Building Substack | Sachin Monga (Substack, Facebook)

Episode Summary

Executive Summary: The conversation explores Substack’s evolution from a writing tool into a network for writers and readers, and how product leader Sachin Manga approaches building at a fast-changing, founder-led company. Key themes include principled product strategy, the organizational transition to PM-led teams, managing trade-offs versus large-company product work, and the outsized impact of Substack Recommendations as a growth engine. Manga also outlines Substack’s future around writer empowerment, reader control, community features, and making it easier to start and sustain a publication.

Main Topics: Substack’s product evolution and organization (Priority: 5/5): Manga explains how Substack moved from having no PMs to a more structured product organization with four PMs and three customer-oriented teams plus a systems team. The structure is centered on writers, readers, and growth rather than product surfaces. Working with a strong founder at a small company (Priority: 5/5): He describes the head-of-product role as largely facilitative early on: aligning the team around founder vision, increasing transparency, and building trust through regular weekly check-ins with Chris and the teams. Differences between Facebook and Substack product work (Priority: 4/5): Manga contrasts Facebook’s world of hard trade-offs and irreversible product choices with Substack’s more time-sequenced, rapidly evolving startup environment where process and roles change frequently. Recommendations as a breakthrough growth feature (Priority: 5/5): The discussion goes deep on Substack Recommendations, how it emerged from observed discovery behavior, why it aligned with the company’s control-first principles, and how it became a major engine for subscriptions and network growth. Principled product strategy: control for writers and readers (Priority: 4/5): Substack prioritizes features that increase control for writers and readers, preferring direct, curated, and optional experiences over algorithmic or intrusive growth tactics. Future of Substack: writer economy, reader experience, and community (Priority: 4/5): Manga envisions Substack as a home base for valuable audiences, supporting newsletters, podcasts, video, meetups, and community spaces while evolving into a more compelling reader destination. Advice for starting and sustaining a Substack (Priority: 4/5): He advises aspiring writers to start small, test demand, avoid over-fixating on perceived audience expectations, and understand that consistency matters more than initial virality.

Key Arguments: The internet’s economic model for great writing has historically been poor, but paid subscriptions are creating a better system where small numbers of highly engaged people can sustain valuable work. At Substack, teams are organized around timeless customer problems—writers, readers, growth—because surfaces and tactics change, but the core jobs persist. The head of product at a founder-led startup often acts as a translator and facilitator before becoming a classic decision maker. Strong product process is temporary; as a company grows, any process that works will eventually need to change, so the goal is continuous improvement rather than perfection. Facebook-style product trade-offs often create irreversible second-order effects, while startup trade-offs are more often about timing and sequencing. Substack’s philosophy is to preserve control for writers and readers, even if that makes some features harder to build. Recommendations succeeded because they were writer-curated, opt-in, and aligned with network growth without sacrificing user control. Substack’s next phase is about turning the platform into a network and community layer, not just a newsletter tool. For creators, the most common mistake is overthinking audience perception; readers are often more forgiving and supportive than creators expect. The best way to start on Substack is simply to begin publishing and see whether the work resonates before overcommitting to a business model.

Data Points: PM count at start: 0 - Manga said Substack had zero PMs when he joined. Current PM count: 4 - Substack now has four PMs plus Manga. Initial engineer count: ~15 - He said Substack had roughly 15 engineers when he joined. Product teams: 3 - Writer team, reader team, and growth team, plus a systems team without a PM. Recommendations impact: Millions of new subscriptions - He said Recommendations have driven millions of new subscriptions across writers. Writers receiving subscription benefit: Tens of thousands - Recommendations have helped tens of thousands of unique writers get subscriptions. Network-driven new subscriptions: More than 1 in 3 - Across Substack, more than one in three new subscriptions come from the network. Network-driven paid subscriptions: Around 1 in 10 - He said around one in 10 paid subscriptions now come from the Substack network. Open rate impact: Only a little lower - Lenny noted recommendation-driven subscribers were lower-intent but still valuable, with only a slight open-rate decline. Growth from Recommendations: 70% - Lenny said 70% of his growth comes from the Recommendations feature. Newsletters recommending Lenny: ~500 - Lenny said around 500 newsletters are recommending him. Paid subscriber milestone: 1,000 paid subscribers ≈ $100K/year - Lenny cited his own experience showing the economics of 1,000 true fans. Time to confidence before monetizing: 9 months - Lenny said he wrote weekly for about nine months before turning on paid subscriptions. Internally curated growth test: 100 writers - The product lab is described as an invite-only group of about 100 writers. Meetups: 30 in one month - Manga referenced Lenny’s newsletter community organizing roughly 30 meetups around the world last month. Substack app launch: About 6 months ago - Manga said the iPhone app launched about six months prior and was going well. Time at Facebook: 7+ years - Manga worked at Facebook for over seven years before Substack.

Pivotal Quotes: "I really think that we're just starting into this golden era of what it might mean to be a writer on the internet." — Sachin Manga: Opening framing on the future of writing and the internet economy. "We have teams that are oriented around customers and solving a bit of a timeless customer problem." — Sachin Manga: Explaining Substack’s organizational structure and why it has remained stable. "The main thing I care about is, are we just getting better every week, every month, certainly every year?" — Sachin Manga: His view on process in a rapidly changing startup environment.

Implications: Substack is positioning itself as a durable creator platform built on control, curation, and network effects. For writers, it lowers the barrier to sustainable income; for the industry, it signals a shift away from ad-driven discovery toward trust-based, subscription-led media.