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Tetsuharu Fujiki

Solo dev, Lafine Systems Design. I build RoamSwitch, a Mac app that hardens your network on untrusted Wi-Fi. Here: shipping an indie security product, and the macOS internals under it.

Location Kanagawa, Japan Joined Joined on  Personal website https://lafine.net/ github website

Work

Independent developer — Lafine Systems Design

How I Used an Uncensored Local LLM for Adversarial QA on My macOS App
lafine_systemsdesign profile

How I Used an Uncensored Local LLM for Adversarial QA on My macOS App

#macos #security #testing #ai
3
Comments 2
5 min read

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Hacking My Own Mac App: Penetration Testing macOS Defense Boundaries in a VM
lafine_systemsdesign profile

Hacking My Own Mac App: Penetration Testing macOS Defense Boundaries in a VM

#security #macos #virtualization #swift
Comments
5 min read
The Hidden Security Blind Spots in Local AI Workflows
lafine_systemsdesign profile

The Hidden Security Blind Spots in Local AI Workflows

#ai #macos #security #llm
Comments
5 min read
Nobody searches for security apps. So I made mine a tool for AI agents instead.
lafine_systemsdesign profile

Nobody searches for security apps. So I made mine a tool for AI agents instead.

#security #ai #indiehackers #macos
Comments
6 min read
My app's landing page says 'Zero Telemetry'. So I wiretapped my own app to prove it.
lafine_systemsdesign profile

My app's landing page says 'Zero Telemetry'. So I wiretapped my own app to prove it.

#security #privacy #testing #networking
Comments 2
7 min read
I open-sourced part of my app, got scared, and fuzzed it before anyone else could
lafine_systemsdesign profile

I open-sourced part of my app, got scared, and fuzzed it before anyone else could

#security #swift #testing #opensource
Comments
6 min read
I attacked my own Mac from another machine on the same LAN — and found a bug in my own app
lafine_systemsdesign profile

I attacked my own Mac from another machine on the same LAN — and found a bug in my own app

#security #networking #linux #homelab
Comments
6 min read
Did you know `next dev` binds to 0.0.0.0 by default?
lafine_systemsdesign profile

Did you know `next dev` binds to 0.0.0.0 by default?

#security #webdev #networking #nextjs
Comments
4 min read
You're probably overestimating public Wi-Fi 'client isolation'
lafine_systemsdesign profile

You're probably overestimating public Wi-Fi 'client isolation'

#security #networking #wifi #privacy
1
Comments 3
3 min read
The app was the easy part. Getting anyone to trust a security tool from a solo dev wasn't.
lafine_systemsdesign profile

The app was the easy part. Getting anyone to trust a security tool from a solo dev wasn't.

#security #indiehackers #startup #opensource
Comments
5 min read
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