Justin Jackson: Transistor.fm from $33 MRR to a Calm Multi-Million Business
How Justin Jackson and Jon Buda bootstrapped podcast hosting Transistor.fm—audience-led launch, 50/50 partnership, open RSS, and a calm company that prioritizes margin over hype.
- MRR
- High six figures (third-party estimates; founders confirm multi-million ARR)
- ARR
- Multi-million (self-described); ~$4.5M range in some 2025 estimates
- Users
- Thousands of paying accounts; tens of thousands of feeds hosted
- Founded
- 2018
- Team
- Small (founders + small full-time team)
- Stack
- Podcast hosting, open RSS, AWS
Who is Justin Jackson?
Justin Jackson is the co-founder of Transistor.fm, a podcast hosting platform built with engineer Jon Buda. On X he is @mijustin. Before Transistor he wrote and taught for developers (Marketing for Developers), ran consulting and product work, and built an audience through newsletters and podcasts over many years.
The Transistor story matters to indie founders because it is not a “ship in a weekend and hit $100k” arc. It is a late-30s partnership, modest personal capital, audience-led distribution, and a deliberate choice to stay bootstrapped and calm while the product scaled.
How Transistor started
Jackson and Buda met at the XOXO Festival in Portland in 2014. Both cared about podcasting: Buda had built early hosting tools; Jackson had been podcasting since around 2012. They stayed in touch and shipped smaller projects before committing to a full hosting product.
In early 2018 they formalized a 50/50 partnership. Each put in about $5,000 of personal money (roughly $10k total startup capital). Jackson focused on marketing, docs, support, and inviting early users. Buda kept a day job at first and built nights and weekends.
Official launch was 1 August 2018. In public anniversary writing, Jackson has said first-month revenue was on the order of ~$1,400 MRR with dozens of paying customers. An earlier February 2018 note on his site described a first trickle of revenue around $33 during partnership setup—useful as a reminder that “launch” is rarely a single cliff of cash.
The growth they documented
Jackson has been unusually open about milestones:
- They had expected ~$20k MRR might take years. It took on the order of 11–12 months from launch for both founders to go full-time around that level (August 2019).
- Early post-launch months averaged high double-digit month-over-month MRR growth for a stretch, then slowed and recovered—normal SaaS shape, not a straight line.
- By around 2020 he described the business past ~$50k MRR in interviews.
- In mid-2021, on r/SaaS, he wrote that Transistor did “millions in annual recurring revenue.”
- In a 2025 interview he described on the order of ~7,500 paying accounts, ~49,000 users, 30,000+ RSS feeds, and a team of about six full-time people (founders plus engineering and customer success).
Third-party trackers have estimated roughly ~$375k MRR / ~$4.5M ARR in the mid-2020s. Treat those as estimates, not a founders’ audited disclosure. What is solid is the trajectory the founders themselves published: five-figure MRR within about a year, then multi-million ARR without outside funding.
Distribution: audience first, then systems
Jackson has said a large share of early customers came from the audience he had built over a decade—newsletter, courses, podcasts, and writing for developers. That is a common bootstrap pattern and also a trap if founders stop there.
As the product matured, growth had to become less dependent on one person’s followers. Transistor’s public story emphasizes product quality, open RSS (no lock-in as a positioning pillar), content, and word of mouth among podcasters. The Build Your SaaS podcast with Buda documented the build for years and doubled as marketing and accountability.
Lesson for indie makers: an audience can buy you the first year. A company needs channels that still work when the founder is offline.
Partnership and “calm company” choices
Several choices show up repeatedly in Jackson’s writing and interviews:
Equal equity. He has talked about negotiating a true 50/50 split based on complementary skills (marketing, support, and audience vs. deep engineering), not defaulting to “dev gets more.” Resentment over equity is a silent killer of two-person companies.
Salaries from day one of scale. Around the $30k MRR mark he published a simple allocation: roughly half of revenue toward salaries (split between founders at that time), with the rest for taxes, expenses, and buffer. Predictability mattered more than maximizing founder draw in the early full-time years—especially after he had described a prior period of financial and mental strain before Transistor.
No outside capital. They stayed bootstrapped. That constrained growth rate and product surface area; it also removed board pressure and kept the company sized to the life they wanted.
Open formats. Betting on open RSS rather than a closed walled garden is a product and values decision. It limits some lock-in revenue tactics and aligns with how many independent podcasters want to publish.
What founders should not copy blindly
- Timeline. Transistor’s first serious year was fast relative to their expectations, not a universal template. Many vertical SaaS products take longer to clear $10k–$20k MRR.
- Audience prerequisite. Jackson arrived with a decade of trust. Founders without that still succeed, but their first 50 customers usually come from colder outreach, communities, SEO, or partnerships—not a warm list.
- Revenue screenshots. Public numbers drift. Prefer the founders’ own dated posts and interviews over aggregated “leaderboard” estimates when you cite figures.
Durable takeaways
- Stair-step. Jackson’s path included shops, consulting, info products, then SaaS. Each step funded skills and audience for the next.
- Partnership design beats heroics. Clear split, complementary roles, and shared full-time commitment at a defined MRR threshold.
- Document the work. Public writing and a build podcast created customers and a historical record that still teaches years later.
- Optimize for calm. Margin, small team, and open standards can be intentional goals—not only “not yet big enough for VC.”
Transistor is not the only way to build a durable indie SaaS. It is a well-documented example of starting later than the myth suggests, raising almost nothing, and still building a multi-million-dollar product business on trust and open publishing rails.
Figures above mix founder-published milestones with third-party estimates where noted. Verify current metrics on primary sources before making financial decisions.
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