Celso Dantas
Staff Engineer at Shopify
Ottawa, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolCelso Dantas is a Staff Engineer with 14 years of professional experience designing and shipping high-throughput Ruby/Rails systems and back-end services, currently driving Storefront Renderer and GraphQL performance efforts at Shopify. He combines deep UNIX and multi-language expertise (JRuby/Ruby, C/C++, Go, JavaScript, SQL) with hands-on experience operating massive databases and services serving hundreds of thousands to millions of requests per minute. Known for pragmatic debugging, TDD-driven development, and leading cross-functional teams, he has led major projects like multi-location inventory and high-scale Frenzy backends. An active open-source contributor, he improved payment gateway robustness and helped localize the Rubinius documentation into pt-BR, showing attention to both reliability and global developer experience. Comfortable working under pressure, he pairs a curiosity for algorithms and design patterns with practical operational know-how from large migrations and MySQL tuning. Based in Ottawa, he brings a blend of systems-level thinking and production-grade engineering to complex distributed web platforms.
15 years of coding experience
11 years of employment as a software developer
English Course, English Course at Pacific Gateway International CollegeBach, Architecture, Bach, Architecture at Universidade Federal da BahiaBS, Computer Science, BS, Computer Science at Faculdade Ruy BarbosaFrench Course, French Course at CLIC
English, Portuguese, French
Github Skills (21)
unit-testing10
git10
shopify-api10
testing10
payment-integration10
payment-gateway10
rails10
ruby10
localization10
ports10
version-control10
activemerchant10
error-handling10
ruby-on-rails10
documentation10
Programming languages (12)
Github contributions (5)
Shopify/shopify_app
May 2013 - Jul 2017
A Rails Engine for building Shopify Apps
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 commits, 4 PRs, 7 pushes in 4 years 3 months
Contributions summary:Celso primarily focused on improving the Shopify app's core functionality and user experience. They updated the welcome message content, fixed a potential redirect vulnerability, and implemented a login protection mechanism. Furthermore, the user contributed to version bumping and made improvements to the application's configuration and installation process by incorporating Rubocop suggestions. This indicates a focus on maintainability, security, and overall application quality.
rails-enginesshopify-app
activemerchant/offsite_payments
Jun 2014 - Sep 2014
A simple and unified API to handle dozens of different offsite payment pages.
Role in this project:Back-end Developer
Back-end DeveloperContributions:13 commits, 1 PR, 2 comments in 3 months
Contributions summary:Celso primarily contributed to the `offsite_payments` repository by addressing bugs and implementing features related to the PagSeguro payment gateway integration. Their work involved fixing issues with phone number handling, correcting address mappings, and improving the handling of connection timeouts and invalid notification responses. The changes demonstrate a focus on enhancing the robustness and reliability of the PagSeguro integration within the broader payment processing system.
apipaymentspayment-gatewayadyenpayment-processing
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