João Maia

I oversee the Authorization & Clearing OnUs platform, which authorizes private label transactions and other operations for credit and debit cards. In this role, I manage Software and Quality Engineers, provide customer support, and collaborate closely with the Technical Product Owner on backlog prioritization. Additionally, I am responsible for managing the authorization tribe's on-call schedule.

Tech Stack: Java, VB, Go, Microservices, Cloud Infrastructure, Payment Systems, API Gateway, CI/CD, Monitoring & Observability

Led the growth and structuring of the data team, encompassing Data Governance, Data Platform, and Data Insights, expanding from 2 to 12 engineers. Facilitated daily retrospectives and planning ceremonies. Conducted 1:1 meetings with all team members. Supported career growth through individual development plans and formulated tactical OKRs for the data team. Proposed new solutions and architectures to address technical debt and scalability challenges. Translated business priorities into actionable team activities.

Tech Stack: Data Engineering, Data Governance, Data Platform, Python, SQL, Cloud Data Services, ETL/ELT Pipelines, Data Warehousing, Business Intelligence Tools

Led the PCI DSS environment and API Gateway team, providing clear direction and mentorship to achieve team goals. Ensured a safe and productive work environment while supporting the career growth of team members. Managed infrastructure costs and tools, ensuring cost-effective and efficient operations. Reported results using the Flighting Levels framework and authored comprehensive documentation for compliance and other purposes.

Tech Stack: PCI DSS, API Gateway, Infrastructure Management, Flighting Levels Framework

Maintained a legacy PCI DSS-compliant environment, implementing best practices in software engineering and DevOps to ensure security and compliance. Primarily developed applications using Go and managed the API Gateway with OpenResty and Lua. Leveraged a tech stack based on HashiCorp tools, including Nomad, Consul, and Vault, for robust service orchestration and management. Deployed infrastructure on AWS using Infrastructure as Code (IaC) to achieve efficient, repeatable, and scalable deployments. Actively contributed to incident response, collaborating closely with the DevOps team to enhance system reliability and performance.

Tech Stack: Go, OpenResty, Lua, Nomad, Consul, Vault, AWS, Infrastructure as Code (IaC)

Led the migration from On-Premise and Oracle Cloud infrastructure to AWS, implementing a DevOps culture and transitioning from virtual machines to Linux containers using AWS ECS. Managed AWS accounts and designed network architecture to ensure secure, scalable, and efficient cloud operations.

Tech Stack: Docker, AWS, Oracle Cloud, ECS, Packer, Ansible, Terraform, Python

Successfully led the migration of a legacy Business Intelligence architecture to a modern data pipeline. Utilizing Pentaho Data Integration, I moved data from Oracle Database to AWS Redshift, ensuring efficient and scalable data management. Integrated third-party services to provide new business insights, significantly enhancing data-driven decision-making. Replaced Tableau with Metabase, empowering team members to interact with and analyze data more effectively. Conducted data analysis for fraud detection, money laundering, customer behavior, and other critical areas. Designed a robust Data Lake to support diverse data storage needs.

Tech Stack: Docker, Tableau, Oracle Database, Redshift, Jenkins, Pentaho Data Integration (Kettle), Python, Jupyter Notebooks, AWS Lambda, AWS EC2, AWS DocumentDB, RDS (Postgres), AWS API Gateway, Metabase

Developed web crawlers using Ruby, enabling efficient data extraction from various online sources. Created Python notebooks for analyzing diverse datasets, providing valuable business insights and data-driven decision-making. Provisioned Docker Jupyter Lab servers to facilitate collaborative work among team members. Experience in microservices architecture using API Gateway, Lambda, Cognito, and DynamoDB.

Tech Stack: Ruby, Python, Jupyter Notebooks, Docker, AWS Lambda, AWS API Gateway, AWS Cognito, DynamoDB, Web Scraping, Data Analysis

Developed and deployed microservices using Go and Java. Built robust WebApps with Node.js and React. Processed data pipelines with Spark on AWS EMR. Wrote efficient queries for both MongoDB and Cassandra. Designed and maintained Kibana dashboards for real-time data visualization. Deployed applications using Mesos/Marathon, utilizing Bamboo CI for continuous integration and delivery. Implemented New Relic for monitoring and performance analysis. Set up and managed development environments with Docker and Docker Compose.

Tech Stack: Go, Java, Node.js, React, Apache Spark, AWS EMR, MongoDB, Cassandra, Kibana, Mesos/Marathon, Bamboo CI, Docker, Docker Compose, New Relic

Extensive experience in Ruby on Rails development using JRuby. Wrote complex MySQL queries. Managed vSphere environments and administered Linux servers running CentOS and Ubuntu. Provisioned servers using Vagrant, Puppet, and Ansible on AWS and other platforms. Frontend development with jQuery, Backbone, Angular, and React. Developed Windows desktop applications using Python (with a focus on GUI development with Qt) and C++. Provisioned Selenium Grid with Docker for automated testing. Database management with MongoDB. Developed web applications using Node.js and Java. Built data extractors from various sources, including Google Analytics, Google Spreadsheets, Zendesk, SNMP, Twitter, and more. Implemented machine stats collectors using Go. Developed Ansible plugins with Python.

Tech Stack: Ruby on Rails, JRuby, MySQL, vSphere, Linux (CentOS, Ubuntu), Vagrant, Puppet, Ansible, AWS, jQuery, Backbone.js, Angular, React, Python, Qt, C++, Docker, Selenium Grid, MongoDB, Node.js, Java, Go, REST APIs

Extensive experience in Ruby on Rails development. Frontend development using jQuery and various plugins. Provisioned servers using Bash scripts on Linode. Proficient in writing complex MySQL queries and performing database backup and restore operations.

Tech Stack: Ruby on Rails, jQuery, MySQL, Bash, Linux, Linode, Web Development

Provided comprehensive support to developers working with APIs from PayPal, MoIP, and Buscapé. Wrote detailed and informative articles for the portal. Reviewed and edited articles to ensure accuracy, clarity, and consistency. Translation responsibilities.

Tech Stack: REST APIs, PayPal API, MoIP API, Buscapé API, Technical Documentation, Content Management

Configured and maintained both Ethernet and wireless networks. Configured and maintained various Linux services. Implemented and managed a Wiki using MediaWiki CMS. Developed and maintained websites using Drupal. MySQL database administration.

Tech Stack: Linux, Network Administration, MediaWiki, Drupal, MySQL, Web Server Administration

Extensive experience in multiplatform development using Python. Configured Oracle Grid Engine to optimize job scheduling and resource management in a high-performance computing environment. Strong background in digital image processing, utilizing Matlab. Configured and managed LDAP directories.

Tech Stack: Python, Oracle Grid Engine, Matlab, LDAP, High-Performance Computing, Digital Image Processing

Configured and managed Linux servers, including setting up and managing firewalls using Iptables, configuring network services such as Bind (DNS), DHCP, NIS, and NFS, and installing and managing web and proxy servers like Apache, Dansguardian, and Squid. Database administration with both MySQL and PostgreSQL. In-depth knowledge and hands-on experience with FreeBSD and OpenBSD servers. Utilized System Imager to efficiently clone machines. Managed and maintained Xen servers.

Tech Stack: Linux, FreeBSD, OpenBSD, Iptables, Bind (DNS), DHCP, NIS, NFS, Apache, Squid, Dansguardian, MySQL, PostgreSQL, System Imager, Xen Virtualization