How a 19-year-old intern built the growth engine behind this $2B AI company | Hector Serrano

Lenny introduces Hector Serrano, who joined Wispr Flow at 19 and now leads content-related growth. Wispr Flow’s revenue grew 30x in the prior year and the company recently raised at roughly a $2 billion valuation. Hector credits the wider team and explains that his own responsibilities cover the paid UGC program on the creative side, not media buying, plus organic channels for founder Tanay Kothari, including YouTube and Instagram. He says his role evolved from being a creator himself into managing creator partnerships, paid content, and the systems that turn creator output into ads.

Hector says Wispr Flow’s primary growth lever was the product itself. He joined before product-market fit, when the company had a few thousand users, and recalls Tanay saying about six months later that they had “struck gold.” Organic and paid channels then added fuel. When founders ask for a hack, Hector tells them that if growth must be forced, they should revisit positioning and whether the product is genuinely valuable. Lenny agrees that paid acquisition cannot rescue a weak product for long. Hector nevertheless recommends testing paid early, within budget, because it quickly reveals whether cold audiences understand and convert on the product’s message.

Hector learned from former Wispr Flow growth lead Matt to apply an e-commerce-style paid engine to SaaS. Companies often delay paid because they fear saturation, but paid traffic supplies faster feedback on messaging, conversion, and whether the product has legs. Hector says organic content is difficult to evaluate unless a team includes people who understand how to package content for newer channels. Paid also does not have to saturate an ICP: teams can keep finding new positioning angles, messages, and customer segments. The important constraint is to test within the company’s available budget rather than blindly scaling spend.

Wispr Flow first experimented with organic UGC through an intern, Tobin, who recruited creators to post product videos on separate Instagram and TikTok accounts and paid them by CPM—roughly $2 per thousand views at one point. The program generated about 500 million views in two and a half months, but the views produced too few conversions, especially because students were difficult to convert into paying Wispr Flow users. The team shut it down rather than chase vanity metrics. Hector later adapted Tobin’s community model to paid ads, making creators’ videos more directly promotional and compensating them based on performance.

Hector discovered Trybe, created by Lukas Pakter after he had grown the clothing brand SquidHaus through TikTok Shop. Pakter had built an internal system for running creator ads on Meta and paying creators based on performance, then opened it to other companies. Hector saw it as a TikTok Shop-like mechanism for SaaS businesses that cannot use TikTok Shop. Wispr Flow joined early and built a creator program around it. By the time of the interview, the company was launching roughly 500 to 600 ads per month, using creators as a scalable source of paid creative rather than relying on one in-house producer.

Wispr Flow pays SaaS creators a percentage of ad spend rather than trying to attribute every eventual freemium conversion. For e-commerce, Hector says percentage of GMV is more appropriate when purchases are easy to trace. The program also uses a “smart retainer” to reduce creators’ early downside: a creator might be promised $1,500 for 25 videos, but only receive a top-up if commissions fall below that amount. If the creator earns $3,000 in commissions, they keep the commissions without the additional retainer. The arrangement gives creators stability while they learn the product and preserves uncapped upside; some Wispr creators earn $13,000 per month.

Hector argues that brands often send creators lengthy instructions specifying hooks, wording, shots, and product claims, which removes the creative judgment they hired the creator for. Wispr Flow keeps the program open-ended and lets creators experiment, while requiring them to be genuine product users. The resulting ads can be surprising: one creator placed a keyboard outside in the rain, filmed raindrops appearing to type on a laptop, and ended with “download Wispr Flow”; it became one of the best-performing ads. Hector says creators often understand the product and invent concepts better than he could, so no two ads in the library need to look alike.

Hector contrasts his background with Tobin’s: Hector had a 2.5 GPA, did not attend a highly selective school, and played Division I sports, while Tobin had a 4.0 GPA and attended Waterloo. Both became effective marketers, despite their resumes suggesting different choices. Hector recommends looking for proof that a candidate has grown an account—around 10,000 to 15,000 followers is a useful signal—and understands consistency, trends, filming, editing, and packaging. Instagram is a stronger signal than TikTok for him because it is harder to grow with low-effort “brain rot” content; YouTube is also meaningful. Character, work ethic, and cultural fit matter more than grades.

Hector joined just after turning 19, having quit Division I soccer, applied to about 200 LinkedIn jobs, and found Wispr Flow. During his first weeks, he edited a launch video from a calculus class after Tanay asked him to make it more “Gen Z.” For roughly a year he had no clear role and says both he and the company were figuring it out. He later balanced Wispr Flow, two summer classes, and a finance internship in New York, quickly realizing he hated the traditional path; he secretly worked on Wispr and personal content from Soho cafés. Wispr’s willingness to let him experiment and fail allowed the role to click.

Hector recommends starting with a small, strategically chosen group rather than recruiting hundreds of similar creators. First define whether compensation will be a percentage of ad spend or GMV, set up a platform such as Trybe, and identify gaps in the ad library or ICP coverage. Wispr initially grew from roughly five to 10, then 15 and 20 creators, adding five or six every few weeks. Hector now reviews 1,000 to 1,500 weekly applications and accepts only one to three. Wispr also pays $100 for a successful creator referral, but only when Hector approves the person; the group is capped at about 50 to preserve quality and community.

Hector finds early creators through Wispr Flow’s followers, inbound DMs, Instagram keyword searches, and the follower lists of creators he already likes. He recommends 150 to 250 highly targeted DMs over a week, not mass automation, and expects perhaps five or six strong recruits. A typical message praises the person’s content and invites them to join the creator group; details and compensation come later, after interest. Onboarding is personal: Hector asks about the creator’s background, explains the product and workflow, introduces the media buyer, shows example ads, and explains weekly payouts. Weekly meetings, creator coaches, giveaways, and a planned San Francisco retreat make the group feel like a community rather than a transaction.

Hector says UGC is not synonymous with college students. Wispr’s creator group includes engineers, lawyers, mothers, salespeople, agency owners, and an eight-figure e-commerce founder. A technical product should use technical users, and an expensive sleep product should use someone whose age, circumstances, and credibility match its buyer. Ads aimed at older or technical audiences may perform best when they look “ugly”: a long screen recording with minimal production can beat a polished video. Wispr’s large ad volume is partly a discovery mechanism. Hector says an ad that seems inexplicably bad can become the strongest performer, so the team does not impose a high aesthetic bar before testing.

Hector says a company can start with two core people: a creative lead who communicates with creators, develops concepts, approves videos, and manages the program, plus a media buyer who structures the ad account and manages Meta, LinkedIn, YouTube, and other paid channels. Hector prefers creative work and does not enjoy working in Meta Ads Manager, so Eric handles media buying. As Wispr Flow grew beyond 120 employees, marketing remained relatively lean—about 15 full-time people at the time of the interview—with specialists for creators, celebrity talent, design, production, PR, and founder content. The team is flat, with little middle management and broad autonomy.

Hector says older founders often cannot intuit what works for 18-year-olds immersed in Discord, Instagram, and TikTok, so young employees can supply valuable channel knowledge. He compares hiring to sports academies: scout young talent, give it coaching, money, time, and room to fail, then develop future A-players. He is also skeptical of AI-generated final creative. Wispr Flow wants to help humans work better, not publish AI-slop videos, synthetic influencers, or error-filled designs; humans should still handle the important final 10%. Founder-led content complements paid acquisition by making the company human. Wispr’s YouTube series ties episodes—from product launches to Tanay’s personal life—to the mission of reaching one billion daily active users.

Hector says YouTube is a long-term growth channel because videos can continue gaining views months or years after publication. A great production will fail if its title and thumbnail do not earn clicks, so Wispr’s YouTube team focuses on packaging, click-through rate, watch duration, pacing, storytelling, and a thumbnail promise that the video actually fulfills. He considers the long-form team more important than the short-form editing team: once the best story and moments are identified in a polished long-form cut, distributed editors can extract clips more effectively. Wispr’s founder channel reached millions of views and about 21,000 subscribers after only five videos, illustrating the upside of quality and purpose over posting volume.