In the previous post, I argued that the next decade of consumer hardware winners will look more like Oura than like the engineering-led startups that defined the 2010s, and that the reason is design judgment at the founding-team level, not after.
This is the worked example.
In 2014, the founders of Oura couldn’t make payroll. Employees lived on personal credit cards and kept showing up anyway. Ten years later, the company they built is worth $11 billion, has shipped more than 5.5 million rings, and supplies smart rings to the U.S. military.
The founding team
The founding team mattered specifically. Three engineers from Oulu, Finland: Petteri Lahtela, Kari Kivelä, and Markku Koskela, combined two flavors of expertise. Lahtela and Koskela came out of the Nokia/Polar diaspora, the deep bench of senior hardware engineers that flooded northern Finland after Nokia’s handset business collapsed. That gave them sensor expertise no consumer-tech startup in the Bay Area could have matched at any price.
Kivelä was different. He had the Nokia software background, but he was also a trained jewelry designer. That second skill is the one that made Oura possible.
A wrist-based device interrupts sleep. A chest strap is uncomfortable in daily life. A ring was the only object humans already wore continuously, forever, without thinking about it, and the only way to make a ring people would actually wear 24/7 was to make it look like jewelry, not like a medical device. That insight is obvious in retrospect but was not obvious in 2013, when every other wearable on the market was a wrist-strapped piece of plastic with a screen.
Strip Kivelä out of the founding team and Oura is a different company. Probably a failed one. The sensor tech would have shipped in some other form factor: a wristband, a patch, a chest strap, and it would have been competing directly with Fitbit and Apple, which is a competition Oura would have lost. Instead, the founding team made a category-defining bet on a form factor that nobody else had the design instinct to attempt, and they had it right from day one because the design instinct was on the cap table.
The part most case studies miss
The Gen 1 ring was, by the founders’ own admission, not the product they wanted to build. It was bulky, ceramic-looking, compromised. They shipped it anyway and the 2015 Kickstarter raised $650,000 from 2,400 backers and was, in honest terms, an emergency funding round dressed up as a pre-order. Cash flow was a significant challenge in the early days, with salaries sometimes delayed for months, as one long-time employee later put it.
But the design conviction that made it a ring at all was right. And in 2017, something unexpected happened: the Stanford Research Institute quietly bought two Gen 1 rings off Kickstarter, tested them against polysomnography (the clinical gold standard for sleep measurement), and published that Oura was the most accurate consumer sleep wearable they’d ever measured. Oura didn’t commission the study and didn’t know it was happening. It did more for the brand than the next $50M in marketing spend.
Where the design-cofounder advantage compounds
Then came Gen 2, and this is where the design-cofounder advantage compounds. The three-year gap between Gen 1 and Gen 2 was mostly spent on a single supply chain problem: finding a battery vendor who could build a custom cell small enough, dense enough, and repeatable enough to fit a wedding-band form factor. That was the constraint. The design specification: it has to look like jewelry, drove the engineering challenge. Most startups solve this the other way around: the engineering constraints define what the product looks like, and you end up with something nobody wants to wear. Oura held the design line and forced the engineering to catch up. That’s only possible when design has founder-level authority.
The numbers from there are the part everyone knows: Gen 2 launched at Slush in 2017. ~10,000 units in the first months. 100,000 by August 2019. The pandemic accelerated everything: the UCSF Tempredict study put 65,000 Oura users into clinical research and made the brand category-defining. Gen 3 in 2021, with the $5.99/month subscription that turned a hardware business into a SaaS-with-a-device. $100M Series C the same year. $200M Series D at $5.2B in 2024. $900M Series E at $11B in October 2025. More than half of all 5.5M rings ever sold were sold in 2024 alone.
The compounding payoff
What the post-2018 numbers actually show is the compounding payoff of decisions the founding team made in 2013. The form factor decision. The decision to ship Gen 1 imperfect rather than wait for Gen 2 perfect. The decision to spend three years on the battery problem rather than compromise the form factor to fit an off-the-shelf cell. Each of those was a design-led decision in a company that, on paper, was a sensor startup.
Three lessons
- Design conviction at the founder level lets you hold form-factor lines that engineering-led teams will compromise. If the form factor is wrong, the product fails. Engineering can be hired in. Design conviction at the founding level usually can’t.
- Ship the imperfect version to fund the right one. Your Gen 1 is a data-collection exercise dressed up as a product. Price it, ship it, plan for Gen 2 from day one. But hold the design conviction across both, the thing that makes Gen 1 worth shipping is that Gen 2 will be the right design.
- Credibility you didn’t pay for compounds faster than credibility you did. Build products that prosumers, tech enthusiasts, or researchers want to test. The Stanford study did more for Oura than any marketing campaign could have, precisely because Oura didn’t commission it.
Oura is the cleanest example of the design-as-cofounder thesis I argued in the previous post. It’s not the only one. Next in the series: Teenage Engineering, where the founding team was all designers and the resulting company has 25 years of pricing power to show for it.