Bernard Lambeau, with the help of Anthropic's Claude Code AI, created the Elo programming language, an expression language compiling to JavaScript, Ruby, and SQL. The project, including a parser, compilers, and documentation, was completed in collaboration over a single day. The project demonstrates the potential of human-AI collaboration in software development, with the AI assisting in code generation and the developer providing oversight and methodology. Elo aims to provide a portable way to handle tasks like form validation and e-commerce processing.
Bernard Lambeau, a Belgium-based software developer and founder of several technology companies, created a programming language called Elo with the help of Anthropic's Claude Code . Starting on December 25, 2025, he published a series of posts about the project.
The first post names Claude as a co-author. "In roughly 24 hours of collaboration, we built a complete expression language with a parser, type system, three compilers, a standard library, a CLI tool, and a documentation website. Not bad for a day's work,” Lambeau and Claudeisn't just a demonstration that AI can write code. It's a demonstration that humans and AI can build together – each contributing what they do best,” they added. As an expression language that compiles to JavaScript, Ruby, and SQL, Elo is intended as a portable way to handle form validation, e-commerce order processing, and subscription logic.Claude users generally acknowledge that their pair partner makes mistakes. But those committed to AI assistance find it worthwhile to clean up after their helper. "Claude Code knows almost every tech stack , knows the Linux commands that matter , and does that 10x faster than I can do myself," Lambeau told"I was already a full-stack developer ; I'm now a full-stack++ dev because I can also use languages, frameworks, and reusable libraries I barely know, if at all," he explained. "Claude Code falls short if you don't have a great methodology. It needs feedback loops to work fine; otherwise, it derails. One possible feedback loop is a human reviewing code and testing manually. But there's a better/complementary approach if you want it to work autonomously. On both Elo and Bmg.js, I've started by making sure the testing methodology was effective and scientifically sound. Claude writes the tests, executes them, discovers where it's wrong, and corrects itself. Impressive.""But if I read the tests, agree with them, and can check myself that they run fine, I'm 95 percent sure it's already correct as a black box ," he explained."Then I can check the architecture and code quality as a white box by having a general look at the code, but I don't have to understand every detail.""I started in a setting where Claude Code asked for permissions every 20 seconds and I was checking everything it did," Lambeau explained."After a few successes, I quickly set up safe environments to be able to let Claude Code run in full autonomy .""I review the plan, make sure we have a test strategy that's sound, then switch Claude to autonomous mode and look at the tests, code & results afterward," he said."That's very similar to a lead-dev/CTO + QA role, btw; it's just much faster than with human devs." Lambeau, who has a PhD in software engineering and 30 years of experience as a developer, said both experts and novices can benefit from Claude Code, though he added that a service like"Now, when it comes to real software/product engineering, I think Claude Code requires experts ," he said."You still need to guide it a lot to keep the quality high enough. You need very strong expertise to do it effectively. Currently , if you don't have the expertise, you certainly end up with a big mess of unmaintainable code." Many developers have said as much about AI tools. They're more useful as an amplifier of expertise than as a replacement for it. The situation is analogous to the introduction of sequencing software, digital synthesizers, and drum machines half a century ago. These tools enabled a lot of people who weren't great musicians to make music. But they didn't instill musical skill, and they produced the most interesting work in the hands of practiced musicians. The cost to do this, Lambeau said, has been a Claude Max subscription that he purchased in December for €180 a month. In that time, he says, he wrote Elo ," he said."Mainstream programming languages are very complex, error-prone, sometimes dangerous, and the programs are difficult to review for non-experts." "More importantly, they are cumbersome to use for even simple data tasks. I mean, even validating the schema and constraints of a data file at runtime tends to be a nightmare in existing languages. It's not built-in in any mainstream language; you immediately need validation libraries; most of them are limited in what they can easily check, so you need to add dedicated boilerplate code." In a world where non-technical people will have the opportunity to write untrustworthy code with the help of AI, he said, we need to be able to run that code safely. "Elo aims at providing a safe & simple alternative," he said."It will be a limited language but super safe & simple, and usable in 80 percent of common data use cases. The very first no-code tool to integrate it will be Klaro Cards, of course." ®Data thieves borrow Nike's 'Just Do It' mantra, claim they ran off with 1.4TBMoscow likely behind wiper attack on Poland’s power grid, experts sayOracle AI sailed the world on Royal Navy flagship via cloud-at-the-edge kit
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