Summer Data Science Intern

We operate a subscription e-commerce site selling coffee, tea and brewing gear, shipped from our own warehouse. Sellers use the platform to list used outdoor gear, and we handle payments, shipping labels and buyer protection.

Overview

Our data team is small, three data scientists and one data engineer. The intern will work on one main project with a clear goal and a mentor. Our headquarters is in Stamford, and about a third of the team works remotely from other countries. Remote internship with a team based in Stamford. The stipend is paid at the end of each month. You will need at least 4 hours of overlap with US Eastern time. We talk mostly in Slack and hop on quick calls when something needs discussing.

What you'll do

Fine-tune small transformer models with Hugging Face for classification tasks. Evaluate models using precision, recall, AUC and other metrics that fit the problem. Label and review samples of training data to check quality. Package a trained model behind a simple FastAPI endpoint for testing. Clean and prepare datasets in Python using pandas and NumPy. Train baseline models with scikit-learn and compare them against simple rules.

Who can apply

Eligible to work in Slovakia. Based in Slovakia for the duration of the internship. Currently enrolled in a bachelor's or master's degree, graduating 2026 or 2027. Available for the full internship period. Clear written English, since most discussions happen in docs and Slack threads. Laptop with 8 GB RAM or more and a stable internet connection (no GPU needed, we provide cloud compute). Basic statistics: distributions, hypothesis testing, sampling.

What you get out of it

How to judge whether a model is worth deploying, not just whether its accuracy is high. Working with messy production data and real business constraints. You will take one model from raw data to an evaluated prototype. Weekly mentorship from a senior data scientist.

Duration: 3 months

Start date: Immediately

Stipend: €1,400-€1,900 per month

What we offer

Flexible hours. Paid public holidays. Internet allowance. Certificate of completion.

Please submit your CV in English.

Duration: 3 months. Start: Immediately.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Bellwether Labs LLC.