Alex Fernández
Madrid, Community of Madrid, Spain
Summary
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RockstarAlex Fernández is a Madrid-based Head of Engineering and backend developer with 20+ years' experience who balances hands-on coding with strategic leadership after stints as CTO and founder. Fluent in Python by vocation and JavaScript by choice, he has modernized architectures and shipped high-throughput systems—including work on Devo's ingestion pipeline handling 3.5M events/sec and a migration that cut an invoicing job from one week to four hours. As a technical leader across startups and enterprises (Inditex, TUI, ING), he specializes in performance, scalable backends and pragmatic product-driven engineering. He contributes to open-source tooling such as the loadtest project—owning ES6 migration, latency/hrtimer refactors and the core load engine—and frequently blends backend depth with operational reliability. He holds a Bachelor's in Physics, bringing a physicist's analytical mindset to ship measurable improvements at scale.
17 years of coding experience
Stackoverflow
1,958reputation
303kreached
35answers
12questions
Github Skills (20)
javascript10
performance-monitor10
node-js10
mstest10
performanceanalysis10
teste10
javascripts10
uitesting10
performancemonitor10
testing9
refactorings9
refactoring9
amazon-ses6
nodejs6
android6
Programming languages (12)
Github contributions (5)
alexfernandez/loadtest
Jun 2013 - Nov 2020
Runs a load test on the selected URL. Fast and easy to use. Can be integrated in your own workflow using the API.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:11 reviews, 66 commits, 73 PRs in 7 years 6 months
Contributions summary:Alex primarily focused on improving the load test functionality and its codebase. Key contributions include migrating the project to ES6, refactoring the timing and latency measurement, incorporating error code handling, and fixing keep-alive connections. They addressed a reported bug related to URL replacement and implemented the core logic for the load test engine. The user also refactored parts of the code and separated timing logic into latency and hrtimer modules.
testingload-testrunsloadtestingnodejs
alexfernandez/alexfernandez.github.io
Oct 2015 - Mar 2025
Contributions:2601 pushes in 9 years 6 months
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