I built an hourly crypto "market thermometer" from free data, then refused to let it trade

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Most "AI sentiment trading" projects start by wiring a sentiment score straight into buy and sell decisions. I went through the published evidence first and ended up building the opposite: a sensor that records everything, decides nothing, and has to earn the right to influence a trade. This is the design, the code for each sensor, and the test each flag must pass. (The free lite backtester for this system, public API only, no key: GMO Coin Trend Lab, source on GitHub.) Social sentiment direction is mostly a same-day correlate, not a predictor. The famous 2011 "Twitter mood predicts the Dow" r

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When Your Own Server Becomes the Attacker

In March 2019, a former Amazon engineer made a request to a Capital One server. Not a login, not a password guess. She asked the server to fetch a URL for her. The server said yes. That one request walked out with temporary AWS credentials, and those credentials unlocked the personal data of more than 100 million people.

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ProgrammingDEV Community ·

I'm not a programmer. I ran cafes. Then I built an AI coworker that uses my PC without stealing my screen.

A year ago I was running small shops in Seoul - a cafe, a convenience store, food. I can't really code. But I kept watching AI "computer use" demos and thinking: this is amazing, and also I would never use it every day. The loop is always the same: take a screenshot, think, click, take another screenshot. Each step takes seconds.

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ProgrammingDEV Community ·

What breaks when you ship to ten locales at once

I localized a mobile app into ten languages. Most of what I'd read beforehand was about how to These are the mistakes I actually made. This is the one I'd undo first. The quiz content — the part users came for — got translated properly. The surrounding interface did The result is worse than an English-only app, because it sets an expectation and then breaks it.

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ProgrammingDEV Community ·

Designing for people reading in their second language

Most people using the products I work on are preparing for a US licensing exam in a language that isn't The thing I keep relearning: they are not bad at the test. The test is being delivered through a Every bit of that layer you remove goes straight into their score. Here is what I've learned about removing it. "Which of the following is not required when…" A fluent reader handles this without noticing. A second-language reader has to hold the entire option Official exam material is full of negation and you often can't change that — but everything around it Double negation — "which is not perm

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