Founder's Office Intern — Customer Onboarding & Pre-Sales
Work directly with the founders in Tokyo. Help new customers go live on OneInbox, support enterprise deals, and bridge Japanese and English across the business.
- Business
- Tokyo, Japan (Hybrid)
- Hybrid
- Internship · Part-time
- YoE 0 - 2 Years
- ¥1,300 – 2,000 / hour
About OneInbox
- We're putting voice at the heart of how enterprises actually run.
- We're the production-grade voice AI platform built for Japan and Asia-Pacific.
- We're handling millions of real calls every month — in Japanese, English, Hindi, and Arabic — for banks, real estate firms, and government services.
- Try OneInbox today.
Why we're hiring this role
- Our Tokyo customer base is growing faster than the founders can personally onboard and support it.
- Every new enterprise customer needs a smooth first 30 days, and every deal needs crisp Japanese materials. Today that work sits with the founders.
- We want someone who learns by doing the real thing: sitting in on deals, setting up accounts, and talking to customers from week one.
What you'll be doing
First 30 days
- Join the founders' customer calls and demos, and capture requirements and feedback for the product team.
- Learn the product by building your own OneInbox workspace and first voice agent.
- Translate and localize decks, help articles and customer emails between Japanese and English.
- Take over the CRM and customer notes so nothing falls through the cracks.
First 60 days
- Onboard new customers with a founder alongside: set up the workspace, configure the first voice agents, and walk the team through the dashboard.
- Prepare demo environments, Japanese proposals and follow-ups for enterprise prospects.
First 90 days
- Own the first 30 days for a set of new customers, so they come to you first.
- Leave behind an onboarding checklist and Japanese templates the next customer can start from.
Who you are
- Native-level Japanese and conversational English: you can read, write and join a call in English.
- Student, recent graduate or early-career, in any major and from any background.
- Available for 3–6 months at roughly 10–20 hours a week, with flexibility across days.
- Comfortable talking to customers, asking questions and following up without being chased.
- Curious about AI and SaaS. You've tried a few AI products and have opinions about them.
- Organized and self-directed: you keep your own task list and close loops.
- Nice to have: part-time sales, customer-facing or startup experience, and familiarity with Slack, Notion, Google Workspace or a CRM.
Why OneInbox
- The full picture: see how an enterprise AI company sells, onboards and ships, from the founders' seat.
- Real responsibility: customers will know your name by week two.
- Kind, high-bar team: senior operators who've built and led at scaled companies, and are easy to work with.
- A path forward: strong interns are the first people we talk to when we open full-time roles in Tokyo.
What we offer
- Hourly pay: ¥1,300 – 2,000 per hour, depending on experience.
- Flexible hours: a part-time schedule that fits around university or other commitments.
- Hybrid work: split between our Tokyo office and home.
- Office days: commuter support and catered meals.
- Mentorship: directly from the founders and the Tokyo business team.