Fractional People Leadership & Advisory

Growth doesn't create organizational problems.
It reveals them.

I help founders and executives identify and solve the people, structure, and communication challenges that emerge as organizations grow.

The result: an organization that can actually keep up with the business you're building.

Why Vivarium

An intentionally designed ecosystem.

After fifteen years inside scaling organizations across multiple industries, the pattern is always the same: the companies that fall apart don't fail because of the market, the product, or the funding. They fail because the people side never got the same intentional design as everything else.

Strong companies are living systems shaped by leadership, structure, communication, incentives, and culture. Every person, role, and process affects the health of the whole.

We're not a family. We're an ecosystem. And healthy ecosystems require intentional design.

About

Hi, I'm Nasim Assadi.
Founder of Vivarium.

I've built people functions from the ground up and scaled them through hypergrowth. The 0 to 400 stage, where scrappy stops working and structure has to take over, is where I do my best work.

Based in Los Angeles, I work with founder-led companies across the US and internationally.

What I watch for

The patterns I help founders avoid.

Most organizational problems aren't surprises. They're patterns. Here's where I'm looking from day one.

Unclear organizational structure

I redraw reporting lines before they harden around the wrong people.

Executive misalignment

I bring the alignment work into the open before it quietly derails everything else.

Reactive hiring practices

I install the discipline that protects the bar before the panic sets in.

Breakdowns in communication & accountability

I rebuild the operating cadence that keeps the team in sync and decisions from getting made twice.

Weak management foundations

I install the basics that make management work before the gaps become crises.

Compensation & performance inconsistencies

I build a defensible framework early, before resentment quietly starts to build.

How I can help

Senior, embedded, and refreshingly unflashy.

Most clients start with a single focused engagement and grow into a deeper, ongoing partnership.

Fractional people leadership

Senior HR embedded in your organization: strategy and execution, without the full-time cost.

Strategic HR & organizational partnership

A thought partner for the people decisions that don't fit neatly into any playbook.

Organizational design & transformation

Clear structure, right roles, reporting lines that work. Built before the wrong ones harden.

Executive coaching & employee relations

Direct support for leaders navigating hard conversations, performance, and transitions.

Talent strategy & executive hiring

Hiring frameworks and executive search built around culture, fit, and long-term performance.

People operations & communication design

The infrastructure that makes teams work: operating cadence, comp frameworks, onboarding, and the basics that scale.

Case studies

Everyone knew. Nobody said anything. → Loyalty is not a job description. → You can't hire your way out of chaos. → The founder was the culture problem. →

Get in touch

Let's talk.

No forms. If you're building something and need a thought partner, reach out directly.

Email me →

Email hello@vivarium.co

Based Los Angeles · Remote across the US and internationally

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Growth doesn't create organizational problems.It reveals them.