🚀 From Zero to Hero: Dodging the Dark Side of Trading System Bugs (A Jedi’s Guide)
The Quest Begins (The "Why") Picture this: I’m hunched over three monitors at 2 a.m., coffee gone cold, staring at a chart that looks like a glitchy 8…
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We built a budgeting app that skips the bank login — here's the trade-off
Most budgeting apps open with the same onboarding step: connect your bank account. For a certain group of people, that's where the process ends — not …
The SEC EDGAR API: A Practical Guide to Free Filing Data in Python
The SEC EDGAR API is one of the best-kept secrets in financial data engineering: every mandatory disclosure filed by every U.S. public company, availa…
The 27-Day Runway Problem: Why Most Solopreneurs Are 4 Weeks From Closing (And the Forecasting Fix)
The 27-Day Runway Problem: Why Most Solopreneurs Are 4 Weeks From Closing (And the Forecasting Fix) You have 27 days. That's the median cash reserve f…
QuantConnect Review: Running 2,400 Backtests Without Installing a Single Python Library
Two years, 2,400+ backtests, and one accidentally profitable strategy — here's what actually happens when a developer tries to become a quant. I first…
Alpha Vantage vs Yahoo Finance API: Free Market Data for Side Projects — An Honest Comparison
Eight projects, 600,000 API calls, and one production outage on a Sunday night — here's what you actually get from the two most popular free financial…
Portfolio Rebalancing Tools for the Hands-On Investor
I have a spreadsheet that tells me exactly which positions are off-target by how many dollars. It took thirty minutes to build and it works — but I st…
Is it safe to connect my bank account to AI?
The honest version of this question has five answers — one per thing that could go wrong. "Is it safe?" by itself is not really answerable; "is this s…
SEC EDGAR for Developers: The Free Fundamentals API Hiding in Plain Sight
You finished the comparison shopping between Polygon and Alpha Vantage, maybe even signed up for a free tier of each. Now you want to pull fundamental…
We built a finance app that refuses to ask for your bank login
The problem with most expense trackers Most personal finance apps assume you'll hand over your bank credentials. The whole UX is designed around that …
I Built a Privacy-First Calculator Platform With Zero Tracking — Here's the Architecture
` Every financial calculator website I've used tracks you. Calculator.net, Omni Calculator, Mathway — they all collect your inputs, profile your behav…
One Open Source Project a Day (No. 59): Claude for Financial Services - Anthropic's Official AI Agent Suite for Finance
Introduction "From watching analysts work to managing the analytical pipeline itself." This is the 59th article in the "One Open Source Project a Day"…
Mitsui & Co. (TSE: 8031): First ¥1 Trillion Profit — And the Stock Is Down 10% From Its Peak
Record earnings. A 9% Berkshire stake. 9x forward earnings. The LNG and iron ore thesis — and the two risks that could break it. Mitsui & Co. did …
Mitsubishi Corporation (TSE: 8058): Why Buffett's Biggest Japanese Bet Keeps Getting Bigger
¥1.17 Trillion in annual profit. Japan's largest corporate buyback. A 9% Berkshire Hathaway stake. And yet the stock trades at 10 times earnings. Ther…