Santiago is available for hire
Hire SantiagoSantiago Perez
Verified Expert in Engineering
Full-stack Developer
Caracas, Capital District, Venezuela
Toptal member since March 23, 2021
Bio
Santiago is a full-stack developer with over eight years of experience delivering high-quality software for clients in the United States, Mexico, and Germany. Santiago specializes in Ruby on Rails and React and enjoys transforming loose ideas and user feedback into actionable requirements and readable, well-tested code.
Portfolio
Self-Employed
Ruby on Rails (RoR), Stimulus, Hotwire
Alto Azareo
Ruby on Rails 7, Amazon Web Services (AWS)
higo
React, Ruby on Rails (RoR), Python, Full-stack, Banking & Finance, Finance
Experience
- Ruby - 8 years
- Ruby on Rails (RoR) - 8 years
- Heroku - 5 years
- Git - 5 years
- RSpec - 5 years
- JavaScript - 5 years
- Capybara - 5 years
- React - 4 years
Availability
Part-time
Preferred Environment
MacOS, Git
The most amazing...
...thing I've built—as a solo developer—was a full personal finance tracking app using Ruby on Rails.
Work Experience
Full-stack Developer
2022 - PRESENT
Self-Employed
- Built an MVP for an accounting and invoice reconciliation service.
- Built integrations with fiscal and banking information providers to automate invoice reconciliation.
- Created a full system for a B2B payments wallet and applied for a Mexican IFPE license (pending).
- Created an integration with the Mexican central bank's (Banxico) instant payments platform (SPEI) through a third-party provider.
Technologies: Ruby on Rails (RoR), Stimulus, Hotwire
Technical Lead
2023 - 2024
Alto Azareo
- Built a full-stack B2B payments app as a solo developer.
- Applied for and obtained a fintech license in Mexico.
- Sold the company to a larger company after 18 months.
Technologies: Ruby on Rails 7, Amazon Web Services (AWS)
Technical Lead
2021 - 2022
higo
- Helped grow a B2B payments app from tens to hundreds of business clients, moving in the tens of millions of USD through our rails.
- Grew a team of three up to 10+ engineers, leading the sourcing and interviewing process.
- Provided mentorship and architectural feedback to the team, helping implement better continuous delivery practices, on top of individual contributions to new features and improvements.
Technologies: React, Ruby on Rails (RoR), Python, Full-stack, Banking & Finance, Finance
Full-stack Developer
2020 - 2021
Meet Edgar
- Built the back end for multi-user collaboration and several parts of the front end for the said feature.
- Improved integrations with LinkedIn by allowing a separate connection for personal and organization accounts.
- Improved test coverage by introducing integration tests for GraphQL endpoints and React components.
Technologies: Ruby on Rails (RoR), React, RSpec, Jest, Full-stack
Full-stack Developer
2018 - 2020
FormKeep
- Added a collaboration functionality to allow multiple users to configure and manage a form.
- Implemented file uploads to the form-endpoints using ActiveStorage and S3.
- Integrated Slack and Google Sheets to enable syncing form submission to these services.
- Incorporated a drag-n-drop form builder to allow non-technical users to create forms.
Technologies: Ruby on Rails (RoR), JavaScript, RSpec, Capybara, Full-stack
Full-stack Developer
2018 - 2018
Store2be
- Updated an analytics report generation tool to use a GDPR-compliant service.
- Worked remotely as part of the team for their Berlin office.
- Tracked and fixed bugs and minor improvements on a set of Ruby on Rails and React apps.
Technologies: Ruby on Rails (RoR), React, Full-stack
Full-stack Developer
2017 - 2017
Talent Hack
- Developed a full MVP for a job board for the fitness industry as a solo developer.
- Added a search-and-filtering functionality to help fitness professionals find job openings.
- Built an interview appointment system to make it easier for managers to handle applications.
Technologies: Ruby on Rails (RoR), React, RSpec, Full-stack
Front-end Developer
2016 - 2016
Zomoz
- Helped develop the front end of the web application using Angular 2 that also consumed a REST API.
- Created an availability calendar for tour providers to configure their schedules.
- Designed and implemented a library to simplify the consumption of the API from the front end.
Technologies: Angular, Node.js
Experience
PocketPatch
PocketPatch is a Ruby on Rails web application for personal finance management. It allows users to connect their bank accounts through Plaid and classifies their expenses automatically using a machine learning (ML) model.
I built both the main Ruby on Rails application that interfaces with Plaid and serves the UI and a small service that hosts the ML models (ClassyMoney).
I built both the main Ruby on Rails application that interfaces with Plaid and serves the UI and a small service that hosts the ML models (ClassyMoney).
Rails by Example
http://github.com/railsbyexampleA compilation of Ruby on Rails example apps that showcase small problems I've had to solve with Rails. I hope to grow it over time and eventually add more detailed explanations through a blog. So far, I have published three repositories and have code for the other three examples that I still need to clean up.
Weekalyze
I built, for personal use, this simple calendar with a to-do list, a day planner, and a habit tracker using Ruby on Rails. It was mostly an experiment for using Hotwire and the latest tooling for Rails front-end interactions but I'm still working on improving it.
ClassyMoney
A small Flask-based service to categorize (classify) financial transactions according to a user's previous categorization. It provides an endpoint to fit a machine learning model and one to make predictions with it. It complements PocketPatch.
Education
2013 - 2017
Engineer's Degree in Systems Engineering
Universidad Metropolitana - Caracas, Venezuela
Skills
Libraries/APIs
React, Scikit-learn, Plaid API, Node.js
Tools
RSpec, Git, Hotwire
Languages
Ruby, JavaScript, Python
Frameworks
Ruby on Rails (RoR), Capybara, Stimulus, Flask, Angular, Jest, Ruby on Rails 7
Paradigms
Database Design
Platforms
Heroku, MacOS, Amazon Web Services (AWS)
Storage
PostgreSQL
Industry Expertise
Banking & Finance
Other
Full-stack, Computer Science, Finance, Unix Shell Scripting
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