Mauricio Klein

I led the technical team that integrated Emirates with Blacklane and improved the system from an MVP design with manual steps to an automated product that collects information from flights and passengers provided by Emirates and schedules rides with Blacklane chauffeurs.

I held regular meetings with the Emirates team to collect feedback and enhance the system, maximizing the chauffeur schedule and ensuring all Emirates customers had a car waiting for them at the airport gate.

After a successful initial beta program, Emirates awarded additional cities with Blacklane integration.

Jura Online is a German e-learning company that prepares law students for their final exams.
I worked on migrating the Jura Online website and the back-end system.

The project was conducted on two fronts:
1. back-end migration
Migrated the monolith Java application into a microservice architecture powered by Ruby and Sinatra, collaborating with the company's CTO.

2. front-end migration
Migrated the front-end application with written templates in Scala, in a React application, using Redux as a store manager, and deployed on Amazon S3 served by Amazon CloudFront. I lead the front-end migration, managing two other engineers in the same project.

The sandbox environment for PagSeguro is part of Universo Online (UOL group), one of Brazilian's main digital payment services.

Mauricio worked on migrating functionalities of the "real" API into the Sandbox, allowing customers to test their integrations in a sane environment before making it available in production.

The project was implemented in Java with Enterprise Java Bean (EJB) and Java Message Service (JMS) and running on JBoss.

Jet5 was a small Brazilian startup focused on the delivery market by motorcycles.

The system was responsible for matching users requesting delivery of documents and small packages with motorcyclists willing to perform the job.

As a co-founder and lead back-end developer, my responsibility was to create the first PoC of the system. This PoC was built on Ruby on Rails, with Postgres as data storage. GeoLoc was part of the system, storing in the database the geolocation for pickup and dropoff of the package and calculating the price for the service.

Finally, push notifications were sent to drivers in the area nearby the pickup location, prospecting the jobs.

Worked for over a year as an automation consultant, helping companies and individuals automate repetitive processes, making their teams more efficient.

Among the projects I can disclose, there was:
1. Migration of thousands of Confluence pages to Notion, which was achieved with a mix of a Make (former Integromat) scenario and Notion API requests to transform and migrate data.
2. Automating invoice generation, processing records in an Excel sheet, and generating invoices and notifications automatically for the concerned parts.
3. Multiple personal automation, from setting reminders to personal workflow automation, including integrations with Google Drive, ChatGPT, and external APIs, among others.

I worked for one year on various projects for Trantor, an Italian-based company in the IT services space.

My duties included, but weren't limited to:

• Development and maintenance of back-end applications in Node.js (using TypeScript)
• Development of front-end applications in React (using TypeScript)
• Development of middleware application for communication with Windows API in Rust
• Existing project improvements in the building and testing phase, using the incremental building with Turborepo, Docker, and GitHub Actions as CI/CD

Tech stack: JavaScript, TypeScript, Node.js, Rust, React, Docker, GitHub Actions, Turborepo, PostgreSQL

As a member of the Amazon Web Services (AWS) team for three years, I contributed to Amazon CodeCatalyst in a full-stack role, handling the back end, front end, and infrastructure.

BACK-END DEVELOPMENT
• I developed a serverless application using Node.js, AWS Lambda, API Gateway, DynamoDB, and ECS. I optimized DynamoDB schemas to support evolving business needs, ensuring scalability and efficient data access.

FRONT-END DEVELOPMENT:
• I built the UI for the DevEnvironment feature from scratch using React, creating an intuitive interface tailored for developers.

INFRASTRUCTURE MANAGEMENT
• I managed infrastructure with AWS Cloud Development Kit (CDK) and AWS CloudFormation, automating deployments and maintaining scalable environments. I implemented monitoring and logging solutions with Amazon CloudWatch to ensure reliability.

COLLABORATION
• I assisted a sister team in creating their infrastructure using AWS CDK, which included Lambda, API Gateway, DynamoDB, ECS, and ELB services.

KEY ACHIEVEMENTS
• Developed the DevEnvironment UI from scratch.
• Led the infrastructure setup for a sister team using AWS CDK.
• Improved Amazon DynamoDB schema design for new business requirements.

While working on fromAtoB as the tech lead for the integrations team, I proposed and implemented a solution to integrate providers with no public API exposed by using ethical web scrapping. The system was a Python Flask API, which, upon request, dispatched a web scrapper implemented using Beautiful Soup that would connect to the provider's website and collect all the available fares according to the user's filters. These results were then both returned to the API caller and stored internally in a cache so we could reduce the load on the provider's website. This allowed us to integrate 11 new providers in one month, which was a record at the company at that time.

I worked on the initial setup and first iteration of a new Q&A social platform (under NDA). I led the development of the web app (Next.js) and set up infrastructure and authentication in the cloud, with support for federated logins.