SEIRO IWAMOTOFUKUOKA 33.59°N / REMOTEREV 2026.07
SPECIFICATION § 00 — PROFILE

Seiro Iwamoto岩元清郎

Backend engineer — AI/LLM product development, from requirements to production.

Embedded in the customer environment, carrying design, implementation, infrastructure, production deployment, and handover to the customer end to end. Go / Python, AWS / GCP. 10 years.

FULL-CYCLE / SOLO-CAPABLE
APPLICATION
  • Move an AI/LLM PoC to production with authentication, auditing, and operations included
  • Rebuild cloud infrastructure that carries technical debt
  • Join before requirements are fixed and take on the design as well
OUT OF SCOPE
  • Mobile native / embedded / game client
  • On-site or full-time-presence engagements
STACK
Go · Python · TypeScript / AWS · GCP / Terraform · Docker / RAG · LLM Orchestration
CAREER
Backend 10+ years — Tech Lead on 4 projects / English-language environments
AVAILABILITY
Open to inquiries — Sole proprietor · quasi-mandate contract · fully remote · rate shared individually
§ 01

WORK

5 CASE STUDIES
FIG. 1 — 2020s

Enterprise AI assistant platform

Customer deployment of a RAG-based AI assistant platform. Requirements, design, implementation, infrastructure, and production delivery, handled end to end.

Python / React / ECS Fargate / LLM API / RAG
OPEN SHEET →
FIG. 2 — 2023–25

Big data SaaS platform

GKE Manual→Autopilot migration, a MySQL→Datastream→BigQuery data pipeline, and construction and operation of Airflow pipelines, handled continuously over two years.

Go / Python / GKE / Cloud Composer (Airflow) / Datastream / BigQuery / Spanner / Cloud Run / Workflows
OPEN SHEET →
FIG. 3 — 2023

Tech Lead in an English-language environment

Evaluated the issues in existing GCP infrastructure and redesigned it from scratch starting at the VPC with Terraform. Set up CI/CD, selected the security-assessment vendor, and ran scrum and hiring in English.

Go / GCP / Terraform / GitHub Actions
OPEN SHEET →
FIG. 4 — 2021–22

Zero trust platform operations automation

On an enterprise zero trust platform, identified operational issues and proposed, designed, and implemented an idempotent automation tool (Go). Also automated CI/CD and Elasticsearch environment setup.

Go / GitHub Actions / AWS CodeBuild / Elasticsearch
OPEN SHEET →
FIG. 5 — 2021

Consumer web app designed from scratch

Designed the AWS architecture for a consumer web app from scratch (API Gateway / VPC / ECS / CloudFront / WAF). Set up SSO with OpenID Connect and CI/CD. Handled it as tech lead.

AWS / ECS / API Gateway / CloudFront / WAF / VPC / OpenID Connect
OPEN SHEET →
§ 02

SKILLS

LANGUAGES
Go · Python · TypeScript · JavaScript · SQL · Bash
FRAMEWORKS
Django / DRF · Echo / gin · React / Next.js · FastAPI · LlamaIndex
CLOUD / INFRA
AWS · GCP · Docker · Terraform · GitHub Actions
DATABASES
PostgreSQL · MySQL · DynamoDB · BigQuery · Elasticsearch
§ 03

ABOUT

Works fully remotely from Fukuoka. Uses chat and documents as the primary means of communication, and writes specifications and acceptance criteria before starting implementation. Writes test code in the same cycle as the implementation. Has run design, operations, and hiring communication in English over chat.

§ 04

CAREER

14 ENTRIES
2026Enterprise AI assistant platformEngineer
2025AI agent application developmentTech Lead
2025Business management system (Go · Next.js)Engineer
2024–25Big data SaaS platform (Phase 2)Engineer
2023–24Big data SaaS platform (Phase 1)Engineer
2023Infrastructure redesign and process improvement (English-language environment)Tech Lead
2022Game backend developmentEngineer
2021–22Zero trust platform operations automationEngineer
2021Consumer web app architecture designTech Lead
2020Serverless platform and batch developmentEngineer
2019Marketing platform developmentEngineer
2018–19IoT application developmentEngineer
2018Sports live-scoring tool developmentEngineer
2017–18Cross-border e-commerce site developmentEngineer
§ 05

CONDITIONS

Contract
Sole proprietor (quasi-mandate)
Working style
Fully remote (based in Fukuoka)
Working hours
Up to 180h / month
Start date
Shared individually
Rate
Shared individually
Availability
Open to inquiries
§ 06

CONTACT

Discuss a project (email) →
commit 9af1769 — realchasesan.com
Author: Seiro Iwamoto <seirou.iwamoto@gmail.com>
Date:   2026-07-06
 
Signed-off-by: Seiro Iwamoto