Guillermo Sierra
Senior React Native Engineer
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolGuillermo Sierra is a Senior React Native Engineer with a decade of experience building cross-platform mobile products and multiple startups from Barcelona. He combines a telecommunications engineering background with hands-on expertise in unified React Native Web codebases, real-time sync systems, CI/CD, and ML-enriched content pipelines, having delivered production-ready apps and POS/tablet solutions. As founder/CTO of several ventures and senior mobile lead at companies like Holded and Doctoralia, he bridges product, design, and engineering to ship fast, robust experiences. Notably, he designed route-guard and user store systems to eliminate session bugs and orchestrated GPT-4/third-party enrichment pipelines to automate rich content generation. Willing to relocate globally for cutting-edge projects, he brings an unusual mix of DIY hacker curiosity and disciplined, production-grade engineering.
10 years of coding experience
8 years of employment as a software developer
Exchange Student Computer Systems Networking and Telecommunications, Exchange Student Computer Systems Networking and Telecommunications at EPFLUPC Universitat Politècnica de Catalunya
Catalan, Spanish, English, French
Stackoverflow
21reputation
2kreached
0answers
1question
Github Skills (8)
react-native-component8
nodejs6
fs6
base646
react4
react-native4
mobile2
react-native-contacts1
Programming languages (2)
Github contributions (5)
gsietsetb/guillesierra.com
Nov 2016 - May 2021
Guillermo Sierra web portfolio
Contributions:83 pushes, 2 branches in 4 years 7 months
sierraweb-portfolio
gsietsetb/WookieMovies
Jun 2022 - Jun 2022
Contributions:14 commits, 3 pushes, 1 branch in 3 days
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