Loading page…
A Berlin company sells a €200 door controller at 50% margin, then charges €10 per door per month for the platform on top — and has never lost a customer, because ripping it out means visiting every door in the building.
≈€500K of that recurring (≈$574K ARR by the host's conversion) · 5,000 doors live across ~20 logos · ~€10/door/month list price before heavy discounts · ~50% hardware margin · zero churn since the 2016 launch · >€5M raised, not yet profitable
"I call our door controllers the Trojan horses to the buildings — that's by the way why I give so much discount on the recurring, because I know once I have them we have zero churn."
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Michael von Roeder is not Sensorberg's founder. He was an investor in the Berlin company and stepped in as CEO — by his own description, "in a difficult place" — inheriting about 30 people. The relationship with the founder survived: the founder sits on his board and they were having lunch the following week. The product had launched in 2016. It starts with hardware door controllers that turn a building's access points into something programmable, and then layers a cloud platform on top that brings in sensors and actuators — heating valves, temperature sensors, lighting control. The promise is that you unlock the building, book a meeting room, and take delivery of an Amazon package or your groceries through one system, on a deliberately open platform rather than the proprietary stack von Roeder expects from GE or Siemens. The wedge is co-working spaces. They already run a member app for community, and Sensorberg makes that app control the physical space as well. Corporates then adopt co-working concepts internally, and that is the road into corporate buildings. The numbers he gave Nathan Latka in January 2019: roughly €2.5M of total revenue that year, of which about €500K is recurring — Latka converts that to about $574K of ARR. Five thousand doors live across roughly twenty logos, at a list price near €10 per door per month with heavy discounting. Hardware carries about a 50% margin. The company loses money, has raised more than €5M, and was raising a low-single-digit-million round to reach break-even in late 2019 or early 2020 at around a €20M pre-money target. The number that makes the whole thing worth studying: zero churn, across the entire history of the company.
Sensorberg does not start with the landlord. It starts with co-working operators, because they already run a member app and already treat their space as a product.
The quick-reference card — acquisition channels, replication playbook, and risk map — is members-only.
Join the Unicorn Club — $5/moCancel anytime, in one clickPaste into Claude Code / Codex and get a working version of this product end-to-end.
Two production-grade prompts per idea — a full build spec and an SEO growth plan — plus 10 tailored build specs a week. Members only.
Join the Unicorn Club — $5/moCancel anytime, in one clickEvery claim traces back to a listed source — open any of them and check the number yourself.
The full captured transcripts behind these sources are in the Unicorn Club — search them, quote them, check every figure. Join the Unicorn Club
Data credibility: Founder-reported, in a January 2019 interview on Nathan Latka's show, where the host does most of the arithmetic out loud and von Roeder confirms or corrects it. Nothing here is third-party verified: there is no dashboard, no filing and no analyst data. Two cautions about the numbers. First, the auto-caption garbles the top line — the transcript reads "25 million euros" but both men immediately work from €2.5M, and von Roeder corrects Latka's €250K recurring estimate up to "about 500, 500ish," so ≈€2.5M total with ≈€500K recurring is the reading we use. Second, the widely quoted "$50K per month in SaaS" is Latka's list-price arithmetic (5,000 doors × €10), and von Roeder explicitly answers that it only holds theoretically because the discounts are heavy. The zero-churn claim, the 50% hardware margin, the €200-plus unit cost, the €5M-plus raised and the €20M pre-money target are all his own statements. The figures are from early 2019 and have not been re-checked since.
The first money is hardware money. A customer buys door controllers — devices that cost Sensorberg more than €200 each to make and carry roughly a 50% margin — and the €10 per door per month starts once the hardware is on the wall.
Expansion, not acquisition, is what compounds here. A co-working chain opens a new location every month and Sensorberg walks in with no additional sales effort — Unicorn went from one space to six in two months, with twenty planned for the following year.
A year-long sales cycle means that for most of any quarter nothing measurable happens, and Sensorberg carries a hardware bill while it waits. The company loses money; von Roeder was raising a low-single-digit-million round specifically to reach break-even in late 2019 or early 2020, on top of the €5M-plus already in.
The rest of this breakdown — 9 more sections — is in the Unicorn Club, with every section of all 1,162 ideas: first customers, first dollar, the flywheel, and the silent stretch.
Join the Unicorn Club — $5/moCancel anytime, in one click