Doug de Jesus

Software Engineer

Implemented a delayed payment trial model. Reworked data models, access control, and subscription lifecycle management. Integrated with third-party payment systems.
Transformed the course catalog from a static list to a dynamic, tag-based system with sorting and filtering. Used caching for fast performance and scalability.
Created a machine learning-driven recommendation service from scratch, which determines the most relevant courses for a user based on their engagement pattern.
Enabled virtual reality support for the learning environment and assisted with curriculum development for the first VR course, "Learn A-Frame".

Built systems, tools, automation, and machine learning to defend against spam and abuse.
Automated the deployment of weekly retrained ML models to reduce manual effort.
Implemented a graph embedding covering >1 billion users that was used to improve training data quality, extract new features, and increase classifier recall.
Improved efficiency and accuracy of abuse investigations by developing review tools that are used regularly by >900 Facebook employees.
Helped mitigate a security breach affecting 50 million users.
Improved incident response time by 90% by adding anomaly detection around reports.

Developed enterprise software for royalties accounting and IP management.
Led development of a data import service that processes >100k sales transactions at a time.
Refactored extensive legacy codebase to improve reusability, readability and stability.
Improved software efficiency, reducing runtime of certain processes from hours to seconds.