Andre is available for hire
Hire AndreAndre Romeiro Ferrer
Verified Expert in Engineering
Software Engineer and Developer
Rio de Janeiro - State of Rio de Janeiro, Brazil
Toptal member since September 25, 2023
Bio
Andre is a full-stack software engineer focused on helping startups implement all sorts of digital solutions. Specialized in many technologies, including Ruby, Heroku, and Sinatra, he's always eager to learn new skills. Andre has led and worked collaboratively with cross-functional teams to create solutions and testing processes, particularly in the edtech and fintech industries. In addition, he's soon to obtain a master of business administration in finance.
Portfolio
Winsbeslis Drie En Twintig (Edms)Bpk T/A Ultimate Services
Ruby on Rails (RoR), Web Development
Decisiv
Ruby on Rails API, Ruby, RSpec, React, Haml, HTML, CSS, JavaScript, Bootstrap...
Trader Bot
Ruby, Sinatra, RSpec, Amazon Web Services (AWS), Serverless, Amazon DynamoDB...
Experience
- APIs - 5 years
- Ruby on Rails API - 5 years
- Ruby - 5 years
- RSpec - 5 years
- Ruby on Rails (RoR) - 5 years
- Sinatra - 3 years
- Heroku - 3 years
- React - 2 years
Availability
Part-time
Preferred Environment
Slack, Ubuntu, Windows, MacOS, Ruby on Rails (RoR), Ruby, Sinatra
The most amazing...
...system I've developed is a stock option trading bot for a German client who has now retired thanks to the bot's success.
Work Experience
Ruby Developer and Rails Upgrade Specialist
2023 - 2023
Winsbeslis Drie En Twintig (Edms)Bpk T/A Ultimate Services
- Developed a plan to upgrade an old Rails application from version 2.3.15 to the current version.
- Upgraded an outdated Ruby application, strategically advancing from version 1.9.2 to the latest version.
- Collaborated with a cross-skilled team to define the upgrade of a Rails application while maintaining all existing features and not stopping the current app.
Technologies: Ruby on Rails (RoR), Web Development
Senior Full-stack Engineer
2022 - 2023
Decisiv
- Developed and implemented features using Ruby on Rails (RoR) and PostgreSQL, ensuring high performance, scalability, and maintainability.
- Collaborated with cross-functional teams to design and implement responsive user interfaces using React, AngularJS, Haml, HTML, CSS, and Bootstrap, resulting in intuitive and visually appealing user experiences.
- Developed and maintained test suites using RSpec and conducted rigorous unit and integration testing to ensure code quality, detect bugs, and prevent regressions in the software application.
Technologies: Ruby on Rails API, Ruby, RSpec, React, Haml, HTML, CSS, JavaScript, Bootstrap, PostgREST, Twilio, AngularJS, Ruby on Rails (RoR), PostgreSQL, Back-end, Microservices, Databases, Full-stack, Web Development
Freelance Full-stack Software Engineer
2021 - 2022
Trader Bot
- Designed and developed RESTful and GraphQL APIs and back-end services using Ruby, Sinatra, and PostgreSQL, ensuring high performance, scalability, and data integrity for mission-critical applications.
- Implemented serverless architecture using AWS Lambda and Amazon DynamoDB, reducing infrastructure costs and improving the system's scalability and availability.
- Leveraged GraphQL to design efficient and flexible data query and manipulation layers, optimizing data retrieval and reducing network overhead for front-end applications.
Technologies: Ruby, Sinatra, RSpec, Amazon Web Services (AWS), Serverless, Amazon DynamoDB, GraphQL, PostgreSQL, AWS Lambda, Back-end, Microservices, Databases, Full-stack, Finance, Banking & Finance, Web Development
Teacher and Manager
2019 - 2022
Le Wagon
- Mentored almost 1,000 students on various technologies, including Ruby on Rails (RoR) and Heroku. This foundation strengthened my expertise as a senior full-stack engineer.
- Led the transition to Le Wagon's online school, showcasing my adaptability and innovation in full-stack development.
- Collaborated with Le Wagon's schools from London to Dubai, bridging time zones and ensuring seamless project flows despite distances and remote working.
- Guided teams at Le Wagon, enhancing my leadership skills.
Technologies: Ruby on Rails (RoR), Heroku, HTML, CSS, JavaScript, SQL, PostgreSQL, Git, GitHub, MVC Design, Object-oriented Programming (OOP), APIs, REST, Back-end, Databases, Full-stack, Stimulus, Web Development
Full-stack Software Engineer
2020 - 2021
Cupom do Bem
- Led and coordinated a team of three developers, spearheading the creation of a state-of-the-art Chrome extension. Our primary focus was introducing innovative design concepts, ensuring that the extension met and exceeded user expectations.
- Leveraged Ruby on Rails (RoR), HTML, CSS, and JavaScript to develop a reliable platform, enhancing user responsiveness and efficiency.
- Deployed the product successfully upon completion, merging it with a complementary web application. The outcome was a marked improvement in functionality, offering users an unparalleled browsing experience that was intuitive and engaging.
Technologies: Ruby on Rails (RoR), RSpec, HTML, CSS, JavaScript, Bootstrap, PostgreSQL, Back-end, Databases, Full-stack, Web Development
Full-stack Developer
2019 - 2020
Coloc Housing
- Teamed with experts to enhance our SaaS service similar to Airbnb but for long-term stays in Belgium.
- Bridged server and client-side operations, uplifting user experiences using Ruby on Rails (RoR), HTML, CSS, and JavaScript.
- Focused on front-end development, utilizing HTML, CSS, and JavaScript to tailor interfaces for renters and owners and enhance platform usability.
- Ensured the codebase's robustness through thorough code reviews and pair programming.
- Collaborated with product and design teams, translating user needs into tech solutions and guaranteeing high customer satisfaction through active troubleshooting.
Technologies: Ruby on Rails (RoR), HTML, CSS, JavaScript, Bootstrap, PostgreSQL, Back-end, Databases, Full-stack, Web Development
Experience
Comprehensive Repository of 50+ Ruby on Rails (RoR) Projects: From Basics to Advanced Web Features
https://github.com/andrerferrer/dedemosI've curated the "DeDémos Rails" repository to display my proficiency in various Ruby on Rails (RoR) ecosystem features. This expansive repository is a testament to my technical finesse, showcasing detailed demos from ActiveRecord operations to GraphQL implementation in Rails.
The repository is intricately segmented into topics like Active Storage, Ajax in Rails, background jobs, ActionCable, WebSockets, date handling, Devise, GraphQL, Geocoder, Pundit, QR code generation and reading, searching and filtering, and tagging.
This repository is a culmination of various projects and references that I've painstakingly assembled to assist developers and highlight my expertise. My focus in each demo was to explain complex procedures in digestible steps. Additionally, my repository expands beyond just Rails; it touches on Ajax, Stimulus, Devise, Pundit, and Geocoder.
The repository is intricately segmented into topics like Active Storage, Ajax in Rails, background jobs, ActionCable, WebSockets, date handling, Devise, GraphQL, Geocoder, Pundit, QR code generation and reading, searching and filtering, and tagging.
This repository is a culmination of various projects and references that I've painstakingly assembled to assist developers and highlight my expertise. My focus in each demo was to explain complex procedures in digestible steps. Additionally, my repository expands beyond just Rails; it touches on Ajax, Stimulus, Devise, Pundit, and Geocoder.
Skills
Libraries/APIs
Ruby on Rails API, React, PostgREST, Devise, Pundit, ActiveRecord
Tools
Slack, RSpec, Git, GitHub, Geocoder
Languages
Ruby, JavaScript, Haml, HTML, CSS, GraphQL, SQL
Frameworks
Ruby on Rails (RoR), Bootstrap, AngularJS, Sinatra, Stimulus
Paradigms
Microservices, MVC Design, Object-oriented Programming (OOP), REST
Storage
Databases, Amazon DynamoDB, PostgreSQL
Platforms
Ubuntu, Windows, Twilio, Amazon Web Services (AWS), Heroku, AWS Lambda, MacOS
Industry Expertise
Banking & Finance
Other
APIs, Full-stack, Web Development, Back-end, Serverless, Ajax, WebSockets, Background Jobs, QR Codes, Finance
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