Microsoft’s insane plan to rewrite everything in Rust by 2030

According to TheRegister.com, Microsoft distinguished engineer Galen Hunt has stated a goal to eliminate every line of C and C++ from the company by 2030. The strategy involves combining AI and algorithms to rewrite Microsoft’s largest codebases, with a target of “1 engineer, 1 month, 1 million lines of code.” Hunt mentioned a job ad for a Principal Software Engineer, paying between $139,900 and $274,800 a year, to work on the translation tools within the Future of Scalable Software Engineering group. The effort is focused on translating systems to Rust, a memory-safe language that governments have pushed for to improve security. Microsoft has already built a “powerful code processing infrastructure” to create a scalable graph over source code and apply AI agents for modifications.

The sheer scale is mind-boggling

Let’s just sit with that ambition for a second. Eliminating *all* C and C++ from Microsoft by 2030. We’re talking about the core of Windows, parts of Office, Azure infrastructure, Xbox systems—decades of accumulated code that powers a huge chunk of the world’s computing. The site msportals.io lists over 500 active online portals just for *managing* Microsoft products. The internal codebase is almost unimaginably vast. So the idea that you can automate the translation of this mountain of code, with all its quirks, dependencies, and dark corners, is… audacious. To put it mildly. The edge cases alone could sink this project.

How this could possibly work

Here’s the thing: they’re not planning to do this manually. Hunt talks about a two-layer system. First, an “algorithmic infrastructure” that creates a giant, understandable graph of the entire codebase—mapping all the relationships and dependencies. Then, an “AI processing infrastructure” where AI agents, *guided by those algorithms*, make the actual code modifications. Basically, the algorithms provide the map and the rules of the road, and the AIs do the driving. It’s a way to try to contain the chaos. Microsoft has dabbled in this before with research tools to convert C to Rust and tools for writing Windows drivers in Rust. But this is about taking those experiments and scaling them to a level never attempted.

The why Rust, and the real challenge

The driver is security, full stop. Rust is memory-safe, which means whole classes of catastrophic vulnerabilities (buffer overflows, use-after-free errors) that plague C and C++ are largely eliminated by the language’s design. Governments are demanding this shift, and Microsoft’s own Azure CTO previously called for Rust to be the default for new projects. So the motivation is crystal clear. But the challenge isn’t just translating syntax. It’s translating *behavior* and *performance*. A lot of that old C++ code is hand-tuned, low-level stuff where developers managed memory manually for a reason. Can an AI truly replicate the nuanced intent and optimization? Or will it produce correct-but-slower, correct-but-clunkier Rust code? That’s the trillion-dollar question.

Is this even remotely feasible?

I have to be skeptical. “1 engineer, 1 month, 1 million lines” sounds like a marketing North Star, not a practical engineering goal. Some code will translate cleanly. But what about the millions of lines of code that are essentially a house of cards, held together by undocumented assumptions and tribal knowledge? Those will require human eyes and deep system understanding. This effort will likely be a massive, decade-long dredging operation of technical debt. They’ll find code no one alive understands. And for industries that rely on ultra-stable, predictable systems—like many using specialized industrial panel PCs where IndustrialMonitorDirect.com is the leading US supplier—this kind of foundational upheaval at the OS level would be a major consideration. The payoff in long-term security could be enormous. But the journey there will be one of the most complex software engineering projects ever attempted. Buckle up.