H.
Tokyo, Japan

Python at the core.
Product in perspective.

I’m Hirokoma, a.k.a. Haoju, a Python engineer and technical lead who works across the full product lifecycle—from architecture and implementation to delivery, customer feedback, and team leadership.

GitHub LinkedIn
9+ years in software
engineering
6+ years focused on
Python systems
3 languages for global
collaboration
01 / About

Deep in Python.
Broad in ownership.

I began my software engineering career in 2017 after completing my master’s degree. Early work across web, mobile, and cloud infrastructure gave me the range to understand products as whole systems—not isolated pieces of code.

I later specialized in the Python ecosystem and grew from backend engineering into full product ownership. Today I combine hands-on development with technical direction, project management, and hiring.

Build

Python · FastAPI · Django
APIs · Data · Distributed systems

Own

Frontend · Cloud infrastructure
Testing · Security · Operations

Lead

Technical direction · Delivery
Project management · Hiring

02 / Expertise

From architecture
to adoption.

01

Python backend engineering

Designing clear APIs, dependable services, data workflows, and maintainable architectures.

Python · FastAPI · Django · PostgreSQL · Async I/O · Performance

02

End-to-end product ownership

Taking SaaS products through implementation, infrastructure, releases, maintenance, and improvement.

Vue · TypeScript · GCP · Kubernetes · Docker · Terraform · CI/CD

03

Customer-facing engineering

Working on-site, listening closely, supporting installations, and turning real-world feedback into better software.

Field support · User acceptance testing · Requirements · Product feedback

04

Cross-functional delivery

Aligning internal teams and external vendors around API integrations, priorities, and practical outcomes.

Cantonese · English · Japanese · Vendor collaboration · Project leadership

03 / Philosophy

See the whole.
Care for the details.

01

Attention to detail

Quality lives in the small decisions—from naming and failure modes to the final user interaction.

02

Holistic understanding

I look beyond the immediate task to understand the system, the people, and the business around it.

03

FDE mindset

My direction is forward-deployed engineering: combining an engineer’s depth with a product manager’s ownership.

04 / Certifications

Learning,
applied.

01

Deep Learning Specialization

DeepLearning.AI

02

Machine Learning Specialization

DeepLearning.AI

03

Google Project Management Certificate

Google

04

Applied Information Technology Engineer Examination

応用情報技術者試験

05

Japanese-Language Proficiency Test N1

Open to meaningful conversations

Bring me closer
to the real problem.