Hacker News: josem

New comment by josem in "Ask HN: What are you working on? (September 2026)"

josem — Mon, 14 Sep 2026 02:47:49 +0000

A way for BJJ and martial arts academy owners to manage attendance, payments, class schedules, and student progress.

I train BJJ myself and saw how much time instructors lose to admin work, so I wanted something simpler and more focused than the generic gym software out there and have been having a lot of fun building it with feedback from real academies.

The new addiction to working all the time

josem — Wed, 09 Sep 2026 16:01:45 +0000

Article URL: https://josem.co/the-new-addiction-to-working-all-the-time/

Comments URL: https://news.ycombinator.com/item?id=49628706

Points: 4

# Comments: 0

Start with one customer

josem — Sun, 06 Sep 2026 09:31:05 +0000

Article URL: https://josem.co/start-with-one-customer/

Comments URL: https://news.ycombinator.com/item?id=49584724

Points: 13

# Comments: 0

New comment by josem in "AI companies destroy physical books – let's scan rare books before it's too late"

josem — Fri, 21 Aug 2026 12:06:18 +0000

I think the problem is precisely that for some books there are not too many copies around like you described and if they destroy them we might eventually lose access to them directly. It might sound too extreme, but I understand the fear behind this.

New comment by josem in "Ask HN: What Are You Working On? (July 2026)"

josem — Mon, 13 Jul 2026 05:38:35 +0000

MatGoat (https://matgoat.com/en/): a software for managing BJJ and martial arts academies that it's both easy to use and have everything they need like assistance tracking, payments, communications, etc.

It's going quite well so far with growing MRR each month.

Lately, I've been trying to focus more on marketing, and sales. I might try ads soon as well.

HUMANS.md

josem — Sun, 12 Apr 2026 19:47:22 +0000

Article URL: https://josem.co/humans.md/

Comments URL: https://news.ycombinator.com/item?id=47743658

Points: 2

# Comments: 1

New comment by josem in "Ask HN: What Are You Working On? (April 2026)"

josem — Sun, 12 Apr 2026 19:38:00 +0000

A software for managing BJJ and martial arts academies that it's both easy to use and have everything they need like assistance tracking, payments, communications, etc.

It's called MatGoat[1], and it's going quite well so far. Nowadays I'm working more on the marketing/sales side.

[1] https://matgoat.com/en/

If you don't write it, I don't read it

josem — Tue, 07 Apr 2026 15:17:17 +0000

Article URL: https://josem.co/if-you-dont-write-it-i-dont-read-it/

Comments URL: https://news.ycombinator.com/item?id=47676712

Points: 4

# Comments: 0

New comment by josem in "Ask HN: What are you working on? (February 2026)"

josem — Sun, 08 Feb 2026 23:19:05 +0000

Keep working on MatGoat (https://matgoat.com/en/) - management software for Brazilian Jiu-Jitsu and other martial arts' academies.

I train BJJ and kept hearing the same pain points from academy owners regarding attendance tracking, communications, missing payments, etc.

So I built a tool for martial arts academies in 2024 with belts progression, automated payments, attendance tracking, and a tablet check-in system. Nowadays I'm still onboarding new academies every week and working a bit more on the marketing side to keep growing.

Going back to the physical world

josem — Wed, 04 Feb 2026 14:44:47 +0000

Article URL: https://josem.co/going-back-to-the-physical-world/

Comments URL: https://news.ycombinator.com/item?id=46886416

Points: 1

# Comments: 0

Learning how to stop

josem — Fri, 30 Jan 2026 16:05:59 +0000

Article URL: https://josem.co/learning-how-to-stop/

Comments URL: https://news.ycombinator.com/item?id=46826059

Points: 3

# Comments: 0

New comment by josem in "Ask HN: Share your personal website"

josem — Wed, 14 Jan 2026 21:18:23 +0000

https://josem.co/

New comment by josem in "Show HN: An iOS budget app I've been maintaining since 2011"

josem — Tue, 13 Jan 2026 11:36:50 +0000

Amazing to see such a long tenure in that competitive market. Thanks for sharing!

I wonder, apart from the normal exposure/distribution on App Store, what are the main strategies you've used for marketing?

New comment by josem in "Ask HN: What are you working on? (January 2026)"

josem — Sun, 11 Jan 2026 21:09:43 +0000

Building MatGoat (https://matgoat.com) - management software for Brazilian Jiu-Jitsu and other martial arts' academies.

I train BJJ and kept hearing the same complaints from academy owners regarding attendance tracking, comms, missing payments, etc.

So I'm building a tool for student tracking with belts progression, automated payments, attendance-based promotion criteria, and a tablet check-in system.

Focusing on Spanish-speaking markets first since it's completely underserved. Currently onboarding early academies, and will market it in the US/UK soon.

Tidewave adds React support

josem — Thu, 04 Sep 2025 16:04:13 +0000

Article URL: https://tidewave.ai/blog/tidewave-goes-full-stack

Comments URL: https://news.ycombinator.com/item?id=45128784

Points: 1

# Comments: 0

Aesthetics over Upgrades

josem — Mon, 01 Sep 2025 15:26:44 +0000

Article URL: https://arun.is/blog/aesthetics-over-upgrades/

Comments URL: https://news.ycombinator.com/item?id=45093480

Points: 1

# Comments: 0

The schedule takes care of us

josem — Sun, 17 Aug 2025 06:02:02 +0000

Article URL: https://josem.co/the-schedule-takes-care-of-us/

Comments URL: https://news.ycombinator.com/item?id=44929252

Points: 2

# Comments: 0

What are we losing with AI?

josem — Tue, 29 Jul 2025 16:14:47 +0000

Article URL: https://josem.co/what-are-we-losing-with-ai/

Comments URL: https://news.ycombinator.com/item?id=44725175

Points: 1

# Comments: 0

From simple to ornate and back again

josem — Wed, 07 Aug 2024 14:23:39 +0000

Article URL: https://josem.co/simple-to-ornate-and-back-again/

Comments URL: https://news.ycombinator.com/item?id=41181781

Points: 2

# Comments: 0

New comment by josem in "Why parenting makes you human"

josem — Thu, 18 Jul 2024 20:12:40 +0000

Author here :)

I’m sorry this article felt that way. My intention was not so much saying that you cannot be in touch with that human side if you’re not a parent. It was more about celebrating the good parts of parenting when it comes to how they change you.

That said, I can understand how this could be seen how you shared it, thank you for your thoughts!