Open to work · Alicante, remote
I build trading & payments infrastructure on Solana.
Ricardo Castelló, senior full-stack engineer. Since 2021 I've shipped production systems for Jupiter, frnx.ai and Fishnet, owning delivery end to end, from on-chain programs to backend APIs and the frontends people use. Now also running Brick Studio, a web agency for small businesses.
Experience
- 2026JupiterFull-stack
Co-built the Telegram trading and prediction bots from launch to 14,000 users. Webhook backend for copy trading, gasless transactions, Privy wallets and Mini Apps.
- 2025frnx.aiFull-stack
Solana transaction layer for swaps, staking, subscriptions and blinks. Delegate Vault: a program that liquidates portfolios on stop-loss, take-profit or time triggers.
- 2023FishnetFull-stack
Solana Pay payment and monetization components with wallet auth.
- 2022Aleph.imBackend
Open-source Solana indexers turning on-chain transactions into queryable data for DeFi protocols.
Blocks of code
Recurring USDC Subscriptions on Solana
Complete implementation of recurring, on-chain USDC billing using the Solana Subscriptions program (@solana/subscriptions) built on @solana/kit
solanasubscriptionspaymentsSquads Multisig CLI with Solana Kit
Complete implementation of a multisig management system using Squads v4 and Solana Kit, featuring treasury management, proposal creation, voting, and execution with modern Solana development tools
solanamultisigsquadsSolana-Supabase Authentication
Complete implementation of Solana wallet authentication using Supabase as the backend, with Next.js 14 and shadcn/ui components
solanasupabaseauthenticationSolana Payments with Jupiter
Complete implementation of a payment system using Jupiter for token swaps and Solana for transactions, allowing users to pay with any token while receiving USDC
solanajupiterweb3Solana Token Monitoring
Complete implementation of a token indexing and monitoring system for Solana blockchain with real-time transaction processing and Firebase integration
solanablockchainmonitoring