Growth thatcompounds.
30 minutes, free. No deck required.
Cristina SebeFractional growth lead. Bird, Sendcloud, Mattel.I help B2C SaaS companies figure out why users aren’t sticking, build the loops that make retention compound, and use AI to do it without a full growth team.
Built growth for teams at
- BirdConsumer app · acquisition & retention
- SendcloudB2B SaaS · growth function from scratch
- Mattel10k-piece digital launch · community
What I do
Four things, done end to end.
- 01
Growth strategy & GTM
Where your next stage of growth comes from, and the plan to get there. Positioning, channels, pricing, and a roadmap your team can actually run.
- 02
Activation → retention
Activation is the on-ramp to retention. I get users to first value fast, then turn that first win into a habit. For B2C SaaS, this is where you live or die.
- 03
Product-led & lifecycle
Growth built into the product. Onboarding, lifecycle messaging, and loops that keep users coming back. Increasingly AI-driven.
- 04
Building the growth function
I make myself replaceable on purpose. The team, the rituals, and the measurement to own growth after I leave.
How I work
The Compounding Loop
Activation is the on-ramp. Retention is where growth compounds.
Most growth work chases spikes. I build a loop instead. Every stage feeds the next, and the loop gets stronger each cycle. That is what makes growth compound. The order matters, too: activation before monetization, retention before acquisition scale.
01Acquire
New users come in through paid, organic and referrals. The fuel of the loop.
02Activate
The on-ramp: setup, aha, habit. Users hit first value fast and start coming back.
03Retain
The habit holds. This is where growth compounds.
04Monetize
Retained users convert and expand. Revenue follows the habit, and feeds the next cycle.
Growth run the way it works now.
AI compresses the growth team. One senior lead now ships what used to take five people.
I operate like a team of five
I build my own tools and agents with Claude Code. Analysis, experiments and lifecycle work ship at a pace a single hire usually can't match. Senior judgment, team-level throughput.
I close the insight-to-action gap
Everyone has dashboards. The gap is action: turning product signals into upgrade nudges, re-engagement and expansion prompts while the user is still engaged. I wire PostHog or Mixpanel to Customer.io so those interventions ship without an engineering queue.
I get you found in AI search
Buyers now discover tools through ChatGPT and Perplexity. I make you citable there. Answer-engine optimization as a real acquisition channel.
Start with a Growth Audit.
A short, paid teardown of your activation and retention, with the highest-leverage fixes ranked. Low risk, fast, and you keep the findings.
About
I’ve spent 10+ years in growth for consumer and SaaS companies. Close enough to the product to change it, close enough to marketing to sell it.
Most growth hires pick one side. I work across both. I build the system: acquisition, activation, retention, and the team to own it. Then I run it.
I’ve also founded two companies of my own, so I know what growth looks like from the founder’s chair: the runway math, the trade-offs, the speed it has to happen at.
I optimize for growth that compounds, not spikes that look good in a board deck and are gone by the next quarter.
FAQ
Questions I get.
- What is a fractional growth lead?
- A fractional growth lead owns a company’s growth part-time, strategy through execution, instead of as a full-time hire. Unlike an advisor who only recommends, a fractional lead builds the growth system and runs it: acquisition, activation, retention, and the team to own it.
- When should a B2C SaaS company hire one?
- When you have product-market fit and growth is now the constraint, but a full-time VP of Growth is too early or too expensive. The typical window is roughly seed to Series B. You need senior growth ownership now, without a six-month search.
- How is this different from a growth advisor or an agency?
- An advisor reviews your plan. An agency runs a channel. A fractional growth lead owns the number: building the whole system and being accountable for activation, retention and revenue.
- What does “AI-native” actually mean here?
- Two things. I use AI to work faster: my own tools, analysis and experiments, so a fractional lead ships like a team. And I build AI into your growth, from AI-driven activation to being found in AI search like ChatGPT and Perplexity.
- What tools do you work with?
- PostHog and Mixpanel for product analytics, Eppo for experimentation, Customer.io for behavior-triggered lifecycle messaging, and Clay for signal-based outreach. I build custom internal tools and agents with Claude Code. The stack follows the sequence, though: a PQL or outreach layer only makes sense once activation works.
- How does an engagement work?
- Most engagements run 3 days a week for 3 to 6 months. We start with a Growth Audit: a multi-day, paid teardown of your activation and retention with the highest-leverage fixes ranked. The audit starts from €1,500.
- What happens on the intro call?
- Thirty minutes. You tell me where growth is stuck, I tell you what I would look at first. If I am the right person, I will say so. If not, I will point you to who is. No deck, no pitch.
Let’s talk
Have a B2C SaaS growth problem worth solving?
Tell me where you’re stuck. If I’m the right person, I’ll say so. If I’m not, I’ll point you to who is.