No engineers?
From design
to production.
Shipping an AI-built app, building an MVP or SaaS, or turning Excel-and-fax work into a system: I take it on as your outsourced development lead, from requirements to operations. AI makes the build fast; a human stays accountable for production quality. What gets built stays with you.
- METI Minister's Award–winning SaaS, built solo from requirements to operations
- Zero double charges in production on a payments platform (core engineer in a team)
- NDA before our first call; copyright belongs to you as a rule
Which of these sounds like you?
I built an app with AI and want to launch and run it safely
Built with Claude Code, Cursor, Lovable, v0 or similar, and unsure whether the auth, RLS, payments and backups are ready as they are.
No in-house engineers, but I need an MVP or SaaS
You know what you want to build, but there is no one to trust with the technical calls, or to tell you whether a quote is reasonable.
I want to move Excel, fax and phone work into a system
Double entry and confirmation calls never go away. First, work out where to start.
One point of contact. Your code and cloud stay with you, ready to hand over.
So your business doesn't stall if I become unavailable, the repository and cloud are in your name from day one, handover documents come as standard, and the work stays in a state another engineer can pick up.
Repository and cloud in your name from day one
I work with collaborator access; when the engagement ends, you simply remove it.
Handover documents as standard
A README, an architecture diagram, an environment-variable list and a runbook, at no extra cost.
Infrastructure managed as code (IaC)
Defined in Terraform or similar, so another engineer can rebuild the same environment.
Automated tests and CI as standard
The main business flows are covered by automated tests, so other engineers can change the code safely.
On fixed-scope work, defects found within 3 months of acceptance are fixed free of charge (contractual non-conformity liability). An NDA can be signed before our first call, and copyright in the deliverables belongs to you as a rule.
Track record (numbers)
2,153
Automated tests (backend)
96.7%
Type coverage (another project)
0
Missing-authorization findings (4 self-conducted security reviews)
0
Double charges in production (payments platform)
Case Studies
Selected work
Analog-industry DX, production AI, matching for visitors to Japan — solo builds from requirements to infrastructure, plus full-stack roles on team projects.
- METI Minister's Award
METI Minister's Award winner | A B2B subscription SaaS that brought DX to the lumber-distribution industry
Successfully turned phone/fax/Excel analog trading into a single Web platform (SaaS)
METI Minister's Award | All 221 APIs with 0 missing-authorization findings, proven across 4 rounds of self-conducted security review
Inefficient phone/fax/Excel ordering and Excel-dependent inventory management. With no records left, confirmation took hours every day, and trading with new partners across companies was hard — severely hurting both efficiency and opportunity.
View detailsPython 3.11FlaskFlask-RESTfulSQLAlchemy 2.0MarshmallowAlembic An internal AI platform supporting business operations (built a multi-service foundation and auth hub)
A self-built OIDC auth hub (BFF) binding 5 AI services with Google Workspace SSO, speech synthesis, a typo-detection pipeline cross-checking OCR × speech recognition, and generative-AI content review — built on GCP with IaC
5 AI services unified under a single SSO | a self-built OIDC auth hub, typo detection, and high-standard multi-layered defense built with IaC
Multiple tools supporting siloed operational work (reading aloud, proofreading, review) with AI had to be delivered as an "always-on internal platform" — usable across the board with a single login, meeting an organization's internal-control and security standards, and running heavy, expensive AI processing stably at production quality.
View detailsAn AI video-localization and lip-sync platform
A GPU-inference pipeline that, from just a video upload, runs audio separation → transcription → translation → multilingual dubbing → lip-sync end to end | Earned #1 on the CrowdWorks contract ranking from the evaluation of this project
#1 on the CrowdWorks contract ranking | fully automated 8-language video localization, ~40% lower GPU cost
Doing multilingual video expansion by hand costs hundreds of thousands of yen and weeks per language for translation, dubbing recording, and mouth replacement. A production-grade AI pipeline that automates it all from just an upload was needed.
View details
AI-Augmented Delivery
Built fast with AI, with quality held by human verification gates
Implementation, tests and infrastructure code move faster with generative AI (Claude Code) as a pair. Whether anything ships to production is still decided by a human, after verification.
- 1
Requirements
Sharpen the problem
- 2
Design
Types, boundaries, data
- 3
Build (AI pair)
Accelerated with Claude Code
- 4
Tests & E2E
Unit → API/E2E automated
- 5
IaC
Reproducible with Terraform
- 6
Production
Monitoring, resilience, idempotency
Fast
Fast
Pair-building with generative AI (Claude Code) speeds up implementation, tests and refactoring. With one point of contact from design to infrastructure, nothing gets re-explained across companies.
Safe
Secure
Even AI-written code goes through human verification gates: type checking, automated tests, E2E, and dependency and vulnerability scanning (OWASP Top 10). Quality is not traded away for speed.
Validating contract-honed engineering in my own SaaS
The architecture, SEO, and payments patterns honed in client work get re-sharpened against real operational load by running my own indie SaaS under a single brand.
Plans
Start small, only what you need
From a low-commitment consult to full development and advisory — choose in stages.
Turn your concept
into a working product
“Is it feasible?” “Need an MVP fast?” “Want advice from tech selection on?” — start with a free 30-minute consult.
- NDA available
- Fully remote
- Quasi-mandate, contract & advisory
- Invoicing & contracts handled