Crunchloop's thinking — engineering notes, product updates, and ideas from the team building Dap.
May 20, 2026 · Martín Fernández
Last month we wrote about forking Bun because waiting on upstream wasn't an option. This month we did something harder: we stopped trying to bend a CLI into a library and wrote our own. Here's how we decided that was the right call.
May 18, 2026 · Iván Etchart
A study on how AI is repricing engineering work, why the impact is uneven, and where the value of human engineering judgment is concentrating.
Apr 22, 2026 · Iván Etchart
The one thing this AI transition needs that we can't measure: trust. And the humans behind the product that earn it.
Apr 14, 2026 · Ignacio Cesarani
We got so comfortable in Claude Code's harness that we confused the armor with the warrior. When you move your agent to another harness, you discover what was you and what was the scaffolding all along.
Apr 8, 2026 · Martín Fernández
AI lowered the barrier to contributing to open source. It didn't lower the standard. Here's what a month of contributions across Bun, Prisma, Bottlerocket, and WebKit taught us about what that actually means.
Mar 26, 2026 · Iván Etchart
Unit tests with mocks can't catch an AI agent that confidently ships broken behavior. Gherkin scenarios backed by real integrations can. Here's what ten months of that looks like.
Mar 12, 2026 · Martín Fernández
AI writes code in minutes. Then the pipeline takes over — and the speed disappears. Most teams are optimizing the wrong side of the equation.
Mar 4, 2026 · Damián Arrillaga
We invested heavily in working around AI limitations. Now the AI waits for us. The bottleneck flipped, and most teams haven't noticed.
Feb 26, 2026 · Martín Fernández
Most TypeScript teams believe they have type safety. They're half right. We built Dap so that a type defined in the deepest layer of the stack is still enforced five packages away — and learned what that actually costs.
Feb 18, 2026 · Ignacio Cesarani
We started by researching everything. Then we realized research without building doesn't converge. What we weren't ready for was how fast things would move once we started.
Feb 11, 2026 · Martín Fernández
One feature. Twenty-five files. Six packages. Over a thousand lines in a single pull request. In a multi-repo setup, that's six contexts and a human to stitch them together. In the monorepo, the agent shipped it coherently.
Feb 4, 2026 · Damián Arrillaga
AI changed how fast people can produce. It also changed how hard it is to learn. We're building Dap to find the signal under the noise.
Feb 2, 2026 · Iván Etchart
AI changed the economics of technical debt. As the old debt got cheaper, other kinds of debt became visible—higher up the stack, harder to name.
Jan 19, 2026 · Martín Fernández
After four years of building software alongside our customers, we're building something to make those partnerships deeper. Here's why.