Juan Hernández
Back End Developer at Mastodon
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolJuan Hernández is a Senior Software Engineer based in Berlin with 15 years building scalable web backends, currently specializing in Ruby on Rails and working at GitHub. He has a strong track record across product and platform teams at Contentful, Zendesk, XING and others, focusing on performance, architecture and delivery of web applications. Juan combines hands-on backend expertise with systems-level thinking—managing server, deployment and scalability concerns since early roles handling Linux web infrastructure. He is also an active open-source contributor to notable projects like Rust’s cargo, where he fixed parsing, update and test-related bugs, showing fluency beyond the Ruby ecosystem. Comfortable in multilingual teams and Spanish-speaking environments, he blends practical engineering with project leadership experience from early project lead roles. Colleagues rely on him to turn complex requirements into reliable, maintainable backend systems.
16 years of coding experience
19 years of employment as a software developer
Ingeniero Técnico en Informática de Sistemas Programación, Ingeniero Técnico en Informática de Sistemas Programación at Universidad de ValladolidBachelor's Degree Computer Science and Information Technology, Bachelor's Degree Computer Science and Information Technology at the Technical College of Computer Science at the University of Valladolid
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (8)
package-manager10
cargo10
rust10
testing10
error-handling9
configuration-management9
sem8
build-automation8
Programming languages (5)
Github contributions (5)
rust-lang/cargo
Sep 2016 - Nov 2016
The Rust package manager
Role in this project:
Backend Developer
Backend DeveloperContributions:12 commits, 5 PRs, 30 comments in 1 month
Contributions summary:Juan primarily contributed to bug fixes and improvements within the `cargo` package manager, focusing on configuration parsing and test suite enhancements. They addressed an issue of parsing home configurations multiple times. The user also fixed an issue related to the `cargo update` command in empty workspaces. Furthermore, they added error messages for invalid semver specs in the `[replace]` section and implemented correct `cfg` flags for rustdoc tests.
package-managerrustcargo
jhbabon/dotfiles
Aug 2010 - Feb 2023
Contributions:877 commits, 364 pushes, 34 branches in 12 years 8 months
unixconfiguration-filesconfigurationconfig
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