# Ran Aroussi Ran Aroussi is a programmer, builder, and founder. He has been writing code since the late 1980s and starting companies since he was 17. Somewhere in between, he wrote software that tens of millions of people use every month. ## By the numbers - **30M+ downloads/month** across his open-source software - **50K+ GitHub stars** - **30K newsletter subscribers** - **92% client retention** at Automaze — in an industry where most agencies churn annually - Creator of **[yfinance](https://github.com/ranaroussi/yfinance)** and **[quantstats](https://github.com/ranaroussi/quantstats)** — the most widely used financial data libraries in Python --- ## What he's building Most of his time right now goes into two platforms he believes will change how software gets built and run: **[MUXI](https://muxi.org?ref=aroussi&utm_source=aroussi.com&utm_medium=website)** — open-source infrastructure for AI agents. Think Docker, but for agents. The missing layer between raw LLMs and production systems. **[Cloop](https://cloop.dev?ref=aroussi&utm_source=aroussi.com&utm_medium=website)** — an autonomous engineering control plane. It turns approved issues into pull requests, auto-detects and fixes bugs, and guards against supply-chain attacks. Your engineering team, minus the toil. Several other ventures are being built on top of these — quietly, for now. --- ## How he works with people **[Automaze](https://automaze.io?ref=aroussi&utm_source=aroussi.com&utm_medium=website)** is his CTO-as-a-Service agency. They embed with founders and technical teams who need senior engineering leadership without the overhead of a full-time hire. They've maintained a 92% client retention rate because they treat their clients' businesses like their own — because in some cases, they are. **[VarOps](https://varops.com)** is his systems-level advisory practice — for companies building with or on AI that need more than code. Strategy, architecture, capability building, and the kind of straight talk that saves you from expensive mistakes. --- ## Writing & speaking He wrote **[Production-Grade Agentic AI](https://productionaibook.com?ref=aroussi&utm_source=aroussi.com&utm_medium=website)** — a practical guide to building AI agent systems that actually hold up in the real world. He hosts **[Old School; New Tech](https://oldschoolnewtech.com?ref=aroussi&utm_source=aroussi.com&utm_medium=website)** — a podcast for business owners who've scaled with technology and systems without becoming a tech startup. He writes the [**Code Daddy newsletter**](/subscribe) — for developers, indie makers, and solo entrepreneurs looking to build smarter. 30,000 people read it. You're welcome to join them. He is also available for podcast appearances, conference talks, and workshops. You can find a full list of [past appearances and sessions here](/speaking). --- ## Beyond the code The technical work is only part of it. He has spent decades on the business side too — online marketing, performance advertising, and growth. He ran a performance marketing school in Israel that put over 5,000 students through its doors and made a lot of them genuinely wealthy. He led a multi-million dollar product launch in AdTech and spent years on both the buy and sell sides of online media exchanges. Then he built fully automated algorithmic trading strategies at the intersection of software and capital markets. All of which is to say: when he advises on technology, he's not just thinking about the code. --- ## The rest Based in London. Four kids. 35+ years of production code. He is mostly active on [X/Twitter](https://x.com/aroussi).