Technical Advisory & Development
AI-assisted software development and in-house delivery. From assessing your current systems to planning and implementing the transition.
Discuss development and technical supportSelected clients across our founder’s career
We help you avoid the most common ending: tools nobody uses. We use Claude Code and Codex across all of our own product development and publish our spec-driven workflow as open-source Agent Skills. We rescued a stalled identity-platform project by switching it to AI-driven development, shipping with half the originally planned resources and schedule.
View the OSS: anyoneanderson/agent-skillsWe reduce the risk of breaking what works through assessment and staged migration plans. Deciding what to rebuild and what to keep takes both engineering judgment and investment judgment.
We take on domains nobody else will — starting from the research. DID/VC was one of them: we learned it after being asked, went from studying the standards to designing patent-worthy use cases to building the platform, and became a named inventor on a registered patent (JP7857517) for AI-agent authority delegation. Bringing an unknown domain up to decision-and-implementation grade is what we do.
Fifteen years of payment and O2O systems for Sony Group (consulting), JR-affiliated station retail, Kappa Sushi, Japan Post, and others — including compliance with enterprise security standards and third-party penetration testing. We know how to build systems that must not stop.
1.5 monthsFrom restarting development to the MVP release
Requirements definition through delivery management for payments and O2O systems at major station-retail, apparel, restaurant, and postal enterprises.
For Sony Group and others, our consulting covered not just system design but business plans and investment plans for new ventures.
When AI writes the code, productivity and roles change. Drawing on published experiments from engineering organizations such as OpenAI and the practice of harness engineering, we advised on how evaluation and team structure should evolve.
Read: An introduction to harness engineeringPrices are indicative ranges; a formal quote follows the consultation.
Discuss development and technical support| Service | Estimated fee | Scope |
|---|---|---|
| Start small | ||
| 60-minute consultation | JPY 30k–50k | AI adoption, technology selection, team structure |
| AI-Driven Development & Modernization Assessment | JPY 300k–800k | System and process inventory, risk analysis, improvement plan |
| Project engagements | ||
| AI development workflow adoption | JPY 800k–2M | Claude Code / Codex and CI/CD, from rollout to adoption |
| PoC / MVP development | JPY 1.5M–5M | Rapid validation of new business, AI, and Web3 products |
| Ongoing engagements | ||
| Technical advisory | JPY 300k–800k/mo | Design reviews, technical consultation, direction setting |
| Fractional CTO / architect | From JPY 1.5M/mo | Acting technology lead: team building, vendor management, key decisions |
| Independent review | ||
| Technical due diligence / vendor review | JPY 800k–3M | Third-party review of code, architecture, team, estimates, and debt |
Initial requirements discussion and quote: free.
An example of the report provided with our AI-Driven Development & Modernization Assessment or Technical Due Diligence / Vendor Review. This sample covers development progress, team processes, and an improvement plan. The scope and report contents are tailored to the purpose of each engagement.
Agree on the systems and review period, then examine pull requests, reviews, and work reports.
Investigate delays and concentrated responsibilities, and ask about work the records do not capture.
Receive documented findings, open questions, and an improvement plan with owners and next steps.
Keita Sunaga
Representative, ZenChain LLC / CEO, Samurai Inc.
Started his engineering career developing ATM systems, led e-commerce package development at Digital Garage, and served as a board director and executive officer at e-Cash Inc. (now Pass Co., Ltd.). The company listed on the Tokyo Stock Exchange Mothers market during his tenure. He founded Samurai Inc. in 2010. Following investment from Sony Payment Services, Samurai was acquired by a Web3 company in 2024, and he continues to serve as CEO. He subsequently founded ZenChain LLC, providing technical advisory and development support for AI-assisted software development, system modernization, and in-house development.
We operate with training opt-out settings, and we've built custom hooks that prevent AI tools from sending confidential information externally, configured per engagement. This will be published as our AI usage policy, so you can review it against your security standards before contracting.
Yes. The initial discussion of your requirements and a quote are free. Technical research, assessments, and specific advisory work begin only after you agree to the scope and fees. You can also request a standalone 60-minute consultation or assessment.
On-site residency is not offered in principle. In-person meetings are possible unless the location is remote. Five-day engagements depend on available capacity at the time — please ask during the consultation.
Up to PoC / MVP scale, we build it ourselves. For larger builds, we can help through in-house team design or vendor selection and management — let's discuss.
