Hi, I'm Isaac Alves
Software Engineer | Backend Developer
🚀 Passionate about building scalable applications and optimizing system performance. Experienced in backend development, API design, and frontend engineering.
Skills & Technologies
- Backend: Ruby on Rails, Sinatra
- Frontend: React.js, Vue.js, Tailwind CSS
- Database: PostgreSQL, MySQL, SQLite
- DevOps: Docker, Kubernetes, Redis, Sidekiq
- Tools: Linux, Git, Insomnia, Sentry, Grafana
About Me
Software engineer with a strong background in web development, specializing in Ruby on Rails. Skilled in building scalable applications, integrating payment APIs, and improving system reliability through best coding practices.
Work Experience
Umanni | Software Engineer
Dec 2025 — Present
- Led the full decommissioning of the legacy goals module, removing orphaned routes/controllers/scripts/database artifacts while preserving CI and migration stability.
- Fixed critical review/reporting inconsistencies (import-related duplication, identifier/job-role mismatches), improving data trust for HR decision-making.
- Optimized feedback pipelines with batch retrieval and refactored moderation logic to token matching, reducing false positives and improving user experience.
- Tech: Ruby on Rails, ReactJS, PostgreSQL, Docker, Sidekiq
Crescer Technology | Software Engineer
Feb 2025 — Nov 2025
- Worked as a Ruby on Rails developer on a large public healthcare management platform using a multi-engine architecture (surgery scheduling, inpatient admission, TISS billing, ESUS/primary care indicators, immunizations, reports, electronic health record, etc.).
- Led a major refactor of the surgery scheduling module, improving the Surgery Map/Schedule, adding operating room reservation capabilities, and implementing a cancellation flow with mandatory justification and proper auditing.
- Contributed to codebase maintainability by reviewing SQL queries, extracting reusable JS utilities, removing dead code and standardizing naming and comments.
- Tech: Ruby on Rails, PostgreSQL, Docker, Redis
Big Data Health | Software Engineer
Aug 2024 — Jan 2025
- Refactored legacy Ruby on Rails (v4.2) code into modular services, increasing maintainability.
- Improved test coverage and reliability with RSpec and FactoryBot.
- Tech: Ruby on Rails, PostgreSQL, Docker, Kubernetes, Redis, Sidekiq, Sentry
Fetchly Labs | Software Engineer
Jul 2023 — Jun 2024
- Developed and maintained backend services in Ruby on Rails, focusing on performance and scalability.
- Delivered features for clients using Vue.js and Tailwind CSS.
- Tech: Ruby on Rails, PostgreSQL, REST API, Docker, Tailwind CSS, Vue.js
Federal Institute of Piaui | Software Engineer Intern
Mar 2022 — Mar 2023
- Developed and deployed internal systems using Ruby on Rails to support academic and administrative workflows.
- Designed intuitive user interfaces with Tailwind CSS, enhancing usability for non-technical users.
- Promoted clean code practices and teamwork in cross-functional student projects.
- Gained solid experience working with SQL databases, Git workflows, and Linux environments.
- Tech: Ruby on Rails, SQLite3, Tailwind CSS
Featured Projects
Finance App
- Description: Modern personal finance management application built with Ruby on Rails 8, featuring real-time transaction management, custom categories with color coding, and responsive design. Implements Hotwire (Turbo + Stimulus) for instant UI updates without page reloads and includes secure user authentication.
- Tech Stack: Ruby on Rails 8, PostgreSQL, Hotwire (Turbo + Stimulus), TailwindCSS, Devise, RSpec, Docker, Kamal
- View Project
Payment System - API
- Description: Robust payment processing API integrating Mercado Pago and PagSeguro with an automatic fallback system to ensure high transaction reliability. Implemented JWT-based authentication and role-based access control.
- Tech Stack: Ruby on Rails, PostgreSQL, JWT, Mercado Pago API, PagSeguro API, RSpec
- View Project
Payment System - Frontend
- Description: React-based frontend for a payment processing system, featuring a responsive user-friendly payment form and an admin dashboard for transaction tracking. Implemented real-time payment status updates and secure credit card handling.
- Tech Stack: React.js, Tailwind CSS, REST API, Webhooks
- View Project
Hospital Manager
- Description: Medical Office Management System using Ruby on Rails, implementing role-based access for doctors and receptionists. Integrated appointment scheduling and patient record management.
- Tech Stack: Ruby on Rails, PostgreSQL, Role-Based Access Control (RBAC)
- View Project
URL Shortener
- Description: Scalable URL Shortener using Ruby, Sinatra, and MySQL, featuring unique 6-character URL generation, access tracking, and analytics for monitoring link performance.
- Tech Stack: Ruby, Sinatra, MySQL, REST API
- View Project
Education
- Federal Institute of Piaui - Technician in System Development (2021 — 2023)
Let’s Connect
For the fastest response, please use the contact form!
Or connect directly:
- 📧 dev.isaaclvs@gmail.com
- 💻 GitHub
- 📱 +55 86 99980-4586