United States
Palo Alto, CA
Join 39 AI
Build warmer, more expressive AI products with us.
We're looking for people who are excited about AI, product, and creation - and want to build the next generation of AI products with us.
Locations
Japan
Tokyo
Global
Remote
Company Introduction
39 AI Inc. is a Bay Area-founded, AI-native startup building more natural and emotionally resonant AI product experiences. We explore more authentic, expressive, and companion-like ways for people and AI to connect.
Our current products include the AI audio product FishAudio, AI chat products, and several new AI product directions still in incubation. The team is flat, direct, and fast-moving. We encourage people to speak up, own ideas, and turn them into shipped work quickly.
The team is young, sincere, relaxed, and creator-minded, with a strong anime, comics, and gaming culture, and deep creator roots. We do not set limits around degrees, compensation, equity incentives, office location, or growth paths. We are looking for people who are deeply excited about AI, products, creation, and new things to explore the next generation of AI products with us.
Benefits & Culture
What we offer
We care about speed, craft, and giving people the support they need to do their best work.
Visa sponsorship
We sponsor on a case-by-case basis depending on role and location. Your recruiter will walk through the details on the first call.
We ship fast
Voice AI is moving in weeks, not quarters. We hold a high bar on quality and design and we still ship faster than anyone in the category.
We back each other
Open, direct, low-ego culture. We tell each other the truth and we make each other better.
Highly Competitive Compensation
Highly competitive base salary and meaningful equity.
Health coverage
Platinum medical, dental, and vision coverage.
Office meals
Daily lunch and dinner in office.
Unlimited PTO
Unlimited PTO.
Best-in-class setup
Best-in-class hardware.
Careers
Open Roles
Brand and Creative Designer
Own visual direction and creative execution across campaigns, launches, social media, product visuals, and the long-term brand system.
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Product Designer
Design end-to-end AI product experiences for voice, video, and image products, turning model capabilities into simple, useful, human-feeling workflows.
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Audio LLM Researcher
Research and build audio understanding models and realtime audio LLM systems for natural, low-latency, human-like conversation.
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AI Systems Engineer
Design and optimize high-performance algorithm engines for in-house large model development and real-world AI applications.
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Full-Stack Engineer
Own the full path from database design, APIs, and web frontends to deployment, directly taking AI products from zero to one.
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Forward Deployed Engineer
Embed directly with enterprise customers and turn Fish Audio's models into production voice systems that work in the messiest parts of the real world.
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Solution Engineer
Support B2B client onboarding, third-party vendor integrations, and hands-on technical issue resolution across external systems and our internal platform.
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Developer Relations Engineer
Become the technical face of Fish Audio for API developers, builders, startups, and voice AI teams.
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Founding Account Executive
Build and scale Fish Audio's enterprise GTM motion, selling technical voice AI infrastructure to teams where voice is core to the product.
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Head of Finance & Ops
Build the financial engine behind Fish Audio's growth, from financial modeling and fundraising to controls, compliance, and operations.
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Product Marketing Specialist
Own how Fish Audio shows up for enterprise buyers, developers, and creators, while feeding customer signal back into product.
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