They taught me the OSI model with a Taco Bell burrito.
It was 1996 and I was sitting in a windowless room at the back of a call center with thirty other people who'd been hired to answer phones for an ISP that was growing faster than it could train anyone. The company was one of the early national players — the kind that bought regional dial-up providers whole and stitched them together into a coverage map that looked impressive in a boardroom and made no sense on the ground. Our job was to sit between the customers who couldn't get online and the infrastructure that couldn't explain why.
The instructor held up a burrito. Or maybe he drew one. The details blur, but the lesson stuck. Seven layers, he said. Physical is the tortilla — the thing that holds it together. Data Link is the rice. Network is the beans. Transport is the meat. Session is the cheese. Presentation is the sour cream. Application is the salsa on top. You can see the salsa. You can taste the salsa. But if the tortilla tears, everything falls in your lap regardless of how good the salsa is.
It was a terrible analogy and I've never forgotten it.
We were Tier 2 — the escalation team, the people the front line sent the calls they couldn't close. Modem negotiation failures. DNS resolution problems. PPP authentication loops. Connection drops that happened every thirty minutes like clockwork because somewhere in the chain a piece of equipment was on a timer nobody documented. The front line would follow the script and when the script ran out, they'd send the call to us, and we'd do the thing the script couldn't do: think.
The call center ran on paper. When I got there, every call was logged by hand — tick marks on printed sheets, tallied at the end of the shift, typed into a spreadsheet the next morning. By the time anyone saw the numbers, the outage was twelve hours old and the customers had already called back twice. The data existed. The pattern existed. But the instrument to see it in real time didn't.
So I built one. A Java dashboard, wired into the call disposition system, updating in real time. Nothing fancy. A floor map. Color-coded indicators. Call counts by category, by region, by ingress phone number. The kind of thing that, if you stared at it for ten minutes, would tell you things that the paper tallies couldn't surface in ten hours.
The first thing it caught was the modem chases.
We'd been getting intermittent reports — connection failures on specific dial-up numbers, scattered enough across the shift that no single agent saw the pattern. Three calls about dropped connections from Georgia in ten minutes was just three calls. But on the dashboard, three calls from the same ingress number in the same window was a cluster. A signal. The leading edge of something that would be an outage in an hour if nobody touched it.
We started dispatching before the outage reports came in. The dashboard turned reactive support into proactive support, and the agents went from chasing failures to catching them. The same tool, scaled up, eventually replaced the paper system entirely. Three call centers consolidated into one. Productivity numbers that made the managers look good in meetings they invited me to attend but never asked me to speak at.
I won three employee awards in a row. I didn't stay. The company was growing in the way companies grow when the growth is the product and the infrastructure is an afterthought, and I could see the gap between what the org chart said was happening and what was actually happening widening faster than anyone was willing to admit. I'd learned what I needed to learn.
Seven layers. The burrito. And the thing I'd carry into every job after that: the instinct to build the instrument that nobody asked for, because the existing instruments were measuring the wrong things.
Every story in this book is, in one way or another, about that instinct. About walking into a room where the dashboards are green and the systems are dying, and building the tool that shows what's actually happening. The tool nobody requested. The tool nobody budgeted for. The tool that, when it finally lights up with the truth, makes the room go quiet.
It always starts the same way. The dashboard says everything's fine. The burrito says check the tortilla.