Jefferson Fernandes Email & Phone Number

São Paulo, Brazil

Alberta, Canada

At ElectionBuddy I help to build accessible democracy around the world with election integrity and voter engagement boost by developing and maintaining a Ruby on Rails application running on AWS.

Remote

- I contributed to enhancing the sales of multiple Shopify merchants through the implementation of A/B Tests for their products- Improved scheduling system by integrating the Node.js API with an external queue API- Developed a novel A/B Test approach with React, enabling users to change the store’s visual elements, improving user engagement- Established the continuous integration/continuous deployment (CI/CD) pipeline connecting Heroku and GitHub- Deployed and maintained their MongoDB cluster- Took a role in product management tasks

During my sabbatical year, I embarked on an enriching journey across Brazil's Northeast, the Amazon Rainforest, Argentina, Chile, and Uruguay. This experience heightened my adaptability, cross-cultural communication skills, problem-solving abilities, and global perspective.

São Paulo, Brazil

- Conducted regular code reviews and provided constructive feedback to enhance team members' coding skills and maintain a high standard of codebase integrity - Mentored team members, contributing to their professional growth and skill development - Collaborated with project managers to assist in task definition, prioritization, and allocation prioritization, streamlining project workflows - Facilitated onboarding for new engineers, ensuring a smooth transition into the team

Remote

I participated in projects that involved diverse technology stacks, teams, and clients. In certain instances, I took on leadership roles, providing guidance to engineers and establishing code standards. - CargoX (logistics technology company): integrated their application (Ruby on Rails + Vue.js) with an OCR API, improving the efficiency of document validation processes and changed their AWS cloud infrastructure using Terraform - Abril Big Data (data company): engineered a data analytics product using Ruby on Rails and established the data processing pipeline from S3 files to ElasticSearch through AWS Data Pipeline and MapReduce (Apache Pig) - JCPM (shopping malls holding group): engineered a marketplace platform using React and Node.js. This platform empowers retailers to broaden their presence across diverse e-commerceplatforms through a unified application. The solution operates as amicroservice on AWS Lambda managed with Terraform - Jornal do Comercio (media company): I created a quiz application using Ruby on Rails and AngularJS to collect customer lead data

São Paulo, São Paulo, Brazil

Maintained a Node.js API for a mobile wallet product

São Paulo, Brazil

I collaborated with several projects from different clients and gained my first experience with web and mainly with Ruby on Rails

São Paulo, Brazil

I worked as a specialist in Microsoft Dynamics AX solutions, got an MCP certification in X++, and worked on several projects with SQL Server, and C#

São Paulo, Brazil

In that ERP Software company, I helped with integrations, small projects in .NET, and reports for managers into SQL Server