Toxic Bosses Are Built by What You Tolerate

Toxic Bosses Don’t Just Happen, someone hires them and tolerates them.

Netflix’s culture deck says it clearly: “Actual values are shown by who is rewarded, promoted, or let go.”

Linkedin is full of posts explaining how to spot a toxic boss and the damage they cause: attrition, fear, politics, burnout, underperformance, and a culture where people stop telling the truth.

Engineering often has more than its share of toxic bosses because we over emphasize technical strength. Leadership is treated like a bonus skill instead of a requirement of the job.

If you’re a CTO, you’re not just reacting to toxic leadership in the org, you’re shaping the conditions around it. Harmful management patterns tend to persist when hiring signals are unclear, expectations aren’t explicit, and accountability isn’t applied consistently.

Here’s how to ensure you don’t hire them, and don’t tolerate them once they show up.

1) Define “Toxic” in behavioral terms

If your struggle to define unacceptable behavior, you’ll rationalize almost anything when delivery pressure spikes.

Write down the non-negotiable unacceptable behaviors. For example:

  • Uses fear, humiliation, or sarcasm to “drive performance”
  • Blames individuals instead of owning systems and outcomes
  • Hoards information, undermines peers, plays politics
  • Retaliates when challenged, punishes dissent
  • Consistently violates boundaries (hours, urgency, respect)
  • Creates “favorites” and scapegoats
  • Hides bad news upward, surprises the org later

If you can’t name the behaviors, you can’t screen for them. And you definitely can’t hold people accountable to them.

2) Screen for leadership, not just competence

Most interview loops overweight technical strength and experience.

Toxic bosses often look great in those dimensions.

What you actually need to test is: How do they behave when they have power, pressure, and ambiguity?

Use interview prompts that force tradeoffs:

  • “Tell me about a time a high performer was toxic. What did you do?”
  • “When was the last time you changed your mind because a junior person was right?”
  • “Describe a time your team missed. How did you talk about it upward and downward?”
  • “What feedback have you gotten more than once? What have you changed?”
  • “What do you do when you strongly disagree with Product or Sales?”

Then listen for tells:

  • Do they take responsibility or narrate blame?
  • Do they describe people with contempt?
  • Do they talk about control, compliance, and “whipping into shape”?
  • Do they show learning, or just justification?

A CTO should treat “how you talk about people” as a first-class signal.

3) Backchannel references for patterns, not stories

Ask past peers and direct reports questions like:

  • “When things were stressful, what got worse about them?”
  • “Would you put them in charge of your best people? Why or why not?”
  • “How did they respond to disagreement?”
  • “Did people volunteer to work for them again?”

You’re not looking for a single incident. You’re looking for a repeated behavior.

If multiple people describe the same sharp edges, believe them.

4) Make the first 90 days an integrity test, not a grace period

Most orgs give new leaders a runway with vague expectations. Toxic managers use that time to establish dominance and fear.

Instead, make your first 90 days explicit:

  • Required 1:1s with every direct report and key partners
  • Evidence of psychological safety and accountability
  • A clear plan for developing people, not just delivering work

And do skip-levels early.

The goal is to detect two things fast:

  1. Are people getting clearer and stronger around them?
  2. Or are people getting quieter and more cautious?

Silence is not a sign of “alignment.” It’s often a sign of fear.

5) Build a real escalation path for toxicity

If reporting a toxic boss is career-limiting, you’ve created a shield for bad behavior.

CTOs need a simple, credible path:

  • Multiple reporting channels (not just the direct manager)
  • Protection from retaliation (stated and enforced)
  • Fast investigation timelines
  • Visible consequences when behavior is real

If the org sees that “results excuse behavior,” you will get more of it.

6) Don’t reward toxicity with scope, headcount, or “importance”

This is the part most CTOs avoid, because it’s difficult.

If a manager hits deadlines but leaves a trail of attrition, you did not win. You robbed future performance for today.

Make your promotion and reward criteria explicit:

  • Talent health (retention, engagement, internal mobility)
  • Cross-functional trust
  • Quality of leaders they develop
  • How they handle conflict and accountability

Toxic bosses optimize for short-term outputs and personal control. Your system must optimize for sustainable execution.

7) Treat manager quality as a measurable system

If you’re serious, instrument it like you instrument reliability.

Track:

  • Attrition by manager
  • Internal transfer requests away from a manager
  • Skip-level sentiment trends
  • Employee relations incidents
  • Engagement deltas by team
  • Promotion velocity and performance distribution

Then review it routinely, not only when something blows up.

Toxicity isn’t a surprise event. It’s a trend line you ignored.

Reality

You don’t eliminate toxic bosses with a memo about values.

You eliminate them by building a system where they are:

  • Screened out
  • Detected early
  • Managed out

If you’re a CTO and you want a healthy culture, start here:

Make “how leaders lead” as important as “what leaders deliver.”

Because your org will tolerate exactly what you tolerate.