DEV Community: Henrique Proença The latest articles on DEV Community by Henrique Proença (@financebro). https://dev.to/financebro https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4107892%2F45c4fdeb-1fc9-481a-945c-0ebe5800dc5c.jpg DEV Community: Henrique Proença https://dev.to/financebro en I Built Finance Lab: A Portfolio Analytics and Paper-Trading App with Python Henrique Proença Thu, 03 Sep 2026 14:36:24 +0000 https://dev.to/financebro/i-built-finance-lab-a-portfolio-analytics-and-paper-trading-app-with-python-4on7 https://dev.to/financebro/i-built-finance-lab-a-portfolio-analytics-and-paper-trading-app-with-python-4on7 <p>Hi DEV Community!</p> <p>I’m Henrique, a Master’s student in Finance at ISEG. I wanted to turn some of the financial concepts I was studying into something practical, so I built <strong>Finance Lab</strong> — a free web application for portfolio analysis, stock research and paper trading.</p> <h2> What can you do with Finance Lab? </h2> <ul> <li>Research stocks and explore financial statements</li> <li>Create and manage simulated investment portfolios</li> <li>Follow live market prices and watchlists</li> <li>Analyse return, volatility and Sharpe ratio</li> <li>Calculate Value at Risk and Expected Shortfall</li> <li>Study drawdowns, diversification and stress scenarios</li> <li>Export professional Excel reports</li> <li>Create a private account and keep portfolio data between sessions</li> </ul> <h2> Technology </h2> <p>Finance Lab was built using:</p> <ul> <li>Python</li> <li>Streamlit</li> <li>Pandas and NumPy</li> <li>Plotly</li> <li>yfinance</li> <li>Supabase</li> <li>GitHub and Streamlit Community Cloud</li> </ul> <h2> Try the application </h2> <p><a href="https://finance-bro-lab.streamlit.app" rel="noopener noreferrer">Open Finance Lab</a></p> <p>Finance Lab is an educational project and does not provide financial advice.</p> <p>I would really appreciate honest feedback about the interface, usability and financial analysis features. What would you improve or add next?</p> python streamlit fintech webdev