Short Answer
When startups scale beyond roughly 150 employees, informal communication and founder-driven coordination stop working. Without explicit systems for decision ownership, role clarity, and cross-team communication, execution slows even if the company keeps hiring.
TL;DR
- Around 150 people, informal communication collapses
- Founders can no longer maintain alignment personally
- Execution slows because ownership and decision boundaries become unclear
- Companies must replace relationship-based coordination with operating systems
- Teams that design communication, authority, and role clarity scale successfully beyond the Dunbar threshold
What Is the “Dunbar Wall” in Startups?
Anthropologist Robin Dunbar proposed that humans can maintain stable relationships with roughly 150 people.
Below this number, coordination often happens naturally.
People know:
- who owns what
- what others are working on
- where decisions are made
As companies grow, these signals must become explicit — not only for internal alignment but also for candidates evaluating whether the company is organized enough for them to succeed. (Read: Why Your Startup Isn’t Attracting Top Talent — And How to Fix It)
Communication happens informally.
But once a company approaches 150 employees, this natural coordination collapses.
The number of potential interactions becomes too large.
A 150-person company creates more than 11,000 potential communication relationships.
At that scale, alignment no longer emerges organically.
It must be designed.
That shift usually begins with hiring dedicated people who can design and run the hiring system rather than leaving recruiting as an ad-hoc founder responsibility. (Read: Your First Recruiter: A Guide for Startups and Entrepreneurs to Hiring the Right HR Talent)
Why Execution Starts Breaking Around 150 Employees
Most founders notice similar symptoms at this stage.
Projects begin slowing down.
Decisions take longer.
Teams duplicate work.
Information becomes fragmented.
None of this happens because people are less capable.
It happens because the operating system of the company has not evolved.
Startups initially run on:
- proximity
- informal communication
- founder oversight
But those mechanisms stop scaling.
The Founder Coordination Trap
In early stages, founders often act as the central alignment point.
They know everyone.
They understand every project.
They resolve conflicts quickly.
But beyond a certain size, this model becomes a bottleneck.
When founders remain the coordination hub:
- decisions escalate upward
- teams wait for approval
- leaders lose visibility into priorities
- execution slows across the organization
Scaling beyond 150 employees requires removing founders as the primary alignment mechanism.
At this stage, founders often experience another shift — hiring and coordination can no longer rely on their direct involvement without creating bottlenecks. (Read: Why Founders Burn Out on Hiring Before the Team Ever Scales)
Why Hiring More People Doesn’t Solve the Problem
When coordination slows, companies often respond by hiring.
More project managers.
More operations people.
More team leads.
But adding headcount does not solve structural problems.
In many startups, execution slows not because hiring is too slow, but because ownership and authority structures were never designed to scale as the team grew. (Read: Why Hiring Faster Won’t Fix Your Execution)
In fact, it often increases complexity.
Every new hire introduces:
- new communication paths
- new decision boundaries
- new dependencies
If ownership and decision authority are unclear, coordination cost grows faster than capacity.
Which means execution slows — even while the company grows.
What Actually Allows Startups to Scale Beyond 150 People
Companies that move past the Dunbar wall successfully do one thing differently.
They also begin formalizing leadership structures and people operations rather than relying solely on founder oversight. (Read: When to Use Fractional HR vs. Hiring a Full-Time CHRO: A Growth Guide for Startups)
They design systems.
These systems replace informal coordination with structured alignment mechanisms.
That usually includes:
Clear decision ownership
Every major initiative must have explicit ownership.
Teams must know who decides, not just who participates.
Defined role boundaries
When roles overlap or responsibilities remain vague, coordination friction multiplies.
When teams grow, unclear role boundaries across departments quickly create coordination friction and slow decision-making. (Read: Role Clarity by Team: Where Execution Breaks)
Clear role architecture reduces unnecessary communication.
Structured communication layers
Companies often introduce:
- team-level planning rituals
- leadership alignment forums
- company-wide updates
These create predictable information flow.
Leadership responsibility for alignment
Instead of founders coordinating everything, alignment becomes the responsibility of team leaders and department heads.
This distributes decision authority across the organization.
Culture Alone Cannot Solve the Dunbar Wall
Many companies attempt to solve scaling challenges through culture initiatives.
They introduce:
- team rituals
- social events
- cross-team gatherings
These can strengthen relationships.
But they do not replace operating systems.
Execution improves only when the company defines:
- decision authority
- ownership boundaries
- escalation rules
- communication structure
Culture supports these systems.
It does not replace them.
At this stage, startups usually need more than culture rituals — they need the right people functions, operating support, and organizational structure to keep execution from slowing down. (Read: What HR Services Do Startups Actually Need?)
The Real Shift After 150 Employees
Before 150 employees, alignment comes from relationships.
After 150 employees, alignment must come from systems.
This transition is often uncomfortable for founders.
It means letting go of:
- direct involvement in every decision
- personal relationships with every employee
- informal communication patterns
But companies that successfully scale accept this shift.
They design organizations that can operate without constant founder coordination.
FAQ
What is the Dunbar number in startups?
The Dunbar number refers to the idea that humans can maintain stable relationships with roughly 150 people. In organizations, this often marks the point where informal communication stops scaling effectively.
Why do startups slow down after reaching 150 employees?
Execution slows because informal coordination breaks down. Without clear decision ownership and communication systems, teams struggle to stay aligned.
At this stage, hiring and team design stop being a pipeline problem and become an infrastructure problem — because every new role affects how decisions, ownership, and execution flow across the organization. (Read: Hiring as Infrastructure: Why Talent Acquisition Must Be Designed for Scale)
Can culture solve scaling challenges?
Culture helps reinforce shared values and behavior, but it cannot replace operational systems such as decision ownership, role clarity, and structured communication.
How do companies scale beyond the Dunbar wall?
Successful companies introduce clear ownership structures, leadership accountability for alignment, and communication systems that allow teams to operate independently.
Final Thought
Scaling a startup is not just about hiring more people.
It is about redesigning how the organization operates.
The systems that worked for a 20-person team will not work for a 150-person company.
And the founders who recognize this early avoid the trap many startups fall into:
Growing headcount faster than execution capability.
If you want, the next step we should do is very important for this article:
Listen to our Podcast Episode about this topic
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If you want to sanity-check which model fits your current stage — and where execution is actually breaking — we can walk through it together.
About the author
Olga Fedoseeva is the Founder of UnitiQ, a global HR executive, and a talent acquisition and people strategy leader with 20+ years of experience across EMEA, the US, and APAC. She has personally hired 1,500+ employees, led people strategy for organisations scaling from 30 to 700+ employees, and writes about hiring systems, execution risk, and people infrastructure in growth-stage startups.
