Stone Co - Software Engineer
Full-time
Jul 2022 - Present
Achievements
- Enabled 10% upsell conversion by replicating and exposing AI-based recommendations via internal APIs integrated with customer service tools.
- Achieved 90% test coverage in the MVP of Pagar.me’s support platform backend, enabling faster and safer iterations from day one.
- Reduced maintenance overhead and improved code reuse by introducing a monorepo structure across backend services.
Context
Stone is a Brazilian fintech company that provides payment and financial solutions to businesses of all sizes. As I advanced within the company, I assumed greater responsibility for backend architecture, code quality, and developer experience. I led system deliveries, proposed structural improvements, and became a trusted advisor on technical decisions, balancing business goals with engineering excellence.
Technologies
- Nodejs / Nestjs / Fastify / Golang / Python / React
- Testing (unit / integration / e2e)
- Microservices / Clean Architecture / SOLID / Design Patterns
- Docker / Docker Compose / Kubernetes
- CI/CD / Github Actions / ArgoCD
- Postgres / MongoDB / Redis / AWS SQS
- AWS / Azure
Stone Co - Junior Software Engineer
Full-time
Jul 2021 - Jul 2022
Achievements
- Accelerated test execution by 3x by replacing ts-jest with @swc/jest, improving dev feedback loop and CI speed.
- Reduced manual effort in 30x by migrating a spreadsheet-based workflow to a web application
- Improved code maintainability and team productivity by advocating for and helping implement NestJS as the backend framework.
Context
As a backend engineer on one of Stone’s internal tools team, I developed features and services that empowered the customer service operation. I improved workflow automation, integrated systems, and contributed to backend architecture across multiple internal products.
Technologies
- Nodejs / Nestjs / Python / React
- Testing (unit / integration / e2e)
- Docker / Docker Compose
- CI/CD / Github Actions / Azure DevOps
- Postgres / Redis
- AWS / Azure
MVNO CRM - Software Engineer
Freelance
Mar 2020 - Nov 2021
Achievements
- Accelerated customer support workflows in 5x by replacing error-prone Postman-based processes with a web application.
- Reduced lead time for changes in 20x by scripting a selective deployment process over SSH, streamlining manual releases in a non-CI environment.
- Enabled data-driven decision-making by delivering 5+ custom reports used weekly by support, finance, and leadership teams to prevent losses, detect abusive usage, and guide strategic actions.
Context
Developed a web application for a telecom operator to manage client lines, contracts, and usage reporting. Prior to this system, key operations like line activation and portability were handled manually, prone to mistakes and inefficiencies. The new platform automated these tasks and consolidated data in one place, improving both service control and internal execution.
Technologies
- Nestjs / Nodejs
- Angular
- MariaDB
- Docker
- Nginx as reverse proxy
ISPGuardian - Fullstack Engineer
Freelance
Sep 2020 - Jun 2021
Achievements
- Monitored dozens of devices by building an uptime tracking system with data visualized in Chart.js dashboards.
- Engineered a lightweight monitoring prototype under tight resource limits, balancing SNMP polling with scalable frontend updates.
- Handled logging and auditing by writing structured error logs to a database and console, ensuring traceability despite MVP constraints.
Context
Developed an MVP monitoring system for a data center client, focusing on visualizing uptime of core services. Though the project was later discontinued due to financial constraints, it provided a foundation for structured observability and reduced reliance on fragmented status tracking tools.
Technologies
- Nestjs / NodeJs
- Angular
- MariaDB
- Docker
- Nginx as reverse proxy
IMAP - Junior Software Engineer
Full-time
Jul 2020 - Jun 2021
Achievements
- Closed 2 new contracts by developing a web scraper that retrieved municipal data from competitor systems, enabling secure and informed supplier transitions.
- Reduced manual effort and improved assessment tracking for thousands of students and teachers by implementing a remote test module with auto-grading and digital submission.
- Reached tens of thousands of citizens by developing a public COVID-19 dashboard for municipalities, increasing access to health data during the pandemic.
Context
IMAP is a Brazilian software company that provides digital solutions to improve public management and government transparency. As a junior software engineer, I helped develop core modules of SAI, the company’s flagship platform. During the pandemic, I collaborated with a fast-paced team to deliver critical features, such as a public health data dashboard and a remote test registration system, supporting municipalities in adapting to urgent demands.
Technologies
- .NET Framework / .NET Core / ASP.NET MVC / Nodejs / Javascript / HTML / CSS
- MS SQL
- JQuery/Bootstrap
IMAP - IT Intern
Full-time
Nov 2018 - Jul 2020
Achievements
- Supported a platform used by 70%+ of Bahia’s municipalities, contributing to public transparency in government spending.
- Improved overall system performance in 5x by optimizing stored procedures and indexing key columns in a multi-tenant system.
- Delivered small features and bug fixes across frontend and backend while gaining first real-world experience in production systems.
Context
Developed an MVP monitoring system for a data center client, focusing on visualizing uptime of core services. Though the project was later discontinued due to financial constraints, it provided a foundation for structured observability and reduced reliance on fragmented status tracking tools.
Technologies
- .NET Framework / .NET Core / ASP.NET MVC / Nodejs / Javascript / HTML / CSS
- MS SQL
- JQuery/Bootstrap