Looking for a job

Ricardo Castelló

@ricardocastell

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I build Solana DeFi and payments products from on-chain programs to production frontends.

Spain

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What I'm looking for

I’m looking to join a remote-first team where I can own DeFi and payments products end-to-end, from Solana programs and transaction infrastructure to production frontend experiences.

I’ve spent five years building DeFi and payments infrastructure on Solana, owning products end-to-end from on-chain programs to production frontends.

For Jupiter, I helped build Telegram bots from their foundation to 14k users and $3.8M in volume, shipping prediction markets, copy trading, gasless transactions, Privy wallets, and referrals. I’ve also built transaction infrastructure for frnx.ai across swaps, staking, subscriptions, and Blinks.

My work includes Solana Pay monetization and on-chain authentication for Fishnet, Solana indexers for Aleph.im, and reverse-engineering a staking protocol for Botborgs’ NFT airdrop. I also disclosed a critical Phantom Wallet transaction-simulation vulnerability that was rewarded through Bugcrowd.

Today I run Brick Studio, where I build automated web platforms for Spanish local businesses, including scheduling, reminders, SEO, feeds, per-customer databases, and fleet-wide migrations. I’m looking to bring that product ownership to a remote-first team.

Experience

Work history, roles, and key accomplishments

Full-Stack Solana Developer

Jupiter

Jan 2026 - Present (8 months)

Core contributor to the Telegram bots, from their foundation to 14k users and $3.8M volume. Shipped the API surface including prediction markets, copy trading, gasless transactions, Privy wallets, and referrals.

Solana Telegram APIs Prediction Markets Copy Trading Gasless Transactions PrivyWallet Referrals

Full-Stack Solana Developer

frnx.ai

Jan 2025 - Present (1 year 8 months)

Built the Solana transaction layer for swaps, staking, subscriptions, Blinks, and referral demo.

Solana Swaps Staking Subscriptions Blink Referrals

Full-Stack Solana Developer

Fishnet

Jan 2023 - Present (3 years 8 months)

Built monetization components on Solana Pay, with wallet connection and on-chain authentication.

Solana Pay WalletConnect Blockchain Authentication Monetization

Full-Stack Solana Developer

Aleph.im

Jan 2022 - Present (4 years 8 months)

Contributed Solana indexers to Aleph.im's open-source indexer framework.

Solana Indexer Open Source

Full-Stack Solana Developer

Botborgs

Jan 2021 - Present (5 years 8 months)

Reverse-engineered a closed-source staking protocol to power an NFT airdrop.

Solana Reverse Engineering Staking NFT Airdrops

Full-Stack Solana Developer

Delegate Vault

Program and crank liquidating portfolios on stop-loss, take-profit, and time triggers.

Solana Programs Crank Liquidation Stop Loss Take Profit Time Triggers

Education

Degrees, certifications, and relevant coursework

University of Alicante

Double Degree, Computer Science and Business Management

Pursued a double degree in Computer Science and Business Management, including an international exchange at the Technical University of Ingolstadt, Germany.