Cassiano Sampaio
Software Engineer at Helppi
Paraná, Brazil
Summary
👤
Senior🎓
Top SchoolCassiano Sampaio is a backend-focused Software Engineer with 9 years of experience building and scaling systems primarily with Ruby on Rails, Elixir, and NodeJS. He specializes in architecture, performance tuning, and test-driven development, with hands-on experience moving projects from monoliths to microservices, implementing DDD and event-driven designs. His work at Solvis and other companies dramatically cut query times—from multi-hour reports to near-instant results after migrating to ClickHouse—and improved CI/CD reliability and cost-efficiency. Cassiano frequently owns queue-heavy integrations and microservice communication fixes, and has contributed meaningful refactors and reporting accuracy improvements to the rubyforgood/casa nonprofit repo. A practiced mentor and communicator, he fosters team growth through pair programming, brown-bag sessions, and standards for clean architecture. Based in Paraná, Brazil, he pairs a curious, continuous-learning mindset with pragmatic engineering that balances product needs and system resilience.
8 years of coding experience
6 years of employment as a software developer
Web Development Post Graduation Web Development Technologies, Web Development Post Graduation Web Development Technologies at UniGuairacá Centro UniversitárioBachelor's degree Computer Science, Bachelor's degree Computer Science at Universidade Estadual do Centro-Oeste
Portuguese, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (8)
rspec10
ruby-rails10
rails10
ruby-on-rails10
ruby10
casa8
sql7
git6
Programming languages (5)
Github contributions (5)
rubyforgood/casa
Oct 2020 - Oct 2020
Volunteer management system for nonprofit CASA, which serves foster youth in counties across America.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 reviews, 8 commits, 5 PRs in 8 days
Contributions summary:Cassiano primarily focused on bug fixes and refactoring in the Ruby on Rails application. Their contributions involved modifying the application's scopes, filtering logic, and report generation capabilities, specifically concerning case contact reports. They also refactored code to remove misleading parameters and adjusted tests for improved readability. The changes span across model, request, and system spec files suggesting a focus on improving data accuracy and reporting functionality.
servesyouthr4gmanagement-systemcasa
cassianoblonski/goof
Nov 2021 - Mar 2025
Super vulnerable todo list application
Contributions:34 PRs, 74 pushes, 71 branches in 3 years 3 months
vulnerablenodejstodo-listtodo
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.