Jonathan Barquero
Freelance Full Stack Software Developer at US Software Development Agency
Costa Rica
Summary
👤
Senior🎓
Top SchoolJonathan Barquero is a freelance full-stack software developer with over a decade of professional experience and a 19+-year engineering background focused on Ruby on Rails, Node, React and Flutter. He builds scalable web and mobile applications and IoT solutions, with deep expertise in high-traffic systems, asynchronous processing, and performance optimization. Comfortable across the stack, he pairs cloud and DevOps practices (AWS, Docker, Kubernetes) with proven testing and TDD workflows to deliver reliable production systems. Recently he’s applied LLMs and AI agents (Llama, Mistral, GPT) and fine-tuning techniques (SFT, RAG) to productize intelligent features. Based in Costa Rica, he blends long-term consulting at agencies and freelance architecture roles with hands-on implementation, making him effective both as a solo contributor and team lead. An interdisciplinary background that includes human studies informs his pragmatic focus on usable, well-architected software.
12 years of coding experience
15 years of employment as a software developer
Engineer's Degree Computer Science, Engineer's Degree Computer Science at Universidad Latina de Costa RicaBachelor's Degree Computer Science with Software Development Emphasis, Bachelor's Degree Computer Science with Software Development Emphasis at ULACITHuman Studies : History Literature Philosophy Ethics Visual Arts Musicology, Human Studies : History Literature Philosophy Ethics Visual Arts Musicology at Universidad Estatal a Distancia de Costa Rica
English, Portuguese, Spanish
Stackoverflow
7,787reputation
8.9mreached
136answers
2questions
urllib
top-5%
ruby
top-5%
ruby-on-rails
top-5%
excel
top-5%
youtube
top-1%
youtube-api
top-1%
Github Skills (35)
youtube-api10
rubygems10
rails10
interop10
youtube10
ruby10
html10
ruby-wrapper9
exceptions9
django9
mvc9
excel9
ruby-on-rails9
activerecord9
urllib9
Programming languages (4)
Github contributions (5)
jonbarlo/pos-engine
Jul 2025 - Aug 2025
Contributions:36 pushes, 1 branch in 1 month
jonbarlo/white-label-pos-mobile
Jul 2025 - Aug 2025
Contributions:31 pushes, 1 branch in 26 days
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