Hacker News: mhay

From spaghetti to main bus: refactoring an AI agent orchestrator with Elm

mhay — Tue, 28 Apr 2026 23:35:21 +0000

Article URL: https://blog.mariohayashi.com/p/the-factory-must-grow-part-ii-from

Comments URL: https://news.ycombinator.com/item?id=47942296

Points: 2

# Comments: 0

Show HN: AI-Powered Zettelkasten Using Pinecone and Claude MCP

mhay — Fri, 03 Oct 2025 07:03:08 +0000

This is a prototype I'm using daily. I built a Zettelkasten-inspired note system that uses vector embeddings to suggest connections between notes.

It combines a Zettelkasten-like system with semantic search via Pinecone. When you add a note, AI suggests which existing notes it relates to. You approve the connections, and it maintains bidirectional links automatically.

Unlike traditional Zettelkasten, this treats tasks and knowledge notes equally. My tasks aren't separate from my learning - they're where insights emerge.

Stack: Pinecone, multilingual-e5-large, Claude MCP, shell aliases for quick prompts (zadd, zsearch, zboard).

The magic is in the system prompt (included in repo) that tells Claude Code the ID conventions, connection discovery logic, and workflows.

Early prototype, but the approach feels promising (at least for me!). Looking for feedback from PKM enthusiasts and folks who've built similar tools!

Comments URL: https://news.ycombinator.com/item?id=45459907

Points: 2

# Comments: 0

Ask HN: How do healthcare co's using Stripe and Shopify fulfil HIPAA?

mhay — Tue, 19 Dec 2023 20:50:19 +0000

I was wondering if there are any founders or experts in this area who know how e-commerce sites using software such as Stripe, Shopify, etc., which don't sign BAAs, fulfil HIPAA obligations?

Comments URL: https://news.ycombinator.com/item?id=38701339

Points: 2

# Comments: 1

Show HN: Advent of Code 2022 (only first eight in different langs)

mhay — Fri, 30 Dec 2022 22:36:51 +0000

Tried/revisited/used: Elixir, Haskell, Python, Rust, JS, Rust-WASM, TypeScript, Java. With READMEs for each

Comments URL: https://news.ycombinator.com/item?id=34190937

Points: 2

# Comments: 0

Show HN: Japanese-English picture dictionary, now with SRS flashcards

mhay — Thu, 31 Mar 2022 14:21:13 +0000

Article URL: https://app.kumalearn.com/

Comments URL: https://news.ycombinator.com/item?id=30867519

Points: 2

# Comments: 0

Show HN: Online Japanese-English picture dictionary v0.1

mhay — Thu, 10 Jun 2021 12:40:28 +0000

Article URL: https://app.kumalearn.com/vocab

Comments URL: https://news.ycombinator.com/item?id=27459962

Points: 1

# Comments: 0

Show HN: Learn Introductory Japanese Vocab with Pictures (400 Words)

mhay — Mon, 10 May 2021 16:16:50 +0000

Article URL: https://www.kumalearn.com/ebooks

Comments URL: https://news.ycombinator.com/item?id=27107675

Points: 2

# Comments: 0

Delivering Software: The Product Management Triangle

mhay — Sun, 31 Jan 2021 15:01:20 +0000

Article URL: https://blog.mariohayashi.com/delivering-software-product-management-triangle

Comments URL: https://news.ycombinator.com/item?id=25979302

Points: 4

# Comments: 0

New comment by mhay in "We walked away from a $1.5M seed round and shut down our company"

mhay — Fri, 29 Jan 2021 11:16:20 +0000

Ex co-founder chiming in: was a great experience, with all the expected highs and lows of starting up. Lots of lessons learned and the post captures some of the things we went through behind-the-scenes. Most important of all, we both look back on the experience with positive memories. Please do read!

New comment by mhay in "Show HN: Learn JLPT-N3 Japanese Vocab with Pictures (eBook)"

mhay — Fri, 15 Jan 2021 13:44:16 +0000

FYI — this is a follow-up from my previous JLPT-N5 and N4 free eBooks from the other week: https://news.ycombinator.com/item?id=25744261 I've tried to improve the quality of the eBooks based on your feedback, thank you!

Show HN: Learn JLPT-N3 Japanese Vocab with Pictures (eBook)

mhay — Fri, 15 Jan 2021 13:22:54 +0000

Article URL: https://www.kumalearn.com/ebooks/kumadex-jlpt-n3-25-words

Comments URL: https://news.ycombinator.com/item?id=25790627

Points: 3

# Comments: 1

New comment by mhay in "Show HN: Learn Japanese Vocabulary Visually"

mhay — Thu, 14 Jan 2021 17:49:44 +0000

FYI — I increased the font sizes in version 2!

New comment by mhay in "Show HN: Learn Japanese Vocabulary Visually"

mhay — Tue, 12 Jan 2021 22:23:58 +0000

I'll need to blow up the cards for sure, make them more visible. Expect a second version in the next days. I'll look into vectorising them too... it's been a bit of a technical challenge but hopefully it's not too difficult!

New comment by mhay in "Show HN: Learn Japanese Vocabulary Visually"

mhay — Tue, 12 Jan 2021 14:45:24 +0000

Thanks, this is very useful feedback! Will work on the layout and formatting, as you suggest. I admit, they are quite small, the pictures. I'll try to have less words per page in the next version (and large font!). フィードバックありがとうございます。

...and, yes, anime is the way to go!

Show HN: Learn Japanese Vocabulary Visually

mhay — Tue, 12 Jan 2021 09:17:52 +0000

Article URL: https://www.kumalearn.com/ebooks

Comments URL: https://news.ycombinator.com/item?id=25744261

Points: 16

# Comments: 5

Show HN: Write Copy in Notion, Create GitHub/Gitlab Pull Request

mhay — Mon, 14 Dec 2020 02:29:08 +0000

Article URL: https://copyocean.com/

Comments URL: https://news.ycombinator.com/item?id=25412860

Points: 3

# Comments: 0

Show HN: Write copy in Notion, export to JSON with CopyOcean. For product teams

mhay — Wed, 02 Dec 2020 20:41:01 +0000

Article URL: https://www.copyocean.com

Comments URL: https://news.ycombinator.com/item?id=25281284

Points: 5

# Comments: 1

New comment by mhay in "Ask HN: How to climb up in tech technologically (not by becoming a manager)?"

mhay — Fri, 09 Oct 2020 11:08:22 +0000

There are companies that have two career streams: technical and management. If you go down technical, you might become a principal engineer, etc. If you go down the managerial, you can pursue a director role. If you feel your company isn't offering that and is unlikely to, you can look for such companies.

Note however, I think a bit of management is inevitable as you become more senior. Being senior means you often have the knowledge and expertise to multiply your team's output through interactions beyond individual contribution. By this I mean, bringing senior expertise to the table when planning, being part of the long term strategy and roadmap discussions, involving the team, seeking out contribution for your projects, etc.

Show HN: Blogging about software contracting/freelancing/consulting

mhay — Fri, 09 Oct 2020 10:45:05 +0000

Article URL: http://contracto.dev/

Comments URL: https://news.ycombinator.com/item?id=24728610

Points: 2

# Comments: 0

New comment by mhay in "Show HN: Notion-like design system in React"

mhay — Sun, 02 Aug 2020 14:55:55 +0000

Editor.js — this is awesome! Thanks for sharing.

react-potion I suppose is a possibly less feature-rich but Notion-like/targeted block-based design system in that regard.