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We graded 13 famous trading strategies on 6 years of data. All 13 failed.

( https://tessen.ai/strategies ) Every trading book, YouTube channel, and Discord server teaches the same classics: RSI mean-reversion, the golden cro…

Berkshire's $397 Billion Bet Against an Overheated Market!

The Mechanics of Capital Preservation: Analyzing Berkshire Hathaway’s Liquidity Strategy The recent disclosure that Berkshire Hathaway has accrued a c…

BDE Score™: Open-Source Multi-Factor Stock Analysis Tool Covering US, HK & A-Share Markets

BDE Score™ — Open-Source Multi-Factor Stock Analysis One number. 0-100. Every stock. A composite score combining 5 dimensions: Momentum (30%), Volatil…

From Raw Prices to Real Signals: Financial Metrics for a Data Pipeline (Daily Return, MA, RSI, MACD, Volatility)

In this article I will share my understanding and use of some financial metrics used in my Financial Dashboard project. You can see it in this link an…

Funding open-source software without compromising it

How to Build a Point-in-Time Fundamentals Database from SEC EDGAR (and When Not To)

If you backtest with today's fundamentals, you are cheating yourself. The Revenue figure you pull for Q4 2019 was probably restated in 2021, and the r…

Credit risk is more than predicting default: building the full stack in Python (IFRS 9 ECL, scorecards, monitoring)

Most credit-risk tutorials stop at "train a classifier to predict default." That is maybe a fifth of what a real credit-risk function does, and not th…

The SEC has a free financial data API that nobody talks about

Every quarterly earnings number for every US public company going back to 2009 is sitting in a free, well-documented JSON API run by the US government…

Rebalancing a portfolio with only your next deposit (no selling)

Part of a series on building Balance , a portfolio rebalancing app for BR/US/Crypto investors, as a solo developer. Code in this article is simplified…

Building a Stock Market Trading Bot in Python: My Neo Moment

The Quest Begins (The "Why") Honestly, I was tired of watching my portfolio fluctuate while I stared at candlestick charts like they were hieroglyphic…

Stock Screener Automation: How a Trader Replaced ₹47K/Month Advisory with a Python Script

₹47,000 every month. That's what my friend Rohit was paying a fund advisory service to tell him which stocks matched his criteria. Six filters — RSI b…

Build Financial Analysis into Your Hermes AI Agent with the FMP Skill

Build Financial Analysis into Your Hermes AI Agent with the FMP Skill The Problem Building AI agents that can answer real-time financial questions is …

The Botfather: Building Your First Crypto Trading Bot

The Quest Begins (The "Why") Honestly, I was tired of staring at charts at 2 a.m., trying to catch that perfect entry while my coffee went cold. I’d s…

The CFO's AI Playbook: 5 Finance Automations Every Indian Business Should Run in 2026

Over 60% of APAC finance leaders say AI-led automation is their top priority for 2026. For Indian businesses, that stat hides a quieter truth: most SM…

Embed a Historical Exchange Rate Widget in Any Blog or Dashboard

Finance blogs, spreadsheet templates, travel-money pages, and internal dashboards often need a small historical exchange rate lookup without building …

Backtesting Trading Strategies: From Theory to Execution – My Quest for the Holy Grail of Profit

The Quest Begins (The "Why") Picture this: I’m sitting at my desk, coffee gone cold, staring at a spreadsheet that looks like something out of Indiana…

Making Ticker-tape for the Knicks Parade

📈 The Jedi’s Guide to Building a Python Stock‑Market Trading Bot

(or: How I Turned My Laptop Into a Lightsaber for the Market) The Quest Begins (The “Why”) Ever stared at a blinking cursor at 2 a.m., wishing you cou…

The stock-analysis API you don't have to build

I was building a feature that needed to say something useful about a stock — not just print its P/E, but actually read the situation: is this cheap or…

The `epsActual` That Wasn't: 15% of an LLM Backtest's Trades Were Decided on Data That Didn't Exist Yet

We were backtesting an LLM-driven earnings signal against a field called epsActual — the kind of field everyone treats as ground truth. It isn't. Abou…

🚀 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…

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…

Meet the new Sovereign Tech Fellows

PAYME Invoice Automator - The fastest way to generate professional PDF invoices.

Hey everyone! I built PAYME Invoice Automator out of sheer frustration. Every time I finished a small project, I dreaded the invoicing part. I'd eithe…

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…