About

Research-minded builder with a bias for clarity.

Constantin Ertel

Background

I'm a student at UC Berkeley working at the intersection of machine learning, analytics, and investing. I build systems that make hard problems tractable — from self-supervised vision experiments and generative model pipelines to Bayesian cost simulations and churn investigations on SaaS businesses.

Bio

This site collects equity research, project write-ups, and analytical work. I'm drawn to problems that require both quantitative rigor and clear communication — where the goal is to be precise about what you know and honest about what you don't. Outside of research and code, I follow markets with a long-horizon, durable-moat lens.

Recent research

Editorial stock workups built for patient readers.

Selected builds

Machine learning and analytics projects with production intent.

Fintech / AI Application Live product

Fincast

AI-assisted valuation workflows for public equities, with scenario modeling, fair value outputs, and live market context in one interface.

Next.jsAnthropic APIMarket dataValuation models
ML / Self-Supervised Learning Research build

JEPA Experiment

A research comparison of representation-learning objectives, testing whether JEPA-style prediction produces more useful embeddings than reconstruction.

PyTorchVision TransformerCIFAR-10Representation learning
ML / Generative AI Prototype

Personalized Listing Photo Editing

A compact personalization pipeline for learning a photographer-specific editing style without keeping a heavyweight generation model in production.

BLIP-2FLUX.1 KontextInstructPix2PixLoRA