What is Conway's law?
Conway's law is an observation from 1967 by Melvin Conway: any system a group designs will copy the communication structure of that group. In plain terms, if four teams build a compiler, you get a four-pass compiler. The shape of your software ends up matching the shape of your org chart, whether you plan for it or not.
In plain words
Imagine three separate kitchens cooking one dinner, each in its own building, talking only by phone. The meal arrives in three disconnected courses that do not quite go together. The food reflects how the cooks were organized, not what the diner wanted. Software works the same way.
Why it matters for your business
- Architecture follows teams. If two teams rarely talk, the parts they own will integrate poorly. Slow handoffs and unclear ownership show up directly in the product.
- You can use it on purpose. The "Inverse Conway Manoeuvre" means shaping teams to match the architecture you want. Want loosely coupled services? Build small, independent teams that own them end to end.
- Reorgs are technical decisions. Moving people between teams quietly rewrites which parts of the system can change quickly and which will calcify.
Common pitfalls
- Ignoring it during a reorg. Leaders reshuffle teams for headcount reasons and are surprised when the architecture starts to drift and fragment.
- Fighting the law with process. No amount of documentation fixes a system split across teams that do not communicate. Fix the communication, not just the diagrams.
- One team owning too much. When a single team owns everything, the system becomes a tangle that only that team understands.
Related articles:
- What is platform engineering? - Structuring teams and tooling so product teams move fast.
- What is an internal developer platform? - A shared layer that shapes how teams interact with infrastructure.
- What is a monorepo? - How code structure and team structure interact.
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