Top all-time · #2426
Peter Reinhardt
Personal blog · rein.pkstartupsbusinessscience
Peter Reinhardt's personal blog at rein.pk covers startups, business and science. Since 2012, 31 different Hacker News readers have linked it 38 times, most often “Startup Finance for Founders: Accounting”. It is still writing: the last post was on 2025-11-20, and you can follow it by feed.
Too few sampled comments (11) to say how often HN recommends it.?
Why HN links it
HN readers link Peter Reinhardt's blog for startup finance guides, essays on technology and work such as replacing middle management with APIs, and science explainers on gravitational lensing and thorium reactors.
Summarised by Claude from a sample of 11 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
CEO at Charm Industrial, prev. CEO at Segment, ex-MIT Aerospace Engineering. I write about learnings from building the company, product development, and physics or technology that piques my interest.
Most-linked posts?
- Startup Finance for Founders: Accounting4 people · 4 mentions · first linked 2016-01-06
- Gravitational Lensing to Observe Ancient Earth4 people · 4 mentions · first linked 2013-03-04
- Over-regulation is doubling the cost3 people · 3 mentions · first linked 2025-11-20
- Replacing Middle Management with APIs (2015)3 people · 3 mentions · first linked 2019-09-12
- Gravitational Lensing to Observe Ancient Earth3 people · 3 mentions · first linked 2019-04-10
- Online Education's Dirty Secret - Awful Retention2 people · 2 mentions · first linked 2013-03-31
- Finding Product Market Fit2 people · 2 mentions · first linked 2018-03-06
- Replacing Middle Management with APIs2 people · 2 mentions · first linked 2015-02-02
- Thorium Reactors2 people · 2 mentions · first linked 2013-01-16
- Startup Finance for Founders – Part I, Accounting (2016)2 people · 2 mentions · first linked 2018-10-05
What Hacker News says?
And the link to the Part II, Strategic Finance: https://rein.pk/startup-finance-for-founders-part-ii-strateg...
Comment linking /startup-finance-for-founders-part-ii-strategic-finance
on “Startup Finance for Founders – Part I, Accounting (2016)”Submitted Replacing Middle Management with APIs as a story · 367 points
HN discussionAdding to this, Peter Reinhardt's post on replacing middle management with APIs. Hollowing out the middle of the career ladder may have a different impact than the historical automation of entry-level jobs. https://rein.pk/replacing-middle-management-with-apis
Comment linking /replacing-middle-management-with-apis
on “Ask HN: Are we building a tech dystopia?”Submitted Thorium as a story · 345 points
HN discussionBlack holes are capable of bending light back towards us: http://rein.pk/gravitational-lensing-to-observe-ancient-eart...
Comment linking /gravitational-lensing-to-observe-ancient-earth/
on “Wild Ideas”Submitted Over-regulation is doubling the cost as a story · 336 points
HN discussionYes, it is possible, but we'd need better telescopes. This post has a pretty good analysis: http://rein.pk/gravitational-lensing-to-observe-ancient-eart...
Comment linking /gravitational-lensing-to-observe-ancient-earth/
on “Astronomers Watch a Supernova and See Reruns”Submitted Thorium Reactors as a story · 328 points
HN discussionCongrats on hitting TC. If you guys haven't read Peter's piece on Thorium it's worth noting that these guys aren't just about analytics: http://rein.pk/thorium-reactors/
Comment linking /thorium-reactors/
on “Segment.io (YC S11) Lets Developers Integrate Multiple Analytics Services”Submitted Startup Finance for Founders – Part I, Accounting (2016) as a story · 209 points
HN discussionReminds me of this excellent article: https://rein.pk/replacing-middle-management-with-apis
Comment linking /replacing-middle-management-with-apis
on “It’s hard work to make ordering groceries online so easy”Submitted Online Education's Dirty Secret - Awful Retention as a story · 197 points
HN discussionI think it's pretty foolish that most programmers assume they will always be "working above the api". http://rein.pk/replacing-middle-management-with-apis/ edit: To clarify, I think AI is the wrong question it's a question of the layers of abstraction and where it puts you in the labor force. Who cares what inhuman force is telling you what to do or how fast to do it?
Comment linking /replacing-middle-management-with-apis/
on “How Robots and Algorithms Are Taking Over”Submitted Gravitational Lensing to Observe Ancient Earth as a story · 140 points
HN discussionThe comments in this article are odd. The process of getting a credit card for a startup is pretty bad -- see the section on "credit cards" here https://rein.pk/startup-finance-for-founders-part-i-accounti... Brex seems like a meaningful improvement over that.
Comment linking /startup-finance-for-founders-part-i-accounting
on “Brex Has Amassed A Valuation Of $1.1B In Under Two Years”Submitted Gravitational Lensing to Observe Ancient Earth as a story · 137 points
HN discussionI love that this is just above the post on https://rein.pk/over-regulation-is-doubling-the-cost It's almost as if the world is complicated and every issue has multiple perspectives. Good luck "aligning", AGI.
Comment linking /over-regulation-is-doubling-the-cost
on “Lawmakers Are Rolling Back Food Safety Rules”Submitted Finding Product Market Fit as a story · 99 points
HN discussionThe last paragraph seems particularly noteworthy: On whether he's taken a MOOC class: "I've never made it through a complete MOOC," Thrun confessed. Much as books have been shrunk down to the size of 140 character tweets, Thrun says he expects that we'll continue to compress education. "I believe that 50 years from now, education will be as short and sweet as Twitter is today. It will be like an evening talk. And th…
Comment linking /online-educations-dirty-secret-awful-retention/
on “Sebastian Thrun On the Future of Education”Submitted MVP Doesn't Mean Anything as a story · 44 points
HN discussionSee https://rein.pk/gravitational-lensing-to-observe-ancient-ear...
Comment linking /gravitational-lensing-to-observe-ancient-earth
on “Can we look at our own past?”Submitted Milestones for SaaS Companies as a story · 28 points
HN discussionSubmitted Over-Regulation Is Doubling the Cost as a story · 14 points
HN discussionSubmitted Better Email Search as a story · 7 points
HN discussionSubmitted Startup Finance for Founders: Accounting as a story · 6 points
HN discussionSubmitted Radioactive.js as a story · 6 points
HN discussionSubmitted Finding Product Market Fit by Segment CEO Peter Reinhardt as a story · 5 points
HN discussionSubmitted Replacing Middle Management with APIs (2015) as a story · 3 points
HN discussionSubmitted Gravitational Lensing to Observe Ancient Earth as a story · 3 points
HN discussionSubmitted Startup Finance for Founders – Part I, Accounting as a story · 3 points
HN discussion
