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Work Background
KakeSenior Software Engineer
Feb. 2024- Designed and improved ticket management and Wallet Pass (Apple/Google Wallet) features, with a strong focus on layout, functionality, and user experience.
- Refactored legacy Wallet Pass generation flows, applying robust design patterns to improve maintainability, readability, and performance.
- Leveraged parallelism and concurrency in Rust to optimize API response times and reliably handle high-volume traffic.
- Performed performance testing and bottleneck analysis, implementing targeted fixes that enhanced scalability, stability, and reliability in production environments.
- Enhanced an internal CMS with advanced video/image management capabilities and integrated Auth0 M2M authentication to enable secure, automated service-to-service communication.
- Currently building a Tauri-based desktop application (Rust + React) for immersive experience content management, backed by Redis/MongoDB/PostgreSQL data pipelines.
- Contributed to **wallet-pass**, an open source Rust library for building and signing Apple Wallet passes (.pkpass), reinforcing production-grade expertise in Wallet Pass generation and signing flows.
GitHub: [https://github.com/pixix4/wallet-pass](https://github.com/pixix4/wallet-pass)
X-TeamSenior Software Engineer
Aug. 2021 - Nov. 2023Porto AlegreTreasure Financial: - Implemented features and fixed bugs for the business, collaborating with a team - Technologies: JavaScript, NodeJS, ReactJS, TypeScript, Express, HapiJS, TypeORM, PostgreSQL, Jest, Chai, Mocha, Swagger, Docker, Kubernetes, GCP - Worked on Treasure Cash, designing and implementing a component supporting APEX integration - Improved test coverage and refactored legacy codebase using Design Patterns and Clean Code principles - Implemented robust features for the core investments platform and optimized database performance - Successfully migrated services from NodeJS to Java using Spring Boot for improved performance and resource consumption Double Atelier: - Implemented a feature to track working time for executives and assistants - Technologies: JavaScript, NodeJS, ReactJS, TypeScript, PostgreSQL, GraphQL, Apollo, Jest, Chai, Mocha, AWS Fargate, AWS ECS, AWS Cloudwatch - Developed time tracking backend, preventing task overlapping using PostgreSQL's OVERLAPS function - Created GraphQL API for task management, utilizing the time tracking feature to prevent conflicts - Integrated Frontend app with Apollo for creating and updating tasks XHQ - Implemented new features, improved performance, and mentored team members - Technologies: JavaScript, NodeJS, ReactJS, TypeScript, PostgreSQL, Redis, HapiJS, Sequelize, Jest, Chai, Mocha, Swagger, AWS Lambda, AWS EC2, AWS codebuild, AWS SQS, AWS SNS, AWS S3, AWS Cloudwatch - Implemented a betting feature with Slack integration, allowing users to place bets using coins - Refactored anniversaries and birthdays reminder feature to work for multiple companies - Implemented change data capture for cache to keep data up-to-date and improve performance
Zup InnovationSenior Backend Engineer
Mar. 2021 - Nov. 2021Porto AlegreItaú:
- Implemented the Cashback engine to support other products in providing cash back on invoices.
- Worked on the Cashback service project, which successfully handled over 1M users and integrated with 3rd party services.
- Developed the Cashback Lambda project, utilizing worker threads in NodeJS to process large CSV files within 2 minutes, optimizing AWS Lambda costs.
- Collaborated with engineers from other teams to deliver the projects ahead of schedule.
- Acquired knowledge in AWS Lambda, AWS SNS, and Terraform during the project development.
SensediaSenior Backend Engineer
Aug. 2019 - Mar. 2021Porto AlegrePagoNxt (Onboarding): - Implemented REST APIs and services using JavaScript and NodeJS. - Contributed to the architecture design, implementing microservices and using technologies such as Docker, Kubernetes, Azure ServiceBus and Azure Repos. - Developed features such as orchestrating calls to other microservices and implementing a generic publisher using design patterns. - Worked on a QueryBuilder to reduce errors in queries for databases with queries in MongoDB - Focus on improving code quality, integration with third-party systems and handling integration failures using Azure ServiceBus.
GetNet Brasil (Recurring Payment): - Was responsible for training and mentoring NodeJS developers to work with Java. - Implemented features for recurring payments using Java 8, Spring Boot, and MongoDB. - Mentored two NodeJS developers to code in Java and complete a REST API project. - Improved the existing payment engine and implemented logic to trigger the payment process based on specific scenarios. - Collaborated with another senior developer to enhance the overall code.
PagoNxt (Recurring Payment): - Expanded my role to mentor junior developers and help them implement the recurring payment feature. - Focused on improving code quality through code reviews, pair programming, and knowledge sharing with junior developers. - Collaborated with another senior developer to enhance the overall code.
PUC-RSFull Stack Software Engineer
Jan. 2019 - Jul. 2019Porto Alegre- Implemented a web service for a class timetable simulator, capable of handling 100+ simultaneous users
- Utilized Java 8, Spring Boot, Spring Framework, and Oracle for the backend development
- Employed JavaScript, TypeScript, Angular 11, and RxJS for the frontend development
- Leveraged Docker, on-premise servers, and Traeffic for infrastructure management
- Implemented CI/CD pipeline using Jenkins
- Collected data from existing databases using DBezium as Change Data Capture
- Developed a simulation API with REST endpoints to support the simulation process
- Used brute force simulation logic to spread professors' classes in the timetable
- Achieved a simulation runtime of 5 minutes, meeting the stakeholder's requirements
- Stored simulations and results in an Oracle database
- Moved on to work on a project serving multiple countries before the completion and deployment of the project to production
IlegraFull Stack Software Engineer
Mar. 2018 - Dec. 2018Porto AlegreAgibank:
- Worked as a frontend engineer on the white label card issuance project at Ilegra, contributing to the development and maintenance of card-related functionalities.
- Designed and implemented various features, including requesting a new batch of cards, canceling a batch request, returning an invalid batch, and implementing authorization using cookies.
- Collaborated with a multidisciplinary team, including backend developers, testers, and stakeholders, to ensure successful project outcomes.
- Developed a script in Ruby to cancel batches upon user request, leveraging the expertise of the Tech Lead.
- Played a key role in the payment centralizer project, defining the architecture of the payment centralizer service and mentoring a junior developer through pair programming and one-on-one sessions.
- Utilized technologies such as Java 8, Ruby, Spring Boot, Spring Framework, Angular 2+, RxJS, Docker, Kubernetes, RabbitMQ, GitLab, Jenkins, and the ELK stack (Elasticsearch, Logstash, Kibana).
- Successfully improved the efficiency of the card issuance process, enhanced the user experience, and effectively tracked payment lifecycles for each product.
- Demonstrated adaptability by quickly learning Angular 2+ after initially preparing to work with Angular v1.
- Overcame challenges such as tight deadlines, learning new technologies, and integrating with third-party systems.
- Fostered teamwork and knowledge sharing through mentorship and pair programming sessions.
- Effectively resolved conflicts by switching roles and understanding the perspectives of other team members.
- Learned how to provide constructive feedback to a junior developer, guided by the Tech Lead.
- Dedicated additional time outside of work to study and improve skills related to the project.
- Proud of successfully handling the challenges of learning a new technology, understanding a new business, and working with microservices simultaneously.
ZenviaIntern
Oct. 2014 - Mar. 2016- Responsible for configuring integration between telephone operators and VAS (Value Added Service) service providers on the Zenvia platform.
- Responsible for carrying out tests of the integrations configured on the platform, collecting evidence that each scenario is working as expected.
- Responsible for generating documentation containing evidence and description of how each scenario was tested.
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