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Dimitrie Stefanescu

CommitmentToCommunity

Dimitrie
Stefanescu
CEO@Speckle
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Open Source in AEC with Speckle by Dimitrie Stefanescu

Dimitrie Stefanescu is the founder and CEO of Speckle, an open source data platform for architecture, engineering, and construction. What started as a side project during a research fellowship at UCL London is now a venture-backed construction tech startup serving enterprise clients across the global built environment, from Jacobs to Foster + Partners.

What This Masterclass Covers

The AEC industry is locked into proprietary software, opaque file formats, and siloed workflows. Dimitrie's challenge: how do you build an open source construction software platform for a 12-trillion-dollar industry that has never operated that way, and turn it into a business?
In this masterclass, Dimitrie Stefanescu walks through the full journey from academic research to an open core business model, and shares the hard-won lessons along the way:

  • Why making Speckle fully open source was the fastest path to trust, and enterprise adoption, in a closed-source industry
  • How bottom-up community growth around Speckle turned into top-down enterprise deals, including a Discourse forum post that led to the CTO of Jacobs
  • The shift from open source project to open core business model: what to keep open, what to commercialize, and how to bring your community along
  • Why iterating on your business model matters more than iterating on your product
  • The hiring mistake most early-stage construction tech startups make, and why "anti-selling" your company attracts better talent
  • Where AI delivers real value in AEC today (parsing RFIs, scanning documents), and why 95% accuracy is a dealbreaker when buildings need to stand up
  • How to move from consensus-driven to velocity-driven culture without breaking what made you special

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Q&A

Question: What core problem in AEC does this masterclass tackle, and how does Speckle address it?
Short answer: The AEC industry is constrained by proprietary software, opaque file formats, and siloed workflows. Speckle’s approach is to build an open source data platform that creates trust through transparency, enabling interoperability and accelerating enterprise adoption in an industry that has historically been closed.

Question: How did community-led growth translate into enterprise deals for Speckle?
Short answer: Speckle grew bottom-up through an engaged open source community, which organically surfaced the platform inside large organizations. A notable example is a Discourse forum post that ultimately connected the team to the CTO of Jacobs, illustrating how grassroots interest can lead to top-down enterprise engagements.

Question: What does moving from open source to an open core business model involve?
Short answer: The masterclass explains how Speckle evolved from a fully open source project to an open core company—keeping the foundational technology open while commercializing select capabilities for enterprise needs. It also covers how to decide what remains open, what becomes paid, and how to bring the community along during that transition.

Question: Where does AI deliver real value in AEC today, and why isn’t 95% accuracy acceptable?
Short answer: Practical AI wins today include parsing RFIs and scanning documents—tasks where automation reduces manual effort and errors. However, in safety-critical contexts like buildings, 95% accuracy is a dealbreaker; the remaining 5% can have material consequences, so higher reliability is essential.

Question: What organizational lessons does the masterclass highlight beyond product development?
Short answer: It emphasizes that iterating on your business model can matter more than iterating on the product, warns about a common early-stage hiring mistake in construction tech, and explains why “anti-selling” your company can attract stronger talent. It also covers how to shift from a consensus-driven to a velocity-driven culture without losing what makes the team special.