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Francisco de Borja Aranda Castillejo

Staff Engineer. 15+ years building systems that run in production.

I take ambiguous problems, figure out the architecture, write the code, ship it, and iterate until it works at scale. I come from the bottom of the stack — Linux kernel, eBPF, networking internals — and work my way up through distributed backends, protocol design, smart contracts, and cloud infrastructure.

What I build

  • Protocol & distributed systems — decentralized messaging networks, cross-chain indexers, consensus-critical backend services
  • Smart contracts & on-chain systems — settlement protocols, registry contracts, Merkle verification
  • Infrastructure — Kubernetes, Terraform, AWS, CI/CD pipelines that don't break at 3am
  • Low-level systems — eBPF networking tools, custom L4 proxies, kernel-level debugging

Stack

Go · Rust · C · Solidity — PostgreSQL, Kubernetes, Terraform, AWS, Foundry

Career

  • Staff Engineer — XMTP Labs · protocol architecture, decentralized backend, smart contracts, cross-chain indexing, infrastructure
  • Protocol Engineer — ZetaChain · Cosmos SDK L1, protocol contracts v2
  • Senior Engineer — Chainlink Labs · infrastructure, smart contract toolchains, cross-chain tooling
  • Principal Engineer — Red Hat · Kubernetes/OpenShift core, eBPF networking, Linux kernel

Links

🌐 fbac.dev · ✍️ blog · 💼 linkedin · 📧 me@fbac.dev

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