Albert Bausili Fernández
Software & systems engineer in Barcelona. I care about performance, privacy, and understanding systems all the way down.
Hi
I'm Albert — a software and systems engineer who likes working close to the metal and close to the problem. I earned both my Bachelor's and Master's in Informatics Engineering at the Universitat Politècnica de Catalunya (UPC). My Master's thesis was Celeris — a high-performance Go HTTP engine built directly on low-level Linux kernel primitives (io_uring and epoll). It's the project I'm proudest of: on a self-built bare-metal benchmark cluster spanning x86-64 and Arm, it reaches the highest HTTP/1.1 and h2c throughput I'm aware of — ahead of the fastest servers in C, C++, and Rust (H2O, Lithium, and the rest).
Most of what I build ends up written about here — the reasoning, the dead ends, and the parts that actually worked. I work mainly in Go and other systems languages, with regular detours into databases, algorithms, and the occasional bout of LLM tinkering.
What I do
- High-performance systems — HTTP engines, event loops, and kernel-level I/O (
io_uring,epoll), zero-allocation hot paths, and the benchmarking rigor to prove it. - Systems & web platform — servers, edge-deployed services, and performance-first web engineering (this blog included).
- Privacy-first tooling — software that runs locally and keeps your data on your machine.
- AI tinkering — LLM tooling and security experiments, whenever something piques my interest.
Projects
- Celeris — a high-throughput, load-bearing Go HTTP engine on a dual
io_uring/epollarchitecture, with first-party event-loop database drivers. My Master's thesis, and the best thing I've built. - LibreUtils — a privacy-first collection of web tools (compression, encryption, image editing, and more) that run entirely in your browser. No uploads, no ads.
- TTRPG Session Manager — a web app for running tabletop RPG campaigns as a GM: plans, images, audio, NPCs, monsters, and more.
- This blog — a zero-cost, framework-free static site on Cloudflare Workers. Source is public.
Get in touch
Find me on GitHub, LinkedIn, and X. Or subscribe to the RSS feed.