Fernando is available for hire
Hire FernandoFernando Maymone
Verified Expert in Engineering
Full-stack Developer
Location
Fortaleza, Brazil
Toptal Member Since
March 6, 2019
Fernando is a full-stack developer with over 15 years of experience in a wide range of software development roles. He excels as a solo developer, team member, team leader, or as a manager of multiple distributed teams. He works closely with clients to define ideas and deliver products. Fernando also has a bachelor's in CS, a master's in mobile development, and he specializes in Ruby on Rails, JavaScript, React, React Native and Java.
Portfolio
Villager Events Inc.
React Native, TypeScript, iOS, Jest, Android, Stripe, SVG
Communal Coffee LLC.
APIs, Shopify, Square, Amazon Web Services (AWS), Google Cloud Platform (GCP)...
RedKangaroo, INC.
React Native, Node.js, Firebase, iOS, React Native for Web, Android...
Experience
Availability
Part-time
Preferred Environment
OS X, Visual Studio Code (VS Code), Vim Text Editor, Google APIs
The most amazing...
...thing I've done was to develop, in a team, Brazil’s electronic voting machine—becoming the first country to have elections done with electronic systems.
Work Experience
Apple/React Native Developer
2024 - 2024
Villager Events Inc.
- Implemented the new official Stripe Terminal React Native library.
- Implemented a new architecture for the payments using hooks.
- Fixed numerous re-rendering issues and refactors for the Stripe flow.
Technologies: React Native, TypeScript, iOS, Jest, Android, Stripe, SVG
Shopify/Square Expert
2023 - 2023
Communal Coffee LLC.
- Developed an app to integrate Shopify and Squarespace inventory.
- Built a mobile app using React Native and the back end using Node.js.
- Implemented a complete CI/CD for the middleware gateway.
- Created a data pipeline for the events received and processed.
Technologies: APIs, Shopify, Square, Amazon Web Services (AWS), Google Cloud Platform (GCP), Square API, Shopify API, Databases, TypeScript, Jest, Custom Shopify Apps
Full-stack React Native Developer
2023 - 2023
RedKangaroo, INC.
- Led the development and deployment of a production-ready blockchain application, leveraging Node.js, AWS services, and React Native.
- Architected and managed a scalable AWS infrastructure for the blockchain app, optimizing resources and maintaining high performance.
- Utilized React Native to create a cross-platform mobile application, providing users with a consistent experience on both iOS and Android devices.
Technologies: React Native, Node.js, Firebase, iOS, React Native for Web, Android, Stripe Payments, Jest
Senior Full-stack Developer
2023 - 2023
Top Cheddar LLC
- Leveraged Spring Boot, Java, Postgres, and React to develop a high-performance application, enhancing its functionality and ensuring smooth user experiences.
- Orchestrated the seamless deployment of the application on Amazon Web Services (AWS), optimizing resource utilization and ensuring high availability. This led to improved scalability and reduced operational costs.
- Skillfully integrated the application with Stripe payment processing, enabling secure and efficient online transactions. This integration contributed to a substantial increase in revenue and customer trust.
Technologies: Node.js, React, Full-stack, Data Visualization, Amazon Web Services (AWS), Payment APIs, Accounting, Billing, Finance, Dashboards, D3.js, Charts, Figma, Stripe Payments
Back-end Senior RoR Developer
2022 - 2022
Beyond Finance
- Developed an app that syncs all the Salesforce data from a legacy company to a React and Ruby stack.
- Researched and planned the new back-end architecture, including databases, queues, and infrastructure for the app.
- Implemented an async process to make all the documents for the partners being exchanged within the new app.
Technologies: Ruby on Rails (RoR), PostgreSQL, TypeScript, HTML, CSS, Amazon S3 (AWS S3), APIs, Agile Software Development, Ruby on Rails 5, Full-stack, Ruby, Amazon Web Services (AWS), Cloud, Agile, Responsive Design, User Interface (UI), User Experience (UX), Responsive Web Apps, GitHub, GraphQL, Docker, GraphQL API, REST APIs, Payment APIs, RSpec, CI/CD Pipelines, Git, OAuth 2, Back-end, Microservices Architecture, Microservices, Back-end Development, Finance, Billing, Accounting, Stripe Payments
Lead Full-stack Developer - React/RoR
2021 - 2022
Marchex
- Designed, implemented, and maintained the Marchex app that enhances communication using multiple messaging systems such as SMS, Skype, and voice calls.
- Developed an auto-response feature for the existing React app, allowing the marketing team to reach their goals faster.
- Researched, planned, developed, and delivered a new back-end architecture to improve processes on the app.
- Implemented the new mobile app using React-Native for the marketing campaign team.
- Led processes to track, diagnose, and fix bugs on the project using Trello, Jira, and GitHub.
Technologies: Ruby on Rails (RoR), React, Ruby on Rails 5, Elasticsearch, Ruby, Cloud, Next.js, Agile, Responsive Design, User Interface (UI), Responsive Web Apps, GitHub, DevOps, Firebase Cloud Functions, Google Maps, Material UI, Docker, REST APIs, Amazon, Amazon API, Mobile Development, Mobile Apps, Mobile App Development, Technical Architecture, Front-end, Styled-components, Payment APIs, Stripe Checkout, CI/CD Pipelines, Git, DevOps Engineer, Back-end, Microservices Architecture, Microservices, Back-end Development, Accounting, Google+ API, React Native for Web, Stripe Payments, Jest
Lead Full-stack Developer
2020 - 2022
Sonar
- Led a team of four developers to build an application for the fashion industry.
- Developed an application using Ruby on Rails for the back end and Reach for the front end.
- Introduced and implemented the concept of continuous integration and automated testing within the company.
- Developed and maintained the React front-end for the company.
- Provisioned and maintained servers as well as various other AWS services for the entire company.
- Migrated the existing infrastructure to a much more maintainable Docker Swarm.
Technologies: React, SendGrid API, Stripe API, HTML, CSS, Amazon S3 (AWS S3), APIs, Agile Software Development, Google APIs, Twilio API, JavaScript, Full-stack, Ruby, Amazon Web Services (AWS), Elasticsearch, Stripe, Functional Programming, Geospatial Data, Cloud, Agile, Responsive Design, User Interface (UI), User Experience (UX), Responsive Web Apps, GitHub, Data Visualization, Material UI, Kubernetes, Docker, Apache Kafka, Documentation, REST APIs, Amazon, Amazon API, Mobile Development, Mobile Apps, Mobile App Development, Technical Architecture, Front-end, Styled-components, Payment APIs, Stripe Checkout, Stripe Subscriptions, RSpec, ActiveAdmin, CI/CD Pipelines, Stripe Connect, Git, GitOps, OAuth 2, Back-end, Microservices Architecture, Microservices, Back-end Development, Accounting, React Native for Web, Stripe Payments, Jest
Senior Full-stack Developer
2020 - 2020
OneClickPolitcs
- Developed and maintained features for a legacy application in Ruby on Rails and React.
- Developed a client to integrate with the White House system, using the CWC protocol to send messages to congressmen.
- Developed an integration with the Twilio SMS API to send messages to congressmen.
Technologies: Redux, React, Ruby on Rails (RoR), HTML, CSS, Amazon S3 (AWS S3), APIs, Agile Software Development, Ruby on Rails 5, JavaScript, Full-stack, Ruby, SQL, Amazon Web Services (AWS), Elasticsearch, Heroku, Cloud, Agile, Responsive Design, Responsive Web Apps, GitHub, DevOps, GraphQL, Cloudflare, Data Visualization, Google Maps, Material UI, REST APIs, Front-end, Styled-components, RSpec, ActiveAdmin, CI/CD Pipelines, Git, OAuth 2, Angular, Back-end, Express.js, Microservices Architecture, RabbitMQ, Microservices, Back-end Development, React Native for Web
Senior Full-stack Developer
2020 - 2020
Ho2pe
- Developed an app where users worldwide could create a collaborative piece of art, drawing on the screen in real-time.
- Built the application using React Native for the front end and Firebase for the back end.
- Created a CI/CD pipeline with GitHub and Google Clouds.
Technologies: Redux, Firebase, React Native, React, HTML, CSS, APIs, Agile Software Development, Ruby on Rails 5, JavaScript, Full-stack, Ruby, Node.js, SQL, Functional Programming, Cloud, Agile, Responsive Design, Responsive Web Apps, GitHub, DevOps, Firebase Cloud Functions, Data Visualization, Material UI, Documentation, REST APIs, Mobile Development, Mobile Apps, Mobile App Development, Front-end, Styled-components, Git, DevOps Engineer, Back-end, Microservices, Back-end Development, UI Design, UX Design, Billing, iOS, React Native for Web, Android, Jest, SVG
React Native Developer
2019 - 2019
Atiz Fashion Tech
- Developed a React Native mobile app for the Fashion World that connects customers and the clothes industry.
- Architected the back end of the app using Firebase serverless technology.
- Deployed and created a CI/CD for the company using AWS and Kubernetes.
Technologies: React Native, iOS 12, REST APIs, Amazon, Mobile Development, Mobile Apps, Mobile App Development, Front-end, Styled-components, Bitbucket, Git, Back-end, Microservices, UI Design, UX Design, Finance, Billing, Google+ API, iOS
Full-stack Developer
2019 - 2019
Owens Corning
- Worked on a project to deliver a new wall builder feature for Owen Corning using React, jQuery, and GraphQL.
- Developed the front-end solutions, servers, and AWS services and migrated the existing infrastructure to Docker Swarm.
- Integrated a Stripe API for payments and subscriptions and delivered configurations for CI/CD using Docker and Kubernetes.
Technologies: Redux, React, Ruby on Rails (RoR), HTML, CSS, APIs, Agile Software Development, Google APIs, SendGrid API, Ruby on Rails 5, JavaScript, Full-stack, Ruby, SQL, Amazon Web Services (AWS), Heroku, Cloud, Next.js, Agile, Responsive Design, GitHub, GraphQL, Data Visualization, Material UI, Docker, Documentation, GraphQL API, REST APIs, Styled-components, Bitbucket, RSpec, ActiveAdmin, CI/CD Pipelines, Git, Microservices Architecture, Back-end Development, Finance, React Native for Web
Lead Full-stack Developer - React/RoR
2018 - 2019
Sculp
- Led processes to develop and maintain a Ruby-based API for Sculp. Implemented CI processes and automated tests on solutions.
- Introduced and implemented the concept of continuous integration as well as automated testing within the company.
- Developed and maintained the React front end for the company.
- Worked on the front end solutions, servers, and AWS services. Migrated the existing infrastructure to Docker Swarm.
- Integrated Stripe API for payments, subscriptions, and VAT return preparations for the clients and clients of the platform.
- Integrated SendGrid with the Twillio API for notifications on the app.
- Delivered configurations for CI/CD using Docker and Kubernetes.
- Integrated Elasticsearch for all the Talent searches related to the app.
Technologies: Redux, Stripe, Elasticsearch, PostgreSQL, Next.js, React, Ruby on Rails (RoR), HTML, CSS, APIs, Agile Software Development, Ruby on Rails 5, JavaScript, Full-stack, Ruby, SQL, Amazon Web Services (AWS), Agile, Responsive Design, GitHub, DevOps, GraphQL, Data Visualization, Google Maps, Material UI, Kubernetes, Docker, REST APIs, Amazon API, Mobile Development, Mobile Apps, Mobile App Development, Technical Architecture, Front-end, Styled-components, Payment APIs, Stripe Checkout, Subscriptions, Subscription Processing, VAT Return Preparation, RSpec, ActiveAdmin, CI/CD Pipelines, Stripe Connect, Git, GitOps, DevOps Engineer, Maps, Google Maps API, Back-end, Microservices Architecture, Back-end Development, Finance, Billing, Accounting, Google+ API, iOS, React Native for Web
Full-stack Developer
2018 - 2018
Wistrack
- Developed and maintained a Ruby on Rails app to the company.
- Introduced and implemented the concept of continuous integration as well as automated testing within the company.
- Migrated the existing infrastructure to a much more maintainable Docker Swarm.
- Created a new API for the ADMIN session with Node.js.
Technologies: jQuery, Ruby on Rails (RoR), HTML, APIs, Agile Software Development, Google APIs, SendGrid API, Ruby on Rails 5, Full-stack, Ruby, Node.js, SQL, Agile, Responsive Design, GitHub, DevOps, Data Visualization, Docker, Documentation, REST APIs, Amazon API, Front-end, Styled-components, ActiveAdmin, Git, Maps, Back-end, Back-end Development, Google+ API
Full-stack Developer
2017 - 2018
Timeslot
- Developed and maintained an API (Ruby on Rails) to the company.
- Created a mobile app (React Native) to the company.
- Provisioned and maintained servers as well as various other AWS services for the entire company.
- Developed a new API for the Marketing team with Node.js.
Technologies: Amazon Web Services (AWS), Firebase, Heroku, Stripe, Ruby on Rails (RoR), React Native, HTML, SendGrid API, Ruby on Rails 5, JavaScript, Full-stack, Ruby, SQL, Agile, Responsive Design, GitHub, Amazon API, Front-end, Styled-components, Stripe Checkout, Git, DevOps Engineer, Back-end, Back-end Development
Full-stack Developer
2016 - 2017
Estacio
- Researched, designed, and implemented a World Cup betting app for the 2018 Russia World Cup.
- Developed and maintained a Ruby on Rails API to the app.
- Developed a mobile app using React Native.
- Created a testing framework to ensure data integrity with regression testing.
- Provisioned and maintained servers as well as various other AWS services for the entire company.
Technologies: Firebase, Node.js, Ruby on Rails (RoR), React Native, JavaScript, Full-stack, Ruby, Agile, GitHub, Firebase Cloud Functions, GraphQL, Git, Back-end, Back-end Development
Full-stack Developer
2016 - 2017
Coca-Cola
- Developed an application for a market campaign that generates personal videos for users and also publishes it on YouTube.
- Built all of the back end (Java) for video processing and publishing.
- Managed the CD/CI of the entire solution.
- Collaborated closely with other team members to plan, design, and develop solutions.
Technologies: YouTube API, Facebook API, React, Java, JavaScript, Full-stack, Ruby, Agile, GitHub, Back-end Development, Google+ API
Full-stack Developer
2015 - 2016
Chef-Made
- Researched, designed, and implemented an application similar to Airbnb for chefs in the neighborhood.
- Developed and maintained an API (Ruby on Rails) for the company.
- Built and maintained the front-end and mobile app for the company.
- Provisioned and maintained servers as well as various other AWS services for the entire company.
- Created the infrastructure of the app using Docker Swarm.
Technologies: Firebase, Ruby on Rails (RoR), React, React Native, JavaScript, Full-stack, Ruby, SQL, Stripe, Technical Architecture
IT Architect
2007 - 2011
Cielo
- Developed a solution for the integration of a mobile module on systems TEF; included the mobile TEF architecture.
- Studied the new operating system on POS machines and developed a new application for testing.
- Constructed a system to perform loading applications remotely into POS (Telecarga).
- Oversaw and was responsible for the UML patterns of the architecture area.
- Built and trained teams in a UML methodology for the company.
- Developed an integrated environment for modeling of new architectures based on RUP.
- Automated the generation process of architecture artifacts.
- Integrated the business processes area through Wiki technology based on concepts of enterprise architecture.
- Created a standard for representation of high-platform systems using UML.
- Participated in a project involving multiple credit cards.
- Worked as the lead architect in the governance and quality of the architecture area.
- Implemented processes, deliverables quality and patterns.
- Generated architectural views (Zachman) of process representation, process specification, network representation, and network specification for the entire IT environment.
Technologies: C, C++, Technical Architecture, Stock Market, Stock Exchange, Finance, Accounting
Researcher (MSc Student)
2005 - 2007
Federal University of Pernambuco
- Worked in the area of augmented reality (AR) in various projects.
- Developed for Techpetro various technologies such as augmented reality without markers and 3D reconstruction.
- Constructed various services using augmented reality in ambient networks for A2: Augmented Ambients.
Technologies: C++, C, Java, Maps, GIS
Software Architect
2004 - 2005
CESAR | Troller Jeeps
- Developed an embedded system to store information about the Troller jeeps using CAN bus.
- Built a back end in Java to receive the information for the cars beyond a 3G network.
Technologies: C, C++, Technical Architecture, Maps, GIS
Software Developer
2003 - 2004
Diebold Procomp
- Developed and designed the hardware and software solution for Brazil's voting system.
Technologies: C, C++, Java
Experience
Cielo Projects
https://www.cielo.com.br/MOBILE TEF ARCHITECTURE
• Developed a solution for the integration of a mobile module on systems TEF.
TELECARGA
• Created a system to perform loading applications remotely into a POS.
POS WEB
• Studied the new operating system on POS machines and developed a new application for testing.
TASKS
• Oversaw the UML patterns of the architecture area
• Constructed and trained teams in a UML methodology for the company.
• Developed an integrated environment for modeling new architectures based on RUP.
• Automated the generation process of architecture artifacts.
• Integrated the "business processes" area through Wiki technology based on concepts of enterprise architecture.
• Standardized the representation of high-platform systems using UML.
• Contributed to a project involving multiple credit cards.
• Became the lead architect in the governance and quality of architecture area—implementing processes and deliverables (quality and patterns) and generating architectural views (Zachman) of process representation, process specification, network representation, and network specification for the entire IT environment.
• Developed a solution for the integration of a mobile module on systems TEF.
TELECARGA
• Created a system to perform loading applications remotely into a POS.
POS WEB
• Studied the new operating system on POS machines and developed a new application for testing.
TASKS
• Oversaw the UML patterns of the architecture area
• Constructed and trained teams in a UML methodology for the company.
• Developed an integrated environment for modeling new architectures based on RUP.
• Automated the generation process of architecture artifacts.
• Integrated the "business processes" area through Wiki technology based on concepts of enterprise architecture.
• Standardized the representation of high-platform systems using UML.
• Contributed to a project involving multiple credit cards.
• Became the lead architect in the governance and quality of architecture area—implementing processes and deliverables (quality and patterns) and generating architectural views (Zachman) of process representation, process specification, network representation, and network specification for the entire IT environment.
Electronic Voting System
https://www.tse.jus.br/I worked on the design of the hardware and software solution for Brazil's voting system.
My task was to analyze and develop the recovery module in the system. All of the hardware and software specifications were made using standard UML. It was developed using the programming languages: C, C++, and Assembly.
My task was to analyze and develop the recovery module in the system. All of the hardware and software specifications were made using standard UML. It was developed using the programming languages: C, C++, and Assembly.
Booksculp
Booksculp is an app to join clients and fashion talents all over the America.
Skills
Languages
Java, JavaScript, Ruby, SQL, TypeScript, HTML, CSS, GraphQL, C++, C
Frameworks
Ruby on Rails (RoR), React Native, Redux, Ruby on Rails 5, Material UI, Jest, Next.js, OAuth 2, Angular, Express.js
Libraries/APIs
Stripe, React, Node.js, Stripe API, REST APIs, Shopify API, Google+ API, React Native for Web, jQuery, Google APIs, SendGrid API, Google Maps, Stripe Connect, Google Maps API, Square API, YouTube API, Facebook API, Twilio API, Amazon API, D3.js
Tools
GitHub, RSpec, Git, RabbitMQ, Spreadsheets, Microsoft Excel, Stripe Checkout, Bitbucket, GIS, Vim Text Editor, Illustrator CC, Figma
Paradigms
Agile Software Development, Agile, Mobile Development, Microservices Architecture, Microservices, Functional Programming, DevOps, UI Design, UX Design
Platforms
Shopify, Heroku, Firebase, Kubernetes, Docker, Apache Kafka, iOS, Visual Studio Code (VS Code), OS X, Amazon Web Services (AWS), Amazon, iOS 12, Android, Google Cloud Platform (GCP)
Industry Expertise
Accounting
Other
Full-stack, APIs, Cloud, Responsive Design, User Interface (UI), Responsive Web Apps, Firebase Cloud Functions, Data Visualization, Documentation, Mobile Apps, Mobile App Development, Technical Architecture, Front-end, Styled-components, Payment APIs, ActiveAdmin, CI/CD Pipelines, Maps, Back-end, Back-end Development, Finance, Billing, Stripe Payments, SVG, Custom Shopify Apps, Geospatial Data, User Experience (UX), Cloudflare, GraphQL API, Stripe Subscriptions, Subscriptions, Subscription Processing, VAT Return Preparation, GitOps, DevOps Engineer, Stock Exchange, Artificial Intelligence (AI), Shopify Customizations, AWS DevOps, Stock Market, Dashboards, Charts, Square
Storage
Elasticsearch, PostgreSQL, Amazon S3 (AWS S3), MySQL, Databases
Education
2016 - 2018
Master´s Degree in Mobile Development
Estacio - Fortaleza, Brazil
2004 - 2006
Master´s Degree in Augmented Reality
Federal University of Pernambuco - Recife, Brazil
1999 - 2004
Bachelor's Degree in Computer Science
Federal University of Pernambuco - Recife, Brazil
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