Open for Work (From April 2026)

by 逆瀬川ちゃん

2 min read

Hi there! This is Sakasegawa-chan (@gyakuse)!

I've been doing so much solo dev work that my bank account has reached zero, so I'm opening up for business!

Open for work

I'm currently pausing new ongoing/retainer engagements. I'm only taking one-off consulting and advisory work at the moment.

How to reach me

Feel free to get in touch using the format below.

To: [email protected]

Subject: Inquiry about a project

- Your name / company:
- Overview of the request:
- Desired start date:
- Hourly rate:
- Other notes:

A DM on X (@gyakuse) is also fine.

What I can do

Roughly, I can help with things like:

  • Designing and building AI agents and AI applications
  • Setting up and optimizing coding agent environments (Claude Code, Codex, Agent Skills, MCP, Harness)
  • Building AI/ML pipelines for speech recognition (ASR), OCR, structured data extraction, etc.
  • Model training: LLM post-training (SFT, RLHF, etc.) and ASR model fine-tuning
  • Prompt engineering and prompt injection defenses
  • Tech research, benchmark design, and running benchmarks
  • Planning, requirements gathering, and spec writing
  • Writing technical articles
  • Pretty much any other odd job

You can get a feel for what I've been up to lately on my blog, in my roundup of things I've been writing and building around coding agents, or in I Built 10 AI Apps and 3 AI Agents Solo.

What I've built

A quick roundup of recent work.

AI agents

  • Task Agent: a general-purpose agent with 20+ tools. Automated research, travel itineraries, slide generation, and more
  • Computer Agent: a PC automation agent that works on Mac, Windows, and Linux
  • RPA Agent: an automation agent that continues and replays recorded workflows

AI applications (10 in total)

I built AI Study, AI Translator (100+ languages), AI Video Translator (dubbing and subtitles in 50 languages), AI Video Edit Assistant, AI Slide Generator, AI Stylist Assistant (virtual try-on), AI Chat, AI Search (initial response under 250ms), AI Article Assistant, and AI Data Analysis Assistant. See the Zenn article for details.

Around coding agents

  • spark-banana: a browser UI tweaking tool (Codex Spark + Gemini). Published on npm
  • openclaw-defender: a three-layer prompt injection defense library. Published on npm
  • @sakasegawa/ncli: a Notion CLI for coding agents. Published on npm
  • MCP Light: a pattern that cuts MCP context consumption by 83.5%
  • Skill Auditor: a portfolio audit tool for Agent Skills

AI/ML