Most hardware startups do not fail because of bad engineering. The engineers are usually capable. The ideas are often solid. They fail because the team starts building before they know what they are building.
I have watched this happen more times than I can count. A team gets excited, jumps into R&D, and assumes the details will sort themselves out along the way. There is even a saying in Turkish that captures this perfectly: "Kervan yolda duzulur." The caravan sorts itself out on the road.
That philosophy works in software. You can refactor code on a Tuesday afternoon. You cannot refactor a PCB you ordered eight weeks ago. In hardware, the caravan does not sort itself out. It gets stuck, runs out of budget, and gets abandoned at the side of the road.
The planning problem
What I see most often is a team that cannot answer basic questions about their own product before they start designing it. What does this device actually do? What does it explicitly not do? What does version two look like? How does it get manufactured at 10,000 units?
When these questions go unanswered, features get added mid-development. Scope creeps into the hardware. A component gets added that the PCB was not designed to support. The board needs a respin. The respin pushes the timeline. The timeline pushes the budget. And suddenly a product that was supposed to ship in six months is eighteen months in with nothing to show.
The painful part is that all of this was predictable. Not because the engineering was hard, but because the thinking was skipped.
The cost of figuring it out late
Here is a concrete example of what skipping the planning phase actually costs. Component pricing at low volumes looks very different from pricing at scale. A part that costs $2.00 when you order 500 units might cost $0.38 when you order 50,000. If you did not design your BOM with that curve in mind, you might hit volume and discover your product is not actually viable at the price you planned to sell it.
That is not an engineering problem. That is a planning problem. And by the time you find out, you have already built tooling, written firmware, done certifications, and lined up a contract manufacturer. Changing direction at that point does not mean a quick fix. It means starting significant parts of the project over.
The product family trap
The issue I find most revealing is the product family question. Ask a hardware startup founder early in their process: what does your product family look like in three years? Most cannot answer it. They are focused entirely on getting the first product out.
That is understandable, but it is expensive. If you do not design the first product with a family in mind, you end up with a custom one-off. No shared BOM across variants. No common firmware base. No manufacturing leverage. When the time comes to build a second product, you are not building on a foundation. You are starting from scratch again.
The companies that scale hardware efficiently made decisions on their first product that looked unnecessary at the time. They used a microcontroller with headroom they did not need yet. They designed the PCB with footprints for optional components. They structured their firmware so new features could be added without rewriting the core. They were thinking about products two and three while building product one.
That is not overengineering. That is planning.
What the planning phase should actually look like
Before a single schematic gets drawn, a hardware team should be able to answer these questions clearly:
What does this device do, and what does it not do? A clear feature boundary prevents scope creep from infecting the hardware. If it is not in the spec before the PCB is designed, it does not get added mid-development.
What does the BOM look like at volume? Run the numbers at 1,000, 10,000, and 100,000 units before you commit to components. Know where your cost floor is and whether the business works at that price.
How does this get manufactured? Design for manufacturability is not something you add at the end. It shapes decisions from the beginning: component placement, test point access, assembly process, packaging. Getting a contract manufacturer involved early, even just for a review, saves significant rework later.
What does the product family look like? Even a rough sketch of two or three variants helps you make better decisions on the first product. Shared components, common connectors, a firmware architecture that supports multiple hardware revisions: none of this is hard to plan for, but it is very hard to retrofit.
What are the certification requirements? FCC, CE, UL, medical certifications: these take time and money and they affect design decisions. Finding out about them after the PCB is designed is a common and costly mistake.
The caravan needs a map
None of this means you need a perfect plan before you start. Hardware development is iterative and surprises are inevitable. But there is a difference between iterating on a solid foundation and improvising your way through a project with no map.
The teams that ship on time and on budget are not better engineers than the ones that do not. They are better planners. They asked the hard questions before the hard questions became expensive problems.
The caravan does not sort itself out. Give it a map.
Next Thursday: Why hardware founders without a technical background often set their products up to fail, and what they should do differently.