New York University · Class of 2028

SebastianCapellan

Sebastian Capellan
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About

Who I Am

Sebastian Capellan

I'm a third-year student at NYU pursuing a joint degree in Computer Science and Data Science, with a deep orientation toward software engineering and systems programming.

My interests span data engineering & science, low-level systems, mathematics, and the intersection of software with real-world impact. I'm drawn to infrastructure that other engineers build on top of and work with daily.

Outside of software, I'm a hobbyist music producer, a fitness enthusiast, a chess player, and someone with long-term interest in philanthropy and public policy.

Python C Java TypeScript HTML CSS SQL
2+
Years Academic CS
5+
Years Hobbyist Dev
3
Industry & Research Experiences
OSS
Open Source Contributor

What I've Done

Summer 2026
Duolingo
Software Engineer Intern (Incoming)

Incoming intern in Duolingo's SWE Thrive program, Summer 2026.

TBD
Oct 2025 – Apr 2026
UCSF
Research Assistant

Built a queryable polymer database for materials science research at the University of California, San Francisco. Architected a full database migration from JSON/CSV to SQLite with ETL pipelining in Python, and Next.js API routes, implementing a TypeScript seeder and singleton DB connection pattern for significant query performance gains.

Python SQL TypeScript
Jun – Jul 2025
Carabiner Consultancy
Software Developer

Built the landing page for the firm's website using HTML & CSS fundamentals combined with a Next.js architecture.

HTML CSS

Projects

What I've Built

Backtesting Engine

Quantitative Backtesting Engine + Paper Trader

A Python & DuckDB based backtesting engine for evaluating and autonomously executing trading strategies with comprehensive analytics and visualization.

KV Store

Multithreaded Key-Value Store

A concurrent key-value store written in C, demonstrating low-level memory management, thread safety, and systems programming depth.

LeetRefresh

Algorithmic Programming Study Tool

Website that parses user LeetCode JSON files in order to allow review of completed questions as well as random assignment of new ones.

Fractal Visualiser

Mandelbrot Fractal Visualiser

A fractal visualization software created using Python and Matplotlib for rendering, and Numba JIT compilation for speedup. Hosted on Streamlit.

Contact

Let's Talk

I'm always open to conversations about engineering, research, internships, and anything about tech as a whole. Reach out if you are looking for a chat.

Closed for Summer 2026 opportunities