HAYATO EIHARA
I build AI chatbots & SaaS products with React + Supabase
New to Contra
HAYATO is ready for their next project!
Built and operate a cross-border e-commerce store selling Japanese products to international customers. Handled everything solo — store setup, product sourcing, international shipping logistics, customer support, and marketing. The store serves customers worldwide and processes payments in multiple currencies.
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Built and launched an AI-powered SaaS tool that helps freelancers generate tailored project proposals in seconds. Users paste a job description, and the AI produces a professional, customized cover letter ready to submit. Features include saved templates, tone/style adjustment, multi-language support, user authentication, and Stripe subscription billing. Tech stack: React, TypeScript, Supabase, OpenAI API (GPT-4o-mini), Stripe. Solo-built end-to-end.
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ResponAI — AI Chatbot Builder SaaS (Full-Stack, Solo-Built)
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Built and launched a SaaS tool that helps businesses collect, manage, and showcase customer reviews and testimonials. Businesses can create custom review collection forms, share them via link, and display approved reviews on their website using an embed widget. Features include a review management dashboard, email notifications, embeddable testimonial widgets, and Stripe subscription billing with webhook-based access control. Tech stack: React, TypeScript, Supabase, Stripe. Solo-built from scratch.
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