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  • Residence: Japan
  • Age: 30
Skills
11y

Coding

10y

PdM

2y

AI Ops

7y

CEO/CTO

INTRODUCE

Turning Vague Ideas
into Real Output

I work across both business and engineering, turning unclear ideas into real, working products from definition to delivery.

  • Available for work
  • Freelance
rayraypy
ABOUT ME

About Me

Hi, I'm rayraypy. After founding and selling my own business, I gained development experience at major listed companies and led the launch of financial products as CTO at a startup. I excel at executing 0→1 phases from a position that understands both business and technology.

TypeScript React / Next.js Ruby on Rails React Native NestJS
  • 11+
    Years of Experience
  • 10+
    Projects Handled
  • 10+
    Tech Stacks
  • 2
    Startups Founded
SERVICES

My Services

01

Web / Mobile Development

End-to-end development from frontend to backend. Proficient in React, Next.js, React Native, Rails, NestJS, and more.

02

AI Operations

Improving development efficiency with AI tools, building CI/CD pipelines, and automating development processes.

03

Technical Consulting

Supporting architecture design, technology selection, code reviews, and technical debt resolution.

04

PM / Tech Lead

Product management, team leadership, and driving projects from requirements to operations.

SKILLS

My Skills

Next.js
Next.js
React Native
React Native
NestJS
NestJS
TypeScript
TypeScript
Ruby on Rails
Ruby on Rails
Figma
Figma
Jira
Jira
AWS
AWS
GCP
GCP
Vercel
Vercel
Cloudflare
Cloudflare
RESUME

Experience

  • Slash Vision Pte.Ltd.

    Jul 2023 - Feb 2026

    CTO / Lead Engineer / PdM

    Design and development of Web3 token ecosystem and crypto payment credit card service. Overall architecture design, Visa card payment flow design, engineering management.

  • Mercari, Inc.

    Jan 2022 - Jun 2023

    Software Engineer

    Development of shop features for C2C marketplace service. Web frontend design and implementation.

  • Fuetrek Co., Ltd.

    Jan 2021 - Dec 2021

    Software Engineer

    CRM tool renewal development. Frontend design and implementation.

  • Lamila, Inc.

    Jun 2020 - Nov 2020

    Lead Engineer / PM

    New launch of field operations management SaaS. Requirements definition, specification, implementation, and progress management.

  • X Point One, Inc.

    Nov 2019 - Apr 2020

    Software Engineer

    Recipe management and IoT app development, furniture image search app development.

  • Tink, Inc.

    Jun 2016 - Dec 2020

    CEO / PM / Engineer

    New development and operation of cosmetic surgery review app. Web/mobile app design and implementation.

  • div, Inc.

    Aug 2015 - Mar 2016

    Mentor / Engineer

    Mentoring at programming education service.


Education

  • Keio University

    Dropped out

    Faculty of Science and Technology, Computer Science

CONTACT

Let's work together!

Feel free to contact me about projects or work inquiries using the form below.

  • Location

    Japan

  • Email

    rayraypy.biz@gmail.com

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