Sonny Castro
Creating with code. Small details matter.
Overview
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About
Hello, World! I'm Sonny Castro — a full-stack developer passionate about building fast, scalable, and user-focused products that combine clean design with powerful functionality.
With experience across Web2 and Web3, I specialize in high-performance applications using Next.js, React, TypeScript, Solidity, Node.js, and modern cloud tooling. I've built everything from NFT marketplaces and DeFi platforms to AI-driven apps, delivering secure, responsive, and impactful products.
Notable projects include Milady Colombia, an ERC721 collection with 241 ETH in trading volume, and Chonkpool, a DeFi staking dApp on Neon EVM that helped $CHONK reach a $1M market cap. At ArenaX Labs, I deployed 8+ ERC721/ERC1155 smart contracts on Arbitrum, integrated Delegate.xyz for AI Arena, and built miners/validators for Bittensor's Synth subnet. I also delivered full-stack features for SAI, boosting performance and enabling large-scale ML competitions.
Outside of work, I explore new technologies, launch side projects, and create products people actually enjoy using.
Let's connect and collaborate!
Stack
Blog
Experience
ArenaX Labs
- Developed within a pnpm + Turborepo monorepo with Dockerized services.
- Built APIs, endpoints, and UI flows for model submissions, leaderboard tracking, and benchmarking.
- Optimized performance and usability to improve platform responsiveness for large-scale ML competitions.
- Worked on SAI platform for large-scale ML competitions.
- TypeScript
- React
- Next.js
- Node.js
- Docker
- Turborepo
- MongoDB
- Tailwind CSS
- API Development
SteakWallet (acquired by Omni)
Milady Colombia
Chonk Ecosystem
Education
Projects(4)
On-chain arcade experience on HyperEVM using vaults to reward users.
- Designing non-custodial vaults for transparent reward accrual and distribution
- Building lightweight mint/play flows and leaderboards
- Focused on low-friction UX and verifiable onchain rewards
- Live at Hypachinko
- Solidity
- HyperEVM
- Vaults
- React
- Next.js
- Node.js
- Viem
