@speed-engineer

The Sunday Notebook: What a Two-Product Week Quietly Taught Me

6h ago · 2 min read · The Sunday Notebook: What a Two-Product Week Quietly Taught Me Most Sundays I scroll back through the week's commits, support tickets, and Slack threads, looking for the lesson hiding in the noise. This week I found five. I'm working on two things in...

How a 64-Byte Constant Quietly Doubled My Throughput

1d ago · 3 min read · How a 64-Byte Constant Quietly Doubled My Throughput There's a number I keep tattooed on the back of my brain when I'm designing wire formats. It's 64. That's the cache line size on every x86_64 and ARM CPU you're likely to deploy on. And ignoring it...

The founder lesson I wish someone told me sooner: your first 100 users don't want what you think they want

2d ago · 3 min read · Your first 100 users don't want what you think they want Six months ago I shipped FillTheTimesheet, a time-tracking app for freelancers and agencies. The pitch in my head was gorgeous: automated tracking, smart categorization, AI-assisted client bill...

I Watched Our Team Rewrite the Same AI Prompt 11 Times in One Month

3d ago · 3 min read · I'm not exaggerating. Eleven times. I was doing a quick audit of how our team was using ChatGPT, and I searched Slack for "prompt" to see what was being shared. What I found was the same basic "write a product description" prompt, reinvented slightly...

A $2,400 Mistake That Changed How I Track Time as a Freelancer

4d ago · 2 min read · I'm going to tell you about the most expensive spreadsheet I ever used. For years, I tracked my freelance hours in a Google Sheet. Column A: date. Column B: client. Column C: hours. Column D: a vague description I typed from memory at 10pm. It worked...