▶Product-led growth (PLG) vs sales-led growth (SLG) — which should a startup pursue?
PLG (free tier → self-serve upgrade, e.g., Figma, Slack) suits B2B SaaS with low friction/quick time-to-value. SLG (sales team closes deals) suits high-ACV deals ($10k+) where a buyer needs custom setup. Hybrid is now standard: PLG motion for adoption, SLG team for enterprise upsells. For a startup: start PLG (cheaper, faster), add SLG when you hit $1M ARR with 20%+ of users coming from inbound trials. Test both; your data trumps playbook-following.
▶What is 'viral coefficient' and how do I calculate it?
Viral coefficient = average new users invited per user × % who accept invite. If each paying customer invites 2 friends and 50% convert, viral coefficient = 1.0 (self-sustaining). >1.0 = exponential growth loops (Dropbox hit 2.5–doubled users every ~5 days). <1.0 = loops need paid CAC to sustain. Calculation: multiply-and-test. Dropbox measured: users got 500MB free for each referred friend → 35% of signups came from referrals → k ≈ 0.25–0.35. Increase k by: lowering activation friction (easier to invite), increasing reward (better incentive), expanding invite surface (email, SMS, in-app). Most startups ignore this; it's a $1M-swing metric.
▶How do I structure the AARRR pirate metrics funnel for my product?
AARRR = Acquisition (how many sign up) → Activation (% who do core action: open app, create project) → Retention (% who return after 30d) → Referral (% who invite others) → Revenue (% who pay or ARPU). Pick ONE metric per stage to obsess over: Acquisition (CAC), Activation (% complete onboarding in 5min), Retention (DAU/MAU ratio), Referral (invited_users / total_users), Revenue (MRR or LTV). Track these daily. Growth moves the needle on ALL of them, not just signups. Audit: ask where your funnel leaks. If Activation is 5% (low), you're wasting CAC on unripe users—fix onboarding first. If Retention is 20% (low), new users leave fast—product may not solve their problem.
▶How large does a growth team get, and when should I hire a VP Growth?
Stages: Founder (everything) → Growth Engineer (1–2, runs experiments) → Growth Team Lead + Analytics (4–6, prioritization + execution) → VP Growth + 8–12 (product managers, engineers, designers, analysts). Hire VP Growth when: ARR >$2–5M, you have 50+ experiments in backlog, existing leader is bottleneck (can't review prioritization + process), you have board-level growth targets (e.g., 25% month-on-month). Before hiring: define what 'good growth' is for your biz (e.g., CAC payback in 6mo, viral coefficient >1.2). A VP without that context will optimize the wrong metric.
▶Are 'dark patterns' and aggressive growth loops ethical? When should we say no?
Dark patterns (hidden unsubscribe, dark button colors, fake urgency, 'confirm once more') drive short-term growth but destroy trust and retention. They also invite regulation (GDPR, CMA playbooks on dark patterns). Ethical test: if a user realized your tactic, would they feel deceived? Yes = dark pattern. Example: 'Unsubscribe' hidden in footer (dark) vs. one-click unsubscribe in settings (good growth). Build loops on real value, not friction. Refer a friend works because users genuinely want to share. Fake urgency ('Only 2 left!') is a dark pattern if you have stock; it's fair scarcity if you actually do. Ask: 'Would this tactic still work if I removed the dark part?' If no, it's not growth—it's manipulation masquerading as growth. Most sustainable growth loops don't require dark patterns.
▶How is AI changing growth strategies in 2026?
AI-assisted growth impacts 3 areas: (1) Experimentation — LLMs predict experiment outcomes (if A/B testing shows X, B likely beats C), reducing sample-size requirements by 20-40%. (2) Personalization at scale — AI generates personalized onboarding + emails + landing pages per cohort (high-LTV users see premium messaging, churn-risk users see retention incentives). (3) Growth-loop design — AI suggests viral mechanisms given your product (e.g., 'Your product is a project-management tool; try referral bonuses, team invites, and read-only share links'). Practical: use Claude/GPT to ideate experiment backlogs (50+ ideas in 1 hour, then team prioritizes). Use PostHog + Claude to detect retention drops early. AI raises velocity but doesn't replace judgment—you still pick which ideas to test and what to ship.
▶How do I know when to hire a growth team vs. a marketing team?
Growth team = metrics-obsessed product engineers + analysts building self-reinforcing loops (referral, viral, free tier > paid). Marketing team = demand-gen experts buying ads and creating content. If your product can go viral or has a strong free tier (Slack, Dropbox, Figma), invest in Growth first. If you sell a $50k contract to an enterprise customer, invest in Marketing first (sales collateral, content, brand). Hybrid: Growth owns product-led motion and community, Marketing owns enterprise lead gen and brand. Most startups hire Growth when: <$500k ARR, funding available, product has a self-serve path. Hire Marketing when: >$1M ARR or >3 months sales cycle. Don't hire both simultaneously—growth is cheaper and faster for B2C/lower-ACV B2B.