William Saar @saarw
Freelancer | Backend and data engineering for Spotify and Candy Crush, helped build SF-based appsec startup, financial trading tech @javamissionctrl updab.com Stockholm + Remote Joined October 2012-
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People asked me what it was like to use AI to port a C library to Rust, so I wrote an article with the details updab.com/blog/porting-a…
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William Saar retweeted
Claude Code: no evals [well known code agent company]: no evals [well known code agent company 2]: kinda halfassed evals [leading vibe coding company]: no evals [ceo of company selling you evals]: mmmmm yess all my top customers do evals, you should do evals [vc's in love…
Claude Code: no evals [well known code agent company]: no evals [well known code agent company 2]: kinda halfassed evals [leading vibe coding company]: no evals [ceo of company selling you evals]: mmmmm yess all my top customers do evals, you should do evals [vc's in love… https://t.co/qKlxIZsZet
Not bothering to use a blog tool, just writing things up in Markdown and having Claude Code translate it into a blog with the look of the site.
A positive somewhat surprising observation from the libinjection port was that Claude's guardrails never tried to block any of the work This is even though the codebase was full of malicious string patterns that hackers had used in real attacks that the library protects against
Just published my vibe port of the security library libinjection from C to memory-safe Rust The library is for detecting SQL injection and cross-site scripting attacks and was ported with GPT-5 and Claude Code crates.io/crates/libinje…
Claude Code analyzing and complimenting its previous work on the C to Rust port. Well deserved! (even though I strongly doubt it really checked the entire codebase this time either)
Watching Claude Code burn through precious Opus quota on multiple attempts to run the debug program it generated in the wrong directory 🥲
Prompt injections to avoid traditional malware detection tools
Prompt injections to avoid traditional malware detection tools
Important advice from @MaxJunestrand at 31m 50s about selling high-ticket SaaS products that goes against much of the ship-always startup advice When each sale really matters, it's worth investing in scale and reliability even at the expense of sales opportunities
Important advice from @MaxJunestrand at 31m 50s about selling high-ticket SaaS products that goes against much of the ship-always startup advice When each sale really matters, it's worth investing in scale and reliability even at the expense of sales opportunities
People like to complain about vibe coding, but it was actually vibe management that made remote work fail at many companies Hopefully, AI coding brings a broader realization that you need to understand what's actually getting done to manage it effectively
Took a stab at using GPT-5 and Claude Code to port a C library with lots of logic to Rust. Used GPT-5 to create a porting plan and Claude Code to execute the port. Claude is taking every opportunity to implement and sell me on "simplified" or "similar" versions of the code.…
Memory-unsafe languages letting attackers hack iPhones and Macs by sending them images that trigger memory corruption
Memory-unsafe languages letting attackers hack iPhones and Macs by sending them images that trigger memory corruption
Surprisingly sober idea from the EU to make the digital Euro a serious competitor to credit cards, US stablecoins, and even cash Great for digital finance in the region while providing independence from foreign credit card companies
Surprisingly sober idea from the EU to make the digital Euro a serious competitor to credit cards, US stablecoins, and even cash Great for digital finance in the region while providing independence from foreign credit card companies
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