Stephan Hernandez

Go CLI tool for tsnet-based Tailscale node registration — programmatically brings a machine onto a tailnet without the standard Tailscale client. Includes a full README and Vagrant-based integration tests, with a written discussion of the Linux capabilities involved.

Flutter mobile app that scans QR codes and barcodes, then checks the decoded URL against the Google Safe Browsing API to flag it as Safe or Suspicious before the user opens it. Built for a mobile development course, with the Safe Browsing integration validated via mocked and live network tests, and camera capture tested on a physical device.

Machine learning component of a team project on Big Data in banking and insurance: a customer churn prediction model and a collaborative-filtering recommendation system, built as part of a 3-day academic exercise alongside a separate pipeline and API layer built by teammates.

Scoring service for a 4-hour RAG mini-hackathon at ENI Fianarantsoa. Judges participants' RAG-generated answers against expected ones via embedding cosine similarity, classifies each into pass/gray/fail zones, and serves a live leaderboard through a FastAPI service — the engine only scores answers, it never generates any.