Commercial support

Fractional Head of Sales or Commercial Consultant?

A fractional Head of Sales makes sense when a commercial function or team already exists and someone needs to take temporary responsibility for it. A GTM or commercial consultant makes more sense when a specific commercial problem has to be solved first.

A fractional leader owns an ongoing commercial function. A consultant solves a defined commercial problem. Choose on that basis, not on seniority.

The difference isn't just seniority. It's ownership. The right commercial support depends on what is missing: leadership, execution, or commercial foundations.

Written by Merel Roest, Founder & GTM Consultant at Blackbird GTM.

You may not need a Head of Sales

Hiring commercial leadership is often the first reflex when revenue feels unpredictable. Sometimes it's right. Often it postpones the real question: does the company know how it sells, and can that be repeated by someone else?

Leadership can run a motion. It cannot replace one that was never defined. If ICP, qualification and sales process are still open questions, an experienced leader spends the first months doing consulting work anyway, at leadership rates and with a team watching.

Leadership manages a motion. It does not invent one while running it.

When does a fractional Head of Sales fit?

Usually when people are selling, but nobody is leading them.

There is already a sales team

Two or more people carry a number. Their week needs direction, priorities and someone accountable for the outcome.

Sales leadership is missing

The role exists on the org chart or in reality, but nobody is filling it. Often the founder holds it nominally without the time to run it.

Forecasting and coaching are insufficient

Deals are reviewed when they slip instead of before. Nobody sits in calls, inspects deals weekly or holds the forecast to evidence.

Hiring and team development need an owner

Onboarding, ramp, performance management and the next hires need someone who owns them over quarters, not a project.

Someone needs to take temporary commercial responsibility

A leader left, a hire is months out, or the company is between commercial phases. The function has to keep running while that gap is open.

Before you add leadership on top of a team, check whether your sales motion is ready to be repeated by someone else.

When does a GTM or commercial consultant fit?

Usually when the question isn't who manages sales, but what sales should actually be.

The ICP isn't sharp enough

Deals close, but you can't explain which companies and situations you win in, so effort spreads instead of compounding.

If that's the open question, start with the ICP stress test.

The sales motion isn't clear

How a deal is actually won, who is involved and what has to be true at each step exists in people's heads, not in a motion anyone can follow.

Messaging doesn't work

Conversations start but don't convert, because the problem you describe isn't the problem the buyer is trying to solve internally.

The sales process isn't in place

Stages describe internal activity instead of buyer progression, so nobody can see where deals leak until the quarter ends.

Founder-led sales has to become a repeatable motion

The founder still closes the important deals. What they know has to be made explicit before anyone else can carry it.

Which situation do you recognise?

We have five sales reps but no sales leader
Fractional Head of Sales. The function exists and needs an owner.
We have traction but don't know who we should really target
GTM consultant. This is a foundation question, not a leadership question.
The founder still closes every important deal
Could be either. If the motion is clear and only capacity is missing, leadership. If nobody can explain how deals are won, consulting first.
We need someone to fix the sales process
Consultant first, potentially fractional leadership later once there is a process worth managing.

Concrete situations decide this faster than definitions.

The Commercial Support Decision Check

Five questions, in this order. The first one that gives a clear answer usually decides the choice.

  1. 1

    Is there a team?

  2. 2

    Leadership gap?

  3. 3

    Foundation gap?

  4. 4

    Run or solve?

  5. 5

    Temporary or structural?

When do you need both?

The line isn't always black and white. In practice the work often starts as consulting, ICP, qualification, process, pipeline, and becomes more fractional once there is a motion and a team to own.

The reverse happens too: a fractional leader takes the function, and a specific foundation problem surfaces that needs to be solved as a project rather than managed week to week.

What matters is sequence. Ownership of a function you haven't defined is expensive. Definition without anyone to run it goes stale.

Fractional leadership is ongoing ownership. Consulting is a defined problem, a project, an intervention.

How Blackbird GTM works

Blackbird GTM works on commercial foundations and execution: ICP, messaging, qualification, sales process, pipeline and the transition out of founder-led sales, usually at B2B SaaS companies around €0-2M ARR with traction but no predictable engine yet.

If you have a functioning team and mainly need someone to lead, coach and forecast week after week, a fractional Head of Sales or interim sales manager is the better fit, and I'll say so. Blackbird GTM is not the answer to every commercial question.

Fractional versus consultant

Same seniority, different job.

Fractional Head of Sales

  • Primary role: leads the commercial function
  • Ownership: owns an ongoing function and its results
  • Time horizon: ongoing, multiple quarters
  • Team leadership: yes, direct reports
  • Forecasting: owns the forecast
  • Coaching: weekly, in deals and calls
  • Hiring: owns hiring and ramp
  • Strategy: executes and adjusts within an existing direction
  • Process design: maintains and enforces
  • Execution: through the team
  • Typical situation: a team exists, leadership is missing

GTM / commercial consultant

  • Primary role: solves a defined commercial problem
  • Ownership: owns the outcome of a scope, not the function
  • Time horizon: defined project or intervention
  • Team leadership: no, works with the team
  • Forecasting: builds the basis a forecast can rest on
  • Coaching: on method, process and deal thinking
  • Hiring: defines readiness, profile and enablement
  • Strategy: defines ICP, motion and commercial direction
  • Process design: designs and tests
  • Execution: hands-on alongside founder and team
  • Typical situation: the commercial foundation isn't in place

Both can be senior. Only one of them takes responsibility for the function itself.

Answer this before you start a search

Five questions that separate a leadership gap from a foundation gap.

  1. 01Is there already a sales team, or people selling without a function around them?
  2. 02Is the problem mainly leadership and ownership, or direction?
  3. 03Or is a commercial foundation missing first: ICP, motion, process?
  4. 04Does someone need to run a function, or solve a problem?
  5. 05Is the problem temporary, or structural?

If you'd have to define ICP, qualification and process before a new leader could lead, you have a foundation gap. Leadership will not fix it.

The Blackbird GTM view

Commercial leadership is often hired to avoid a harder question: whether the company knows how it sells.

Answer that first, honestly, and the choice between fractional leadership and consulting stops being a debate.

About the author

Merel Roest

Founder & GTM Consultant, Blackbird GTM

Merel Roest has led B2B SaaS sales as Head of Sales, built and ran a €1.7M direct sales pipeline, grew ARR by 40% and increased average contract duration by 66%. She works with founders and commercial leaders on ICP, messaging, sales process, qualification and commercial organisation.

Where to look next

Not sure what kind of commercial support you actually need?

Blackbird GTM helps you determine what is actually missing: commercial foundations, execution or leadership.