Jinwoo Je | Portfolio

This was exceptionally productive. The principle "It's easier to ask forgiveness than permission" continues proving effective. Action and speed win; iteration drives gains. While I consider myself action- oriented, there's room to push further. People have opinions on why something shouldn't be done, but once momentum builds, they rarely intervene.
With data infrastructure vended from DE/BI partners, I built a UPF MVP capable of generating end-to-end forecasts with plan artifacts in three weeks. After extensive whiteboarding, I built the MVP directly through AWS services (SageMaker, S3, Lambda) and internal ETL tools. I created PRIMA, a UPF-compatible zip -share forecast engine that outperforms accuracy criteria in both precision and execution time while maintaining end-to-end explainability. This MVP helped identify issues, iterate on data schema and logic, and provide direction to the Science team. It also enabled a workshop during our offsite to train forecast PMs on UPF.
I can now produce work that previously required teams of specialists—software developers, product managers, data engineers, and research scientists. This approach is faster because the feedback loop is instant.
I'm using Cursor for non-coding tasks with impressive results: writing documents, organizing files, drawing diagrams. Agentic features like tool calling remove friction from the human-LLM interface. Its ability to run commands ('ls', 'mkdir', 'touch', 'mv', 'rm') eliminates manual context copying and pasting.
I spent considerable time learning authentication and authorization solutions. This remains complex for those beginning to build software or SaaS products requiring proper user and access management.