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ExternalSoftware Engineering
DEV Community

How I Built a Python Backtesting Engine with 623 Tests

I spent the last year building a backtesting and live trading engine in Python. It started as a personal tool — I was tired of rewriting the same plumbing every time I wanted to test a strategy. Here's how it turned into a real product. Every time I wanted to backtest a trading strategy, I ended up writing the same boilerplate: Pull OHLCV data from somewhere Wire up indicators Write entry/exit logic Track positions, P&L, drawdowns Build some kind of report Hope nothing broke when I changed one t

pythonshowdevsoftware
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ExternalSoftware Engineering
DEV Community

How I added hard spending limits to AI agents (and why logging isn't enough)

If you've built an AI agent that calls paid APIs, you've probably I wanted something harder: a policy that blocks the agent before LangChain callbacks, OpenAI traces, CrewAI logs — they're all Even interrupt-based approaches like HumanInTheLoopMiddleware Treat budget as a tool the agent calls before any paid operation: python @function_tool def check_spend(amount: float, category: str = None) -> str: """ Check whether a planned spend is within budget. Returns 'approved' or 'deni

aipythonagents
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ExternalSoftware Engineering
DEV Community

Introducing React Motion Gallery

React Motion Gallery is a collection of primitives for complex layouts, modals, pointer/touch events, motion and data patterns – a library engineered around two principles: fluid animations and zero layout shift. It all began in the year 2022 with my first side project, an e-commerce template for Next.js. I noticed the bar was set extremely low in terms of UX for e-com sites, even the most profitable ones. So, I took it upon myself to change that, and give developers the tools to make sites fast

reactwebdevjavascript
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ExternalSoftware Engineering
DEV Community

Automating Myself Away… Almost

Automating Myself Away… Almost Hey, it’s the AI era, and I could not help but test the theory. And yes, I automated myself away. Well, not exactly. But almost. It has actually been fun to see how far this can go, and how it might look in the end. Of course, none of this goes anywhere near production systems without proper review, and it definitely does not replace these personal blogs I write myself. I still believe the human is very much important. I have kind of embraced it. AI is fully help

aiautomationdiscuss
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ExternalSoftware Engineering
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What is AI? You Are Already Using It - You Just Did Not Know

Pipeline & Prompts | Byte size guides on DevOps, Cloud and AI A decade ago I was selling predictive and prescriptive analytics solutions to enterprise clients. Tools like SPSS Modeler — IBM’s data science platform for predicting future outcomes — and CPLEX, the optimisation engine we talked about in Article 6, which solved complex scheduling and logistics problems for supply chain and warehouse operations. Back then AI was not a word that appeared in everyday conversation. It lived in university

devopsbeginnersgenerative
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ExternalTechnology Trends
The Verge Tech

Apple is using AI to fix Safari’s extension problem

Apple is trying to solve one of Safari's biggest weaknesses with AI. Safari has long lacked the robust library of extensions that its rivals have, mainly due to the stringent development requirements from Apple. But now, Apple is inviting users to essentially vibe-code their own extensions. In a demo shared by Apple, the company showed how you can ask Safari to create an extension by describing it. "Save and track cooking recipes from around the web," the prompt said. "Click the toolbar button t

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