Engineering principal / internet-scale systems

Francisco Perez Romero

Engineering principal with 18+ years across internet-scale distributed systems, networking, reliability, performance, observability, and production AI infrastructure.

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By: Francisco Perez Romero · 2026-08-07

18+

years in engineering

99.999%

infrastructure reliability context

Millions/sec

CDN request scale

4→15+

engineering team growth

Decision guide

Evidence before prescription.

Systems at uncommon scale

Francisco is currently a Senior Software Engineering Manager at Amazon. His prior work at Meta and Microsoft included infrastructure serving global products, reverse-CDN systems handling millions of requests per second, traffic routing, telemetry, capacity planning, and early Azure networking.

Facebook, Instagram, WhatsApp, and Messenger infrastructure context.
Global routing and telemetry designed for 99.999% reliability.
Microsoft reverse-CDN and early Azure Virtual Network work.
Low-level performance and distributed-systems depth.

AI infrastructure in production

At Félix Pago, Francisco worked on Vertex AI Search, multi-model LLM evaluation using OpenAI, Claude, and Gemini, and performance and observability across critical fintech workflows. His public projects also explore RAG, agent systems, memory, evaluation, and prompt-injection testing.

How this expertise helps clients

Francisco brings distributed-systems, reliability, performance, capacity, observability, AI infrastructure, RAG, LLM evaluation, and technical security depth. That experience helps clients distinguish necessary controls from premature platform complexity.

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Internet-scale infrastructure

Review the attributed operating evidence behind the role.

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AI infrastructure consulting

See the production LLM/RAG engagement.

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