Fernando Calleja
Lead Site Reliability Engineer at 37signals
Valencian Community, Spain
Summary
🤩
Rockstar🎓
Top SchoolFernando Calleja is a Lead Site Reliability Engineer with 14 years of hands-on experience building and operating resilient infrastructure for product-focused companies like 37signals, Basecamp and HEY. He progressed from DevOps and SRE roles to lead infrastructure teams, combining pragmatic ops instincts with long-term reliability and scalability work. Based in the Valencian Community, he pairs a formal Computer Science background with a master's in Cities and Urbanism, reflecting curiosity beyond tech and an eye for systems-thinking at different scales. An active open-source maintainer at OscillatingWorks, he favors simple, maintainable tooling over flash — and, despite LinkedIn endorsements, he’s clear he’s not a Java developer. Colleagues describe him as someone who reliably turns operational chaos into predictable systems while keeping product needs central.
14 years of coding experience
8 years of employment as a software developer
Beca Erasmus Informatik, Beca Erasmus Informatik at The Philipp University of MarburgComputer Science Engineering Information Technology, Computer Science Engineering Information Technology at Universidad Complutense de MadridUOC (Universitat Oberta de Catalunya)
English, German, Spanish
Github Skills (136)
database-engine10
http10
gorilla10
webserver10
fault-tolerance10
rest-api10
cloud-control10
stack10
linux10
rest10
sql10
golang10
database10
sqlite10
data-structure10
Programming languages (10)
Github contributions (5)
oscillatingworks/discosenvela.es
Mar 2023 - May 2026
Contributions:87 pushes, 2 branches in 3 years 2 months
fern4lvarez/fern4lvarez.github.io
Mar 2015 - Dec 2020
Contributions:11 pushes in 5 years 10 months
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