Staff Full Stack Engineer

Think Different. Build Different. Staff Full Stack Engineer

#1 on ProductHunt. Over 10,000 AI agents generated worldwide in just 3 months since launch – that's our voice AI agent platform "Omakase.ai."

Our motto: Always Be Launching. Elite global team, Work Super Hard, AI-driven development. Through these principles, we've achieved extraordinary growth at breakneck speed.

We've finally launched monetization and can see ARR on track to exceed $100K in our first month – we're confident we're on the trajectory for global domination. This is why we're hiring elite engineers to fight alongside us from Japan. Let's conquer the world together with a Japanese-born AI product!

What We Do

We're revolutionizing sales with "Omakase.ai" – because chatbots suck. While traditional chatbots just answer questions, our Agentic Voice AI agents actually close sales.

Our voice-powered sales agents work like real sales reps – persuasive, helpful, and always on-brand. They provide live product recommendations during conversations, offer conversation analytics to understand customer behavior, and use our smarter scraping engine that learns any website instantly with zero setup required.

 

As our founding Full Stack Engineer

You’ll dive into global AI product development during our zero-to-one phase. You'll work directly with our CEO and core team from Japan while building for global markets, experiencing AI-driven development with rapid iteration from concept to release. This is your opportunity to shape the future of sales technology from the ground up in an international work environment that welcomes both Japanese and non-Japanese speakers.

 

Your Typical Day With Us 

• Complete technical ownership of a core product area (integration systems, data pipeline architecture, conversational AI engine, or client application layer)
• Full-stack development from user interface through backend services and data storage
• System architecture decisions that will scale to millions of concurrent users
• Technical leadership without direct reports - influence through expertise and execution

 

What you'll Need

• 9+ years building production software systems
• 5+ years building scalable backend services in production environments with Go, plus working knowledge of Ruby on Rails. Equivalent experience with other backend technologies (Python, C#, Node.js, etc.) will also be considered
• 3+ years building modern web applications with React or Vue
• Experience with distributed systems design and microservices architecture
• Global state management in complex frontend applications
• Production database optimization and query performance tuning
• CI/CD pipeline design and automated testing strategies
• Application monitoring, logging, and performance optimization
• Security implementation across authentication, authorization, and data protection
• Experience shipping features that measurably impacted business metrics

 

Technical Environment

• Backend: Go microservices with Rails BFF layer
• Frontend: React with TypeScript
• Data: PostgreSQL with Redis caching
• Infrastructure: Cloud-native deployment with container orchestration
• Development: GitHub-based workflows with automated deployment

 

Preferred Experience

• Server-side rendering or modern meta-frameworks (Remix, Next.js)
• Specific state management libraries (Jotai, Zustand, Recoil)
• Observability tools (application performance monitoring, distributed tracing)
• High-availability system operations and incident response
• Experience with AI-assisted development workflows and modern tooling (Cursor, Windsurf, AI-enhanced IDEs)
• Startup work experience

 

What makes you stand out 

• Engineers who understand that chatbots suck and want to build something that actually works
• Full-stack developers who can cross frontend/backend boundaries and autonomously drive product growth
• Builders with curiosity and drive to immediately implement new AI/LLM technologies into products
• Engineers who thrive on startup speed and can push beyond limits

 

Team & Culture

• 4-person technical team reporting directly to leadership
• "Always Be Launching" - rapid iteration with production focus
• Autonomous execution expected - minimal technical guidance provided
• Participate in incident response and system maintenance alongside founding team, transitioning to structured on-call rotation as we grow
• Japanese conversational skills welcome for team collaboration

 

Working Conditions 

• Location: Tokyo, Japan 
• Exceptional compensation package competitive with top global tech companies
• Full social insurance coverage
• Transportation allowance (up to ¥20,000 with regulations)
• Housing allowance (¥20,000/month if eligible under regulations)
• Holidays: Weekends, Japanese national holidays, Annual paid leave, Summer vacation, Year-end/New Year holidays, Refresh leave
• Hybrid remote work: 1-2 days per week in Tokyo office, increased attendance expected during product launches and critical project phases 
• Visa sponsorship available for international candidates

 

Interview Process

Application screening → HR interview → Technical interview → CEO interview → Panel interview → Offer

 

Now is the time to take your code to the world

We're going after the world now, not "someday."
We're excited to create an incredible future with those who share our vibe.