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Alex Marchetti
Growth Editor at Signal · Brooklyn, NY
I spent five years as a growth practitioner before I started writing about it. The first startup I joined out of college, a meal-kit company in Chicago, taught me what "product-market fit" feels like when you don't have it. We burned through $4M of seed funding testing referral loops that never compounded. I learned more from that failure than from anything I've read since.
The second company was a B2B SaaS tool for sales teams. Series A, decent traction, bad unit economics. I ran paid acquisition and learned that you can buy growth, but you can't buy retention. We hit $2M ARR and then flatlined for 18 months. The board replaced the CEO. I left.
The one that worked was a developer tools company (I won't name it because I signed things) where I led growth from $800K to $11M ARR over two years. The entire playbook was content and community. Zero paid spend. That experience broke my brain in a good way. I realized most growth advice is written by people who've never actually run a channel, and most case studies leave out the parts that matter.
I started writing teardowns on Substack in 2023. Signal picked up one of my Notion breakdowns in early 2024, and I joined as Growth Editor six months later. My job is to write the articles I wished existed when I was a practitioner: the ones with actual numbers, actual trade-offs, and actual mistakes.
I live in Brooklyn with my partner and a cat named CAC. (She was expensive to acquire and has questionable lifetime value.)
Articles by Alex Marchetti (25)
How OpenClaw Hit 250K GitHub Stars in 60 Days — A Growth Marketing BreakdownThe open-source AI agent framework didn't just grow fast. It rewrote the playbook on community-led viral distribution. Here's every mechanic that made · Feb 24, 2026The World Cup Will Be the Biggest Growth Event in Prediction Market HistoryPolymarket hit 688K monthly active users and $7B in February volume \u2014 before a single World Cup match. Here\u2019s why 64 games across 45 days wi · Mar 1, 2026The Claude Code Moat: How $1B in Revenue Turned a Developer Tool Into Anthropic's Entire Distribution StrategyClaude Code generated $1 billion in revenue within 6 months of launch. It now accounts for a massive share of Anthropic's $19B ARR. This isn't a codin · Nov 14, 2025What Polymarket Got Right About Growth That Most AI Products Still Get WrongThey didn't build a referral program. They built a format that spread itself. A product, growth, and AI breakdown of the most interesting company nobo · Sep 12, 2025Kalshi Bet $50M on Legal Prediction Markets. The Election Proved They Were Right.The CFTC tried to shut them down. A federal court saved them. Then the 2024 election made Kalshi the most accurate forecaster in America — and the mos · Feb 16, 2026The Rise of the One-Person, $10M ARR CompanyA solo founder sold his 6-month-old company for $80 million. Another hit $1M ARR in 17 days. AI coding tools, no-code platforms, and API infrastructur · Mar 9, 2026Your Onboarding Is 6 Steps Too Long: The Data Behind Sub-60-Second Activation3-step tours complete at 72%. 7-step tours complete at 16%. The average SaaS product loses 40-60% of signups in the first five minutes. A data-driven · Mar 9, 2026When PLG Hits a Ceiling: The Messy Shift to Enterprise Sales at $20M ARRFigma waited too long. Slack almost didn't survive it. Airtable is still figuring it out. Inside the most dangerous transition in SaaS — and the $25M · Mar 9, 2026AI Made the Solo Founder the Default — And Co-Founders Might Be the New Technical DebtSolo-founded startups surged from 23.7% to 36.3% of all new companies in six years. Solo founders now capture 52.3% of successful exits and retain 75% · Mar 9, 2026Temu Spent $3B on Ads Last Year. It's the Most Aggressive Growth Play Since Uber — And the Unit Economics Are Worse.530 million MAU. $70.8 billion in GMV. Meta's single largest advertiser. Negative unit economics on most orders. A supply chain stretching from Guangz · Mar 9, 2026LinkedIn Quietly Became the Most Profitable AI Product at Microsoft — And Nobody NoticedWhile the entire industry fixates on Copilot's sluggish enterprise rollout, LinkedIn has been printing money with AI features that 1 billion professio · Mar 10, 2026Reverse Flywheels: When Your Growth Loop Starts Spinning BackwardsGrowth flywheels are celebrated when they compound positively. Nobody talks about what happens when they reverse — when more users make the product wo · Mar 15, 2026The 85% Agentic Gap: Why Most Enterprises Will Fail the Transition to Autonomous AI85% of enterprises want to go agentic within three years. 76% admit their operations can't support it. Only 6% have fully implemented agentic AI. The · Mar 17, 2026The AI Browser War: Arc Died, Dia Launched, and the Browser Might Be the Last Unclaimed AI Distribution SurfaceThe Browser Company killed its cult-favorite product to bet everything on AI. Opera, Brave, and a dozen startups are racing to the same conclusion: th · Mar 25, 2026Revolut Hit 50 Million Users Without Ever Winning a Market. That's the Entire Strategy.Every fintech playbook says pick a market and dominate it. Revolut did the opposite — it launched in 38 countries, built 47 products, and treated dept · Mar 25, 2026The 2026 SaaS Benchmarks Report: ARR, NRR, CAC, and 14 Metrics That Actually MatterEvery SaaS board deck uses the same metrics. Most of them are calculated wrong, benchmarked against outdated cohorts, or missing the numbers that actu · Apr 9, 2026PLG Is Dead, Sales-Led Is Broken — The Hybrid GTM Playbook for 2026Product-led growth hit a ceiling at $20M ARR. Sales-led growth can't justify the CAC at sub-$50K ACV. The companies actually scaling in 2026 — Notion, · Apr 9, 2026The AI SEO Apocalypse: Zero-Click Search Killed 40% of Content Marketing OvernightGoogle AI Overviews now appear on 47% of all search queries. Organic click-through rates have collapsed across every content category. The data from 1 · Apr 9, 2026llms.txt Is the New robots.txt: What AI Crawlers Actually Do With ItThe llms.txt proposal exploded across hacker forums and SEO Twitter in 2025. By mid-2026, every serious publisher has one. The catch: most of them are · May 20, 2026The SaaS AEO Playbook: How Linear, Notion, and Cursor Are Winning AI Search Citations in 2026SaaS products compete in head-term categories where AI assistants default to a small handful of names. The companies winning those defaults treat comp · May 21, 2026Pet Care AEO: Vet Clinics, Pet Food Brands, and the New Pet-Owner AI FunnelHubSpot's 2017 pillar-cluster model went out of fashion when Google shifted to entity-based ranking. Then LLM retrieval changed the math again — and d · May 25, 2026When AI Search Gets Your Brand Wrong: Misinformation Defense and Brand Safety in 2026Gartner Magic Quadrants, Forrester Waves, and IDC MarketScapes are disproportionately cited by ChatGPT and Perplexity — making analyst relations the m · May 25, 2026Storm-Chaser Roofers Are Winning AI Search. Local Roofers Need This Playbook.73 million baby boomers are aging into assisted living decisions, and their adult children — the sandwich generation making the calls — are now starti · May 26, 2026The Activation Benchmark That Broke When AI ArrivedChartMogul data shows AI-native companies averaging 40% GRR vs. 82% for traditional B2B SaaS. The fix requires a completely different retention playbo · May 28, 2026OpenAI Codex's White-Collar Pivot: When 20% of Users Aren't DevelopersOpenAI's advertising platform has launched to 1,000+ brands with CPMs at $25–60 and reported 2x conversion rates over traditional search—here's how to · Jun 5, 2026