js, and the kind of latency people expect from a Web2 product, not a Web3 one.

  • Node.js + GraphQL backend with a custom indexer

    Listening to on-chain events and indexing them into a queryable layer, so the dApp could render listings, holdings, and history without burning an RPC call per render.

Tech stack

  • Solidity

    All smart contracts — collections, marketplace, escrow, royalties.

  • Ethereum

    Mainnet target.

  • React

    dApp frontend.

  • Node.js

    Backend services + on-chain indexer.

  • GraphQL

    API serving the dApp from indexed chain data.

  • TypeScript

    End-to-end on the off-chain side.

  • ethers.js / Web3.js

    Wallet connection and on-chain calls.

Impact

  • users

    10K+

  • trading volume

    3,000 ETH

  • NFTs across 3 collections

    9,864

The trade-off

Solo, no audit budget, hard mint deadlines. I wrote every line of Solidity myself, with the paranoia that approach deserves — heavy testing, careful reviews, no clever code where boring code would do. The contracts shipped and held. The Web3 market has cooled since 2022 — the entrepreneurial experience and the engineering work are what stays.

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