Callum B.
Senior Software Engineer @Kulipa
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WORK HISTORY
Senior Software Engineer @Kulipa
Built just-in-time payment flows for Solana-based wallets, processing USDC during card authorization with automated refund mechanisms for failed transactions• Managed fiat settlement pipeline from USDC to Mastercard via Circle and BIN sponsor, handling the complete payment lifecycle from crypto capture to fiat delivery• Built hot wallet operations including balance monitoring for refund liquidity and gas sponsorship for transaction fees• Used idempotency patterns (Redis) and event-driven architecture (Kafka CDC, tRPC microservices) ensuring reliable payment processing• Led KYC provider integration and migration (Onfido → Persona), designing flexible routing for compliance workflows• Provided real-time production support during partner wallet\'s debit card launch at Devcon, debugging payment and KYC issues under pressure• Technical design partner for WaaS provider integration, influencing platform features and API design
EDUCATION
The University of Manchester
Bachelor of Science (BSc), Physics
ABOUT CALLUM B.
Senior engineer building blockchain and fintech infrastructure. At Kulipa, I work across the full stack of crypto-native payments — from real-time card authorization flows with USDC settlement, to wallet integrations, hot wallet operations, and compliance tooling (KYC/AML).Previously led blockchain integrations at Thallo (XRPL token/NFT automation that unlocked a funding round) and BCB Group (ledger reconciliation, cross-chain bridge POCs). I\'ve worked across Solana, XRPL, and EVM chains, with a focus on event-driven architectures and production reliability.I enjoy technically complex problems at the intersection of traditional finance and crypto infrastructure.
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