Bell Curve

Julian Shapiro's journey into growth began four years before launching Bell Curve, when he built Velocity.js, an open-source JavaScript animation engine. With zero initial credibility in the open-source community, he realized that traditional startup growth tactics could be adapted to projects where developers were rarely thinking strategically about distribution. This insight—that good ideas spread poorly across industries—became the foundation for everything he would later do.

Rather than follow conventional open-source marketing, Julian discovered massive untapped channels. He identified that popular open-source news blogs weren't getting hammered with cold pitches like TechCrunch was. He researched editors, understood what content they wanted, and sent them pre-written, publication-ready tutorials on Velocity. All of them said yes. He paid top CodePen creators $50-$100 to build stunning animations showcasing Velocity's capabilities, treating each collaboration as a growth channel with clear CTAs leading back to the GitHub repo. He also identified influential developers on Twitter with engaged audiences and shared these creations with them, generating organic retweets without friction because, unlike startup circles, open-source influencers weren't being constantly pitched.

After proving he could move the needle on Velocity.js, Julian transitioned to helping startups. He started freelancing for friends' companies, beginning with Facebook ads management. When he delivered excellent results, clients referred others, creating a referral flywheel. His approach to outreach was methodical: he'd research a potential client, identify clear value he could provide, ensure his Twitter history and online presence reinforced that credibility, and reach out without asking for anything in return—just offering help. The value demonstration came first, credibility second, pitch third. This converted many conversations into retainers.

Julian discovered that traditional growth agencies were too narrow—they optimized ads in isolation without addressing landing pages, onboarding flows, or product messaging. Yet ads inevitably hit bottlenecks elsewhere in the funnel. He reframed Bell Curve as an in-house CMO service: one team of four people, working across multiple clients via Slack, owning the entire growth funnel from acquisition through referrals. This resonated with YC companies who had just raised funding and needed sophisticated, integrated growth rather than siloed ad management. The key insight was that growth isn't separate from product—a great ad driving traffic to a mediocre landing page and onboarding experience wastes money. Every component matters.

Bell Curve now primarily works with YC-backed startups, managing growth across multiple channels while educating founders on the underlying principles. Julian is simultaneously writing a comprehensive growth guide covering the full funnel: acquisition (ad channels), conversion (landing pages and onboarding), engagement, revenue optimization, and referrals. His philosophy remains consistent: there's a proven rubric for effective growth, specificity converts better than vagueness, and successful strategies from one industry can unlock opportunities in adjacent ones where they haven't yet been applied.