🚀 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…
Build a Real-Time Stock Signal Scanner in Python (No Bloomberg Terminal Required)
Most retail traders look at one indicator at a time. Professional quant desks look for confluence - multiple signals firing on the same ticker at the …
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…
Why I Stopped Ignoring Position Size (and What It Taught Me About Stops)
Why I Stopped Ignoring Position Size (and What It Taught Me About Stops) Quick context (why you're writing this) Here's the thing: I spent a whole wee…
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…
How to Brier-grade your own ML option-pricing forecasts in 40 lines of Python
If you ship a probabilistic forecast, the single highest-value habit you can build is logging your forecasts so you can grade them later . Sabermetric…
The Math Behind Retiring at 40 as a Software Engineer (FIRE)
Software engineering is one of the few professions where achieving Financial Independence and Retiring Early (FIRE) isn't just a pipe dream—it's highl…
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…
Why Your Backtest Is Lying to You: Data Biases That Ruin Equity Research
You built a backtest. It returns 18% annualized over the last decade. The Sharpe is 1.4. The drawdown is acceptable. You're already mentally apartment…
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…
[05] When to Pull the Trigger on FIRE — Monte Carlo Says You're Already Free
[05] When to Pull the Trigger on FIRE — Monte Carlo Says You're Already Free This is Part 5 of a 6-part series: Building Investment Systems with Pytho…
[04] The 90/10 Portfolio — Dividend Core + Growth Satellite with a Live Simulator
[04] The 90/10 Portfolio — Dividend Core + Growth Satellite with a Live Simulator This is Part 4 of a 6-part series: Building Investment Systems with …
[03] Designing a Personal Commitment Line — Two Loans, One Defense System
[03] Designing a Personal Commitment Line — Two Loans, One Defense System This is Part 3 of a 6-part series: Building Investment Systems with Python T…
[02] Stress Testing Your Life — What Happens at -30%, -50%, -60%?
[02] Stress Testing Your Life — What Happens at -30%, -50%, -60%? This is Part 2 of a 6-part series: Building Investment Systems with Python Banks Do …