Why subcontractor communication hubs fail on the side that did not buy them

The general contractor buys the hub and the subcontractor is asked to change how they work for no direct benefit — which is why cross-company construction coordination products quietly decay into another email thread. Annija Eizenarma, a founder, investor and adviser to technology companies selling into legacy industries, describes a market where one design partner can open 15 doors. Trunk Tools raised a $40M Series B into this problem in July 2025.

Retrieving an answer from project documents is a solved engineering problem. Routing a message is trivial. What stays hard is that construction coordination is a multi-party trust problem wearing a software problem's clothes, and most vendors are pricing the software problem.

Why doesn't this buyer want to hear about AI?

Because they are not shopping for it. Annija Eizenarma was direct about the posture vendors walk into, speaking to Artificial Reality, the AI buyer-evidence podcast hosted by Galina Fendikevich:

"Legacy industry buyers, they really don't want AI for AI. They're truly, in a way, skeptical for what AI stands for, and in many ways they really don't want anything to do with it."

A product that leads with its model architecture is solving for the wrong audience. The construction operator is buying fewer missed messages, not inference. Her instruction on language is blunt: "as little tech words as possible, more focusing on the solution itself and the end outcome."

Why do full-platform pitches stall?

Scope. The most common failure she described is showing the whole product:

"It's overwhelming for the legacy industry buyer to even learn about all these features and all of the use cases and all of the tools you have built... taking it one step at a time and not exposing all of the ideas, all of the vision you have right away is often a very smart move."

What replaces it is a single provable job. In her words, "the most successful ones are the ones who can really narrow down their focus and focus on one thing only to begin with... by starting with one specific task that you can solve, you can show the results and you can build that trust afterwards." Coordination suits that shape, because the pain is daily and the value is provable in weeks rather than quarters.

The same test applies to your own roadmap. Constructable is AI-native construction management for mid-size general contractors, backed by Y Combinator (S23) and Khosla Ventures; Clearstory sells change orders specifically, on a $16M Series B from June 2024. One of those is a platform adoption decision and one is a narrow one, and the buyer feels the difference immediately.

What do founders get wrong before the first meeting?

They build for months without contact with the trade. Galina Fendikevich raised a pattern she observed firsthand at a large construction trade show in New York: a handful of AI companies were present, but they did not appear to be speaking to the day-to-day reality of the contractors in that city. Annija Eizenarma identified the same root cause from the vendor side — founders who spend three or four months building before ever meeting a customer, then discover "there's friction and it's really hard. You know, you have to fly to Texas, you have to fly to Arizona."

Why is the referral loop product feedback, not go-to-market advice?

Because in a referral market, counterparty adoption and distribution are the same problem. Her description of how legacy industries buy:

"The industry players really listen to each other, and if you find somebody that can truly recommend your product from their industry and vouch for you, that is the absolute golden card... One design partner at the beginning can open 15 doors later."

Read that as product feedback and it says something sharper than a sales tip. A hub that a subcontractor recommends to the next general contractor solves adoption and distribution at once. A hub that a general contractor imposes on subcontractors solves neither.

What nobody has built

A subcontractor-first hub. Nearly every product in this category is sold to the general contractor and adopted by everyone else: Trunk Tools layers agents onto the general contractor's existing documentation, Clearstory connects contractors and specialty subs around change orders, Assignar coordinates crews and field data on roughly $45M raised, founded by a former subcontractor.

The inversion is a tool built for the subcontractor first — one that makes their day easier across all the general contractors they work with, and produces a clean coordination record as a byproduct. As far as Artificial Reality can determine from public materials, no one is building that.

What to change in your roadmap

• Name the party who must change behaviour, and price for them. If it is the counterparty who does not pay you, sub-side effort is your core product metric, not an onboarding detail.
• Ship one workflow, and a 30-day result to go with it. Legacy buyers evaluate a claim they can check within a month.
• Strip the vocabulary. If your first screen cannot be explained without the word model, you are pitching the wrong buyer.

The question worth answering before your next release: would a subcontractor who has never met you keep using your product on a job where a different general contractor is paying for it?

Where this comes from

S1E1: They do $20M a year on sticky notes — the full interview with Annija Eizenarma. Listen or watch: YouTube, Spotify or Apple Podcasts.