Pablo Fernández Ruiz

Software Developer

I'm a software developer focused on developer tools and data systems. I care about performance, design, and building products that feel solid and intentional, from backend to the final user experience.

I'm currently working on several projects, including Horizontables, a desktop tool for modern data engines, and I have a keen interest in web scraping.

You can find my code on GitHub, reach me on @pablofdrz, or write me to email. Always open to conversations about engineering and thoughtful product building.

Selected Projects

Recent Thoughts

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An Approximation That Never Decides

I wrote it down as a choice: the fast distance formula or the exact one. That was wrong. A formula that only shortlists can be as wrong as its speed allows, and choosing between three of them turned out to hinge on a number that runs opposite to throughput.

Vector searchQuantizationNumerical precisionRustBenchmarking
A Bucket That Can Say No

For eighteen years a bucket could not tell two writers apart, so anything keeping its truth in S3 rented a lock from a real database. In August 2024 S3 learned to refuse a write, and a wave of systems moved their commit log into object storage.

Object storageS3DatabasesDistributed systems
Giving an Inbox to Each Agent

Password resets, invoices, and support replies still arrive by email, and my agents live on HTTP. Mailingest is the Rust mail platform I built so that an inbox costs one API call: an address whose mail shows up as a signed webhook.

RustEmailSMTPWebhooksAgents