Oct 30, 2022 · 1h 0m · lennys-podcast
Building Substack | Sachin Monga (Substack, Facebook)
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Sachin Monga, Head of Product at Substack, joins Lenny Rachitsky to discuss product development strategy, organizational design, creator-first recommendation mechanics, and the economic shift toward direct subscription media.
How this conversation actually went
Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. Lenny holds 33% of the talking time here. How this is scored →
Lenny as informed peer 3.4 Guest teaching 2.7 Guest disagreement 0.2 Lenny pushing back 0.2
speaking balance: gold is Lenny, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 18:46 Sachin rejects Lenny's framing of prioritization trade-offs
Sachin explicitly pushes back on Lenny's summary ('No, I think actually...'), explaining that Facebook trade-offs are zero-sum and permanent rather than simple sequencing choices.
Hardest push from Lenny ▶ 18:31 Lenny presses Sachin on big-company vs startup trade-offsLenny drills into Sachin's comparison between Facebook and Substack, attempting to pin down whether the difference is primarily about decision velocity or timescale.
Biggest teaching moment ▶ 18:46 Sachin clarifies zero-sum product tradeoffs at mega-scaleSachin corrects Lenny's premise by illustrating how adding a feature tab in the Facebook core app could permanently cannibalize another key surface area.
Lenny holds their own ▶ 49:57 Lenny applies the 1,000 True Fans model with real newsletter earningsLenny brings strong empirical expertise from his own newsletter economics, demonstrating exactly how 1,000 paying subscribers converted into a viable $100K business.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | Lenny as informed peer | Guest teaching | Guest disagreement | Lenny pushing back | Why |
|---|---|---|---|---|---|---|
| Sachin Monga's Journey to Substack | 3 | 2 | 0 | 0 | Lenny opens with friendly rapport and introduces Sachin's background at Cocoon and Facebook. Sachin explains his career journey and the philosophical alignment around subscription models over ad models that led him to Substack. | |
| Structuring Product Teams at Substack | 4 | 3 | 0 | 0 | Lenny asks about team structure and PM headcounts, offering thoughtful commentary on Substack's supply-driven marketplace dynamics. Sachin outlines their transition to three customer-oriented product teams. | |
| Leading Product with a Product-Minded Founder | 3 | 3 | 0 | 0 | Lenny asks about the classic challenge of working as Head of Product under a product-opinionated founder. Sachin shares practical insights on serving initially as a facilitator rather than sole decision-maker to build mutual trust. | |
| Embracing Continuous Change in High-Growth Startups | 4 | 3 | 0 | 0 | Sachin highlights that processes in high-growth startups become quickly obsolete and PMs must be comfortable feeling out of their depth. Lenny validates and expands on this observation with his own advice to product teams. | |
| Product Trade-Offs: Facebook vs. Substack | 4 | 5 | 3 | 2 | Lenny attempts to summarize Sachin's point on Facebook prioritization as primarily a time-scale difference. Sachin directly clarifies with a 'No, I think actually...', explaining that at Facebook features often represent permanent zero-sum trade-offs rather than just sequencing delays. | |
| Substack's Guiding Principle: Writer and Reader Agency | 3 | 3 | 0 | 0 | Lenny inquires about guiding product principles. Sachin explains how Substack prioritizes writer and reader autonomy and control over algorithm-driven feeds. | |
| Designing and Scaling the Substack Recommendations Engine | 5 | 3 | 0 | 1 | Lenny brings strong firsthand data as a power user, noting 70% of his subscriber growth comes from the recommendations feature. Sachin breaks down the design choices, Chris's early skepticism, and the network graph implications. | |
| Sponsor: Vanta Automated Security Compliance | 3 | 2 | 0 | 0 | Following the mid-roll sponsor break, Lenny shares his personal strategy of rotating recommendations to support smaller writers. Sachin outlines the Product Lab feedback mechanism for testing new features with top writers. | |
| Filtering Media Noise and Staying Focused | 3 | 3 | 0 | 0 | Lenny asks how leadership protects teams from negative press and media noise. Sachin explains the importance of filtering out 90% of external commentary to focus on core product vision, drawing on lessons from his years at Facebook. | |
| Guidance for New Writers and Multimedia Expansion | 4 | 2 | 0 | 0 | Sachin advises prospective writers to simply launch and build optionality. Lenny reflects on his own journey from reluctant blogger to full-time creator, and Sachin points to Lenny's publication as a model of community building. | |
| Overcoming Creator Hesitations and 1,000 True Fans | 5 | 3 | 0 | 0 | Sachin highlights creator psychological hurdles around monetization and vacations. Lenny articulates three key lessons from his personal growth trajectory, referencing Kevin Kelly's '1,000 True Fans' and 'You Are Not Late.' | |
| Lightning Round: Influential Books, Recommendations, and Interviews | 2 | 2 | 0 | 0 | In a friendly lightning round, Sachin recommends Christopher Alexander's architectural treatise 'The Timeless Way of Building' and several Substack creators. Lenny shares an anecdote about Kareem Abdul-Jabbar recommending his publication. | |
| Hiring at Substack and Final Reflections | 1 | 1 | 0 | 0 | Sachin discusses Substack's hiring needs for senior data and growth analytics talent, and Lenny closes the interview with reciprocal gratitude. |
Statements from this episode (15)
Ad-driven models prevent idealized sharing experiences
“Prior to starting Cocoon, Alex and I had both worked at Facebook for a number of years and had worked on effectively the same problem of helping people share more with their friends and family and had all these ideas for what An idealized experience might look…”
Substack operates with just four PMs across three full-stack teams
“So we have Four product managers in addition to myself, and we have three essentially kind of like full stack product teams now that have a PM and an engineering manager, data person, or a designer engineers, and things are starting to roll.”
Organize product teams around customer segments, not specific features
“The teams aren't oriented around product surfaces. Like we don't have a team that's like the app team or a team that's like the dashboard team or the podcasting team. We have teams that are oriented around customers and. Solving a bit of a timeless customer pr…”
Substack's 2017 YC pitch predicted podcasting and network effects
“We're actually doing all those things now that Chris got up on stage and talked about, like, you know, one day in the future, subsets going to get into podcasting and we're going to have this network effect that helps writers grow by virtue of there being othe…”
Mega-app product management requires permanent zero-sum trade-offs
“No, I think actually at Facebook, it's not necessarily whether we do a thing. It's not like we do this now, we do this later. It's doing this thing might mean we can't do this other thing at all. Or it'll mean that instead of that chart being. Steady until we …”
Substack prioritizes writer and reader control over ad models
“It starts with like an opinion for how the internet should work, where people should be in control over their destiny to a much greater extent than has ever really been the case over at least, you know, the last 1015 years where all of a sudden everyone just s…”
Substack recommendations will rank among most legendary platform features
“I think this is going to go down as one of the most legendary impactful features of any platform or marketplace.”
Lenny Rachitsky: Substack recommendations drive 70% of my subscriber growth
“At this .70% of my growth is coming from this one feature. There's something like, 500 other newsletters recommending me. And as soon as the feature launched, and you look at my growth chart, it's just a hockey stick starting that day.”
Lenny Rachitsky rotates recommendations to boost newsletters by 1k subscribers
“So my system right now is I want to share the wealth as much as I can. So I rotate through different newsletters. I help get them Say a thousand subscribers and then move on to the next one.”
Substack runs an invite-only Product Lab of 100 writers
“We actually have now, we've set up something called the product lab, which I'm really excited about... This is just like an invite only little group of a hundred or so writers that, we know are interested in being on the bleeding edge of what Substack is becom…”
90% of media chatter about Substack is a product distraction
“But I'd say, 90% of the chatter about Substack is going to probably ultimately just be a distraction to our product team at the end of the day that should just be focused on Executing on the vision”
Substack prioritizes most valuable audiences over maximum audience size
“If you have an audience anywhere, a sub stack's never going to be the place where you have the biggest audience probably, but it's certainly should be the place where your most valuable audience comes home to where they get your best work.”
Subscribing is a far higher-intent signal than social media follows
“Subscribe as like an action is pretty heavyweight. It's like a costly signal, right? It's not as easy as just like mashing the follow button on a bunch of accounts on Twitter or something like that. If someone is subscribed to you, they're kind of granting you…”
Lenny Rachitsky earned $100K upon reaching 1,000 paid Substack subscribers
“When I got to a thousand paid subscribers, Which feels very doable. I was making around a hundred K, which is exactly, I think it was Kevin Kelly's thousand true fans. Like, it was exactly like, oh wow, I could make a living with a thousand true fans for real.”