CO-FOUNDER & CTO WANTED (Tokyo / Shibuya)
Building SABI — Japan's first AI companion for creative confidence
Hi, I'm Julio — Founder & CEO of
SABI
, based between London and Tokyo.
SABI is an AI companion designed to help creatives practice how to talk about their work, price it, and communicate their value —
safely, humanly, and without pressure
.
Think: a Tamagotchi-like presence meets AI practice, emotional intelligence, and creative growth.
We're building this
Japan-first
, with global ambition.
And now, we're looking for our
third co-founder
.
Where we are now (real momentum)
You're not joining an idea.
You're joining a company already in motion.
- Selected by
Founder Institute Japan - Actively raising
Pre-Seed - Validated in London with 150+ creatives trained
- Early pilots confirmed with creative companies in Japan.
- Strategic partnerships in progress (AI simulations, strengths-based frameworks)
- Supported by
Shibuya Startup Support - Advisory support from senior Japan-based operators (tech & ecosystem)
Current founding team:
- Founder & CEO
(me) — vision, product direction, storytelling, partnerships - Co-Founder & CPO
— product, UX, systems thinking - You
— Co-Founder & CTO
Your Role — Co-Founder & CTO (Non-Negotiable)
We are looking for a
Japanese CTO
to join as an equal partner.
You must be:
- Japanese
(native cultural and language fluency is essential) - Strong in technology
— architecture, integrations, AI systems - Ideally from
gaming, interactive media, or simulation-heavy products - Comfortable building systems that feel
alive, responsive, emotional
This matters because SABI is not a dashboard.
It's a
companion
.
What you'll own
- Technical architecture of SABI
- AI integrations (LLMs, simulations, personalization)
- Systems that support emotion, pacing, and presence
- Early MVP → scalable product
- Hiring and shaping the future engineering team
You will help decide
how
SABI thinks, reacts, evolves.
Why this is different
This is not:
- corporate sales software
- productivity SaaS
- performance pressure tools
This
is
:
- human skill-building
- confidence through safe practice
- technology with empathy
- a product that respects Japanese communication culture
If done right, SABI changes lives.
Compensation & Structure
- Equity:
meaningful co-founder stake (discussed openly, 5–10% range) - Salary:
starts post-funding (target ¥9–12M/year for CTO) - Full transparency
- Full alignment
- Pre-Seed currently in progress
Location
- Tokyo-based (Shibuya)
- Hybrid / remote flexibility
- Core team presence in Japan is essential
If this resonates
You don't need to be loud.
You don't need to be flashy.
You need to care about:
- people
- systems
- craft
- and building something that actually matters in Japan.
Send me a message.
Tell me who you are, what you've built, and
why SABI interests you
.
If there's alignment, we'll build this — properly.
—
Julio
Founder & CEO, SABI
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