Paulo Henrique de Souza Pigatto

Itaú is the biggest private bank of LATAM and has a huge legacy architecture based on mainframes. In their modernization effort, I worked on a product team organized in an SRE fashion, aiming to improve the core system responsible for booking loans. During this process, I led the solutions architecture meetings since my team members were not too versed in English. We worked closely with AWS architects and consultants to design a modern and sustainable solution that would account for future system demands and evolvability.

I was responsible for deploying most of the infrastructure using Terraform and CloudFormation, exposing the applications according to the bank's compliance and tools, and setting up observability using Splunk and AppDynamics.

Pocket had a legacy architecture based on EC2 instances to host Blockchain nodes that served as backups and could be queried to validate network response for security and integrity. I worked as a DevOps engineer in a team of four to keep all of this up, running, and patched. When we started adding more Blockchains to the platform, we realized this approach was not scalable, so we initiated a project to migrate everything to Kubernetes and chose GKE for that.

So we did the following:
• Built a GitHub Actions workflow to build and push updated images from blockchain clients automatically. (https://github.com/pokt-foundation/docker-images)
• Deployed three clusters in three different regions using GKE.
• Built a snapshotter application to stop blockchain containers, create a snapshot of the disk, and replicate it across regions
• Built a sidecar to check the blockchain node health and block height and availability. (https://github.com/pokt-foundation/chain-healthcheck-sidecar)
• Managed the blockchain nodes through ArgoCD.

A prototype based on the Stellar protocol. It was presented to the Brazilian Central Bank (BACEN) as a possible solution for the new instant payment ecosystem. After the LIFT program, BACEN decided to build their system, Pix, which is already well spread amongst Brazilian consumers.

I was responsible for:
• Creating Terraform stacks so we could scale the application to dozens of machines
• Writing Locust tasks and gathering results of the load tests
• Interpreting the results to help write the report
• Finding quick wins on the code and infrastructure to get better results

A loyalty program for Allergan products. I was one of the DevOps engineers working to ensure their promotional Botox Day was a success. It was possible through infrastructure as code (IaC), security improvements, load testing, capacity planning, and system optimizations, such as using read replicas. The Botox Day was indeed a success, achieving 530,000 unique visitors, more than 1,100 requests per second during peak, over 260 requests per second on average, and more than 30,000 Lambda concurrent executions.