Here's the pattern: engineering budgets at post-PMF companies grow faster than the product, and the budget looks justified. The architecture gets a small upgrade, the team gets a few more people, the roadmap absorbs another integration. Every individual decision is reasonable, so where does the cost actually go? It hides in the gap between decisions: the compounding, the waiting, the integration overhead that grows whether or not anyone is paying attention. That's the cost curve, and nobody owns it. The only thing longer than the curve is the list of reasons nobody is tracking it.
I wrote a book about this, and The Engineering Tax covers 29 chapters on the costs that compound after product-market fit: coordination overhead, integration sprawl, organizational friction, technical decisions that look harmless on day one and expensive once the cost has had time to compound. Each chapter pulls one cost out of the noise, names it, and shows how to measure it before it eats the margin.
Why a book and not a blog post? The costs compound across years, and a short post can't show the curve. They also interlock, meaning you can't address one cleanly without addressing the others. Integration sprawl, organizational structure, AI tools, technical debt, they all push on each other. A book is the smallest format that fits the actual problem.
Who it's for: founders and CTOs at post-PMF software companies (Series A through B, 25 to 200 engineers) who feel their team is moving slower every quarter but can't point to a single line item in the budget, and if that sentence hit, the book is probably for you. You know the cost is there. You just can't see it on any spreadsheet, and the spreadsheet is the only thing the board is looking at.
I shared the first chapter as a free read, and it walks through one specific cost pattern (the cost of teams waiting on each other in code reviews, in design reviews, in integration testing) and shows how it becomes an annual cost with nobody signing the check. The rest of the book goes wider and deeper, across the full post-PMF cost surface.
If you want early access when the book is ready, I opened a waitlist. One email when the book ships, and that email is the announcement.
Link: https://beamersoftware.com/the-engineering-tax/
What invisible cost is your team paying right now that nobody is tracking? Drop a specific example in the comments.
Dollars, hours, or both, whatever you can measure.
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