Full Stack Engineer

About the role

Think Different. Build Different. Full Stack Engineer

#1 on ProductHunt. Over 10,000 AI agents generated worldwide within months of launch – that’s our voice AI agent platform Omakase.ai. The product has evolved with major updates including a voice+chat hybrid widget, a smarter recommendation engine, and Shopify integration. Monetization is live, and early ARR is tracking strongly. We’re confident in the trajectory for global impact — that’s why we’re hiring elite engineers to join us from Japan. Let’s scale a Japanese-born AI product globally!

What We Do We’re revolutionizing sales with Omakase.ai – because chatbots just answer questions, but our Agentic Voice AI agents actually close sales. Our voice-powered sales agents behave like real sales reps – persuasive, helpful, and always on-brand. They provide live product recommendations during conversations, conversation analytics to understand customer behavior, and a smarter scraping engine that learns any website instantly with zero setup required.

As a 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 chance 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

- Take full technical ownership of a key product domain (integration systems, data pipeline architecture, conversational AI engine, or client application layer)

- Lead end-to-end full-stack development, from front-end interfaces to backend services and data storage

- Make system architecture decisions designed to scale to millions of concurrent users

- Provide technical leadership through expertise and execution, without direct reports

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

- Japanese conversational skills for team collaboration