Full-Stack Ghostwriter & AI Engineer
I install the content and email layer that reduces CAC, compounds founder authority, and turns cold signups into activated revenue. Built specifically for Series A B2B AI SaaS, with the AI engineering layer to scale it when you're ready.
Currently accepting 5 new full-stack engagements per quarter.
Book Your Free GTM Motion Audit →
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02 : Your Moat Against Soaring CAC
Your CAC is climbing every quarter, and the channels that worked at $1M ARR are breaking at $5M. Every quarter without a content layer compounds the wrong things, creating three structural leaks:
Every week without a systematic content layer is another week your competitors compound authority while your CAC compounds cost.
Your post-signup email flow was written by a developer six months ago and is silently bleeding trial-to-paid conversion every day it runs.
Outbound is consuming SDR headcount instead of running on infrastructure, capping your pipeline at whatever your team can manually dial.
Six months from now, your next round depends on a CAC chart pointing the wrong way and a category narrative that doesn't justify the multiple. You pitch investors on product features while your competitors pitch them on distribution. And in the AI era, distribution compounds while code depreciates. You answer investor questions about why your pipeline efficiency is below the cohort median, and you don't have a structural answer.
Your founder brand is your moat against soaring CAC.
Full-Stack Ghostwriting installs the content layer that turns your founder voice into category authority. The Activation Engine converts cold signups into activated, paying users. The AI Engineering Stack scales content, outbound, and onboarding without scaling headcount. One operator builds all three, voice-matched end-to-end.
Inbound that reduces CAC. Founder authority that compounds against ad spend. Activation rates that justify the next round's unit economics. Outbound that runs without an SDR team. Onboarding that signals premium operation from the first click.
The next round doesn't price on technology lead. It prices on category dominance you already own. Six months from now, you're not defending your CAC chart; you're showing investors a brand that compounds against the cost-of-acquisition curve your competitors are still climbing.
That's what I install.
03 : The Method
Three operations sit underneath every engagement I run. They compound when you do them in this order, and they don't work when you skip ahead.
01 : Capture
What can't be automated gets captured first.
Founder voice. Category positioning. ICP avatar. The frameworks and idiomatic patterns that make your thinking yours. These get encoded into prompts, exemplars, brand bibles, and content frameworks before any system gets built. Skip this step and you automate generic noise.
02 : Multiply
Captured IP scales across formats, channels, and customer touchpoints.
One source piece becomes twelve platform-native outputs. One founder thought becomes a carousel, a thread, an educational email lesson, a sales objection handler, an onboarding sequence. The AI doesn't write the content; it multiplies the captured IP. Same voice, every surface.
03 : Compound
Multiplied IP compounds into category authority and a moat against CAC.
Brand equity that reduces paid acquisition cost over time. Authority that turns discovery calls into formalities. Onboarding that signals premium operation before the writing starts. The compounding is the moat. Brand compounds. Hype decays. IP is the business model; everything else is distribution.
04 : Services
Ghostwriting lays the foundation. The AI-Native Architecture scales it. The reverse order doesn't work; automation without captured IP just produces faster noise. Every engagement starts with the Strategy Layer and graduates to the Scale Layer once the foundation is solid.
Track 1 : Strategy Layer
The content layer that captures founder voice and turns it into category authority. Hand-built, voice-matched from interview transcripts, mapped to your sales funnel.
01
X + LinkedIn Ghostwriting: 1 article, 2 carousels, and 5 posts per week on LinkedIn; 1 article, 2 threads, and 10 tweets per week on X. Voice-matched from interview transcripts.
From $3,000/month
See how it works →02
1-day welcome + 5-day education + 3-day acceleration + 1-day objection + landing page + automations + analytics. Lifts opt-in from 1-5% to 30-50%+ and increases trial-to-paid conversion within six weeks.
$5,000 one-time
See how it works →03
Newsletter ghostwriting engagement. Weekly long-form Substack newsletter + weekly Kit check-in email + 10 Substack Notes per week.
From $3,000/month
See how it works →Track 2 : Scale Layer
The AI systems that scale what the Ghostwriting built. The prompts driving the automation were written by a trained ghostwriter, which is why it captures the best of you rather than the average of everybody.
04
12-platform AI content engine. One source piece becomes platform-native outputs across LinkedIn, X, YouTube, Substack, Instagram, and more.
From $10,000
See how it works →05
LLM discovery infrastructure. Measure and improve your Share of Voice across ChatGPT, Claude, Gemini, and Perplexity. Tracks the searches your buyers actually run.
From $10,000
See how it works →06
AI outbound system that replaces your first SDR hires. Signal-based sourcing, AI-written first lines, multi-channel sequencing, CRM sync.
From $10,000
See how it works →05 : The Deliverable Stack
Every full engagement combines a Ghostwriting engagement with one or more AI-Native OS builds. Here is the complete architecture.
The Narrative Engine : Category & IP Architecture
Deep-dive audit of your current acquisition channels and post-signup flow to identify where ARR is leaking.
60-90 minute deep-dive interviews to capture your technical viewpoints, contrarian takes, and category positioning.
Reverse-engineering your exact target audience to align messaging with the right buyer committee and pricing tier.
Structuring your core thesis into a narrative that positions you as the category leader, not a commoditized AI wrapper.
Strategic mapping of your competitors' claims and the exact messaging required to dismantle them in the feed.
Preparing and structuring your manual frameworks and historical content to feed the AI Scale Layer.
The Authority Engine : Founder-Led Social & Acquisition
A tailored publishing rhythm designed to maximize executive presence without overloading your calendar.
1 article, 2 comprehensive carousels, and 5 posts per week to turn your technical IP into compounding inbound pipeline.
1 article and 2 threads per week, plus 2 daily Tweets, designed to capture the developer and tech-founder audience where AI narratives break first.
Frictionless repurposing of top-performing IP into Substack's high-signal Notes network.
Coordinated drop sequences and engagement flywheels to maximize subscriber capture during asset launches.
End-of-month strategic review to double-down on the data-backed winners driving actual ARR.
The Retention Engine : Owned-Media & Email Nurture
High-value technical assets, data reports, and frameworks utilized to capture high-intent enterprise leads.
Dynamic email logic that adapts based on user engagement and in-app product usage signals.
800-1,200 word weekly technical deep-dives hosted on Substack to command VC and enterprise respect.
Highly calibrated, intent-driven weekly emails designed to move intellectual buy-in toward booked discovery calls.
Automated funnels directing highly qualified users to your Slack or Skool communities for setter-closer triage.
Targeted check-in sequences designed to re-engage dormant users and proactively defend Net Retention Rate.
The Activation Engine : Post-Signup Pipeline (Pilot Build)
Strategic mapping of the critical path a user must take to reach your software's Aha moment.
The core educational email drip that converts cold trial signups into daily, sticky users.
Post-education sequence focusing on ROI, security compliance, and integration ease to move users to paid tiers.
Targeted email assets addressing the six core technical and financial objections preventing conversion.
Personal-story fragments delivered to subscribers who choose to skip ahead without slowing the standard drip.
Dedicated EEC landing page architecture. Hook, teaser visual, objection targeting, bio, days-1-5 preview.
Complete marketing automation configuration and routing for Product-Qualified Leads.
The Thought Architecture: Proprietary Knowledge Graph
A centralized, RAG-indexed vault storing every SOP, proposal, brand guideline, and past post.
Per-client and per-founder voice profiles structured for instant, mathematically precise retrieval by AI models.
Architecture that surfaces the exact brand context at the start of every generation and feeds the session back into memory.
The ability to drive your entire content and outbound engine directly from your native Claude chat window.
Zero-retention API routing, GDPR-compliant infrastructure, and EU data residency for proprietary IP.
The Distribution Architecture : Omnichannel Scale
A database of proven openers tagged by platform and pillar, feeding the AI generation engine with approved IP.
AI architecture that dynamically converts one core thesis into platform-native formats across 12 distinct networks.
Automated creation of carousels and data visualizations constrained strictly by your brand design tokens.
Centralized staging area to review, edit, or regenerate every AI draft before it publishes.
One centralized scheduling rail connecting all your social accounts without tab-switching.
Automated tracking and transcription of competitor content to inform your counter-narratives.
The Visibility Architecture : LLM Discovery Scale
Automated infrastructure that continuously prompts ChatGPT, Claude, and Perplexity to measure your brand's Share of Voice.
Aggregate metrics tracking your average position, mention rate, and visibility against tracked category competitors.
Per-response analysis to detect if AIs are hallucinating facts about your product or asking for clarification.
Algorithmic surfacing of the exact prompts where competitors are recommended over you.
Automated generation of hundreds of realistic buyer queries spanning awareness, consideration, and recommendation stages.
One-click generation of the exact articles and briefs required to close the AI-surfaced visibility gaps.
Deep-dive scans to ensure your site structure is readable and extractable by LLM scraping bots.
The Outbound Architecture : Autonomous Outbound Scale
Outbound infrastructure that monitors target accounts for buying signals such as hiring, funding, and tech stack changes.
Dynamic targeting parameters that reverse-engineer where specific decision-makers live online.
Multi-source lead enrichment routed securely and cost-effectively through your existing Claude infrastructure.
Batch-reviewable outbound openers built from real, scraped prospect research rather than generic templates.
Warmed-up secondary domains ensuring your primary SaaS domain is protected from spam flags.
Multi-channel sequencing with logic that instantly halts the drip the moment a prospect replies.
Automated routing of positive replies directly into your sales pipeline CRM for human-led closing.
06 : The Investment
The Strategy Layer captures and ships your IP. The Scale Layer multiplies it. Either bundle stands alone. Both together is the full system.
Strategy Layer
6-Month Full-Stack Strategic Ghostwriting Engagement
$30,000
$25,000
The Authority Engine + The Retention Engine run as a Full-Stack Strategic Ghostwriting Engagement. Includes The Narrative Engine. Items 01 through 18 of the Deliverable Stack. Six months of compounding founder authority.
BOOK A 30-MIN AUDIT →Scale Layer
3 AI Systems + Proprietary Knowledge Graph
$30,000
$25,000
The Distribution Architecture + The Visibility Architecture + The Outbound Architecture, all on The Thought Architecture foundation. Items 26 through 50 of the Deliverable Stack. All systems voice-matched end-to-end.
BOOK A 30-MIN AUDIT →The Activation Engine (19-25) is deployed as a standalone $5,000 prerequisite pilot. The Narrative Engine and The Thought Architecture are bundled in with their respective layers.
07 : Start Here
The same methodology I install for clients. Sample the engine before you commit.
The Activation Engine
10-Day Educational Email Course Stack
Illustrative dashboard. Live deployment results vary by ICP, ACV, and traffic source.
Start With The Activation Engine
The Activation Engine is the pilot deployment for a reason. It's the system that converts your existing trial signups into activated, paying users without touching your product, without hiring anyone, and without scaling your founder workload.
Four weeks. ~1 hour per week of your time. $5,000 one-time. Lifts opt-in conversion from 1-2% to 30-50% and increases trial-to-paid conversion within six weeks of launch. Built specifically for Series A B2B AI SaaS post-signup activation.
If we end the engagement here, your activation rate alone covers the build cost inside the first month.
Activation Engine Demo →08 : Track Record
A ghostwriter who also builds AI systems has to prove three things: that they can move revenue, that the writing captures audiences at scale, and that the engineering is robust. Here's one named client endorsement for each.
Revenue
"Sebastian is a sage at his craft, just as I am at mine. He is always contributing with insight in the Sales Rocket Mastermind."
Doru Pelivan
Founder
eduKIWI (8-figure EdTech)
Growth
"Sebastian captured exactly the thinking style and writing voice I was looking for. My Udemy courses increased ratings from 4.6 to 4.8."
Jonas Schmedtmann
Instructor
Udemy
Engineering
"Sebastian is obviously a highly skilled and knowledgeable web developer. He delivered one of our biggest projects in just the right amount of time."
Martin Aranovitch
Manager
WPMU Dev
09 : Deployment Process
How I extract your IP, validate the math, and build the systems to multiply it.
Week 1 · Free Mutual Evaluation
I audit your current acquisition channels, content output, and post-signup activation flows. Through a 90-minute technical deep-dive, I extract your category thesis, contrarian takes, and technical POV. You leave with a precise architectural teardown of your GTM motion and a blueprint for your voice, whether we move forward or not.
Month 1 · $5,000 Build
Instead of long-term engagement promises, I start with activation. I build your 10-day educational email architecture that captures trial users and converts them to paid. The landing page goes live, automation gets wired, baseline metrics get established. If the math works here and the conversion lift is real, we move to the next phase.
Months 2-7 · $5,000/month or $25,000 upfront for 6 months
Automation amplifies whatever you point it at. Point it at unvalidated positioning and you'll burn your TAM ten times faster. For six months, I manually run your Authority Engine and Retention Engine. I analyze metrics weekly, cut the losers, double down on the winners. We mathematically prove your voice, your ICP, and your content pillars. This manual phase is what builds the proprietary data the AI Scale Layer needs to work.
Month 8 · $25,000 for the full stack or $10,000/system
With your IP validated, we transition to scale. I build your Proprietary Knowledge Graph, indexing all the winning frameworks we just created, and install the AI-Native Operating Systems. The Outbound Architecture automates your outbound. The Distribution Architecture multiplies your content. The Visibility Architecture secures your LLM market share. Three standalone systems, unified into one architecture your company owns forever.
Month 9+ · $5,000/month or $25,000 upfront for 6 months
You own the machine. I run it for you. Your monthly investment stays the same as the manual phase, but your output scales by an order of magnitude. I act as your human-in-the-loop: reviewing AI-generated content before it publishes, triaging inbound replies from the outbound engine, refining prompts, maintaining APIs. You get the output of a full growth team, managed by the single operator who built the system.
10 : Your Ghostwriter
I partner with Series A B2B SaaS founders who are tired of handing their API docs and brand voice over to marketing interns.
Most growth operators live in one of two silos. They either:
a. Write content but don't understand your codebase, or
b. Build AI automations but write copy that sounds like a generic LLM.
Neither one knows what makes a cold enterprise lead book a demo. They've never been on the other side of the sale.
I have.
This infrastructure exists because I couldn't find a single provider who combined high-ticket sales psychology with production-grade AI engineering, and who could ghostwrite in a voice indistinguishable from a technical founder's.
So I built it myself, drawing on three distinct disciplines.
Tech — Technical Translation at Scale
I started as a web developer (JavaScript, React, Next.js), designing and building 25 production websites for clients.
I then spent eight years as a Customer Success Manager supporting over 2 million programming students across Jonas Schmedtmann's top-rated tech courses.
I wrote and managed 40,000+ responses, explaining complex code to learners while maintaining a 4.8/5 star rating.
I learned how to teach complex ideas cleanly, and how to scale that precision across tens of thousands of interactions.
I still remember the day Jonas picked me as his Teaching Assistant seven years ago, out of his 200k+ students at the time. The joy of recognition and getting paid to do what I love: help people with writing.
Only a couple of years ago did I discover that I'd been training to ghostwrite on technical topics all these years.
"I trust in Sebastian's great work ethic and capacity. Communicating with him is always straightforward."
Andrew Radulescu · CEO at Tribus Technologies
Strategy — High-Ticket B2B Psychology
Before I built AI systems, I was a High-Ticket Closer for Romania's largest 8-figure EdTech operation, eduKIWI.
Sitting on the other end of hundreds of calls, closing $5,000+ deals on video calls, taught me exactly what content makes a prospect say yes before the demo, and what objections kill the deal.
Part of the team that generated $12M+ in attributed revenue, the setter-closer dynamics I learned now inform every outbound sequence and activation drip I architect.
I still remember the rush of my first sale, when the 15% commission for a $5,000+ sale came through. The same rush my clients experience when an investor signs them $1M+, saying "I really enjoyed the LinkedIn post you wrote last week."
"Sebastian has achieved some of the best show-up rates on my sales team. A very professional voice."
Roxana Borz · 7-figure Coach at Manifestation Academy
Copy — Voice-Matched AI Systems
I don't outsource the tech, and I don't outsource the copy.
Long behind me are the days of simple Make.com and n8n automations. Today, I build production-grade custom SaaS using Claude Code, Codex, and Antigravity that automate outbound and content with agentic AI workflows.
Deployed via Vercel. My GitHub is out there for all to see.
I trained under Christian Davis, who wrote for Alex Hormozi, and Nicolas Cole's Premium Ghostwriting Academy.
Because I'm a trained ghostwriter building the automation, the prompts driving your system capture the best of your unique voice, not the average of everyone else's.
"I have ghostwritten for over 100 clients. You will never see their names here. Discretion is the product."
100+ Founders & Operators · Protected under NDA
When I say I'm a Full-Stack Ghostwriter and AI-Native Engineer, I mean I'm the one inside your infrastructure handling the tech, the strategy, and the copy.
11 : Frequently Asked Questions
Voice capture is the first deliverable, not a side effect.
It starts with a 60-90 minute technical deep-dive where I extract not just what you think, but how you think: the rhythms, the analogies, the specific words you reach for under pressure. From that transcript, I build a voice document with your idioms, your pet phrases, your structural patterns.
Every piece of content that ships afterward, whether I write it by hand or the AI systems generate it, is graded against that document before publication. Most founders are surprised by how accurately their voice lands in week one. The rare drift cases get fixed inside a single revision round.
No.
Voice-matching is the craft. The thinking has to be yours, the experiences yours, the contrarian takes yours; I'm simply the operator translating that IP into platform-native content at a cadence you couldn't sustain alone.
I've ghostwritten for 100+ founders and operators across SaaS, EdTech, and high-ticket coaching. None of them have ever had a reader call out the work as not theirs.
Jonas Schmedtmann's testimony anchors this: 'exactly the thinking style and writing voice I was looking for.' That's the bar.
No.
And that's exactly why you want to hire me.
This is the Ghostwriter's Paradox. I've ghostwritten for over 100 founders, operators, and executives. You will never see their names on this site.
In this industry, discretion is the product. The founders I work with are raising capital, negotiating enterprise contracts, and building category dominance. They're paying for an architecture that makes their voice compounding and permanent. If I leveraged their names to sell my services, I'd be violating the exact trust they hired me for.
My technical track record is public. My strategic track record is public. My personal writings are out there for all to see.
But the ghostwriting portfolio stays locked behind NDAs. The only way to test the craft is to commission a piece. The Activation Engine is the lowest-stakes way in.
Full transparency: you totally could.
But:
A generalist freelancer is a management tax. They can't read your API docs, build AI infrastructure, or operate at the technical depth Series A SaaS demands. You end up handholding them just to get generic noise.
An agency is a coordination tax. They assign you five different people. Your voice drifts because it's split across a team, the tech layer doesn't talk to the content layer, and the senior partners who pitched you often delegate the actual work to juniors.
I am a single, full-stack operator. Strategist, copywriter, and engineer in one, amplified with AI used right. You get the output of an agency without the 10-hour-a-week coordination tax, and the technical depth a freelancer can't match. I never delegate your writing, and your voice stays pristine because it's never split.
Then the Activation Engine is where we start.
If your list is under 5,000 signups, what you need first is a working education-to-activation system that captures the value of every signup you DO get. The Activation Engine is the right starting point at any list size; it works at 500 trial signups a month and at 50,000.
For founders with no LinkedIn presence yet, I build the Authority Engine in parallel with the Retention Engine during months 2-7 of the engagement, so by the time audience growth starts compounding, both layers are running.
Results vary by ARR, list size, and channel mix, but here's the math that matters:
The Activation Engine typically lifts opt-in conversion from 1-5% to 30-50% within 6 weeks of launch.
This intensive educational sequence directly accelerates your trial-to-paid conversion.
The Authority Engine delivers an asset library of over 500 pieces of IP you own forever.
This content compounds slowly for the first 60-90 days, then starts generating inbound that structurally reduces your CAC against paid channels.
The Retention Engine defends your Net Retention Rate (NRR) and accelerates enterprise pipeline velocity.
It captures the 95% of your market that isn't ready to buy on day one, systematically nurturing dormant subscribers until they cross the threshold into booked discovery calls.
For a Series A company at $1M-$20M ARR, the Activation Engine easily pays for itself within the first 30 days of activation lift alone.
One 60-90 minute kickoff call.
Then 30-60 minutes per week: usually a content interview, review pass, or strategy check-in.
If you're slammed with board meetings or product launches, we can run async via Loom and voice notes.
A free 30-minute call. No pitch.
I audit your current content and email infrastructure end-to-end, identify the structural leak costing you the most ARR, and show you what fixing it would look like.
If we're a fit, I recommend a starting point and we talk numbers. If we're not, I tell you exactly what to do on your own.
Either way, you leave with a diagnosis you can act on this week.
12 : Book The Audit
Every quarter without a real content layer is another quarter of paid CAC climbing, founder time leaking, and signups going cold instead of activated. Let's diagnose what an Activation Engine would do for your specific GTM stack.
Book Your Free GTM Motion Audit →30 minutes. No pitch. Just a clear-eyed look at the structural leak in your current funnel.