Why Is 90% vs 100% a 10x Difference?
An org where 90% of engineers use AI and one where 100% do produce completely different results. The reason: if even 10% work the old way, the whole org has to lean back into that world to accommodate them.
Certain things only open up when no one is typing into a code editor by hand: working on many features and bugs in parallel, and — because code is cheap — prototyping risky ideas to run more experiments. Just a 10% exception closes off all of these possibilities.
What Does It Mean for 15 People to Run 4 Products?
The US company Every runs four software products with 15 people. AI agents write 99% of the code, and a single developer owns each app. It has over 7,000 paying subscribers and has raised only about a million dollars.
These are not toy apps; one person builds and maintains complex production products. This structure would not have held a few years ago — not even a year ago. Delegating tasks to agents and working in parallel is what made it possible.
What Is Compounding Engineering?
In traditional engineering, each feature makes the next feature harder to build. The goal of compounding engineering is the opposite: to make sure each feature makes the next one easier.
The method is a four-step loop — plan, delegate, assess, codify. The key is the last step. You take the tacit knowledge gained while planning, delegating, and assessing, and codify it into prompts the whole org shares. This growing prompt library raises the starting line for the next task.
What Second-Order Effects Does This Create?
Codifying tacit knowledge brings non-obvious second-order effects. Just point your agent at the next developer's repo and the AI reads their implementation and ports it to a different tech stack. New hires are productive on day one, already set up with the environment and how to write a good PR.
Bug-fix PRs flow between products, and you don't have to standardize on one stack because AI translates across languages and frameworks. Even managers and the CEO commit code — because instead of needing a 3–4 hour focus block, you can delegate an investigation between meetings and come back to submit a PR.