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Shogo Yonamine Kaihara

@shogoyonaminekaihara

Message

I build full-stack and AI products that improve acquisition, conversion, and workflows.

Brazil

Message

At Nacif Software Development, I build AI-driven legal tech and e-commerce products for US clients. My LangGraph agents doubled new-client acquisition, improved conversion by 60% through technical SEO, and cut lead-qualification steps by 50%.

I ship end to end across Node.js, TypeScript, React, Next.js, Ruby on Rails, APIs, databases, and cloud deployment. I've also built RAG ingestion for 1 GB+ documents, deployed Rails and Elixir services on AWS, and created internal tools that reduced spreadsheet build time from about 30 minutes to 5.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Software Engineer

Current

Nacif Software Development

Jun 2025 - Present (1 year 3 months)

Developed AI-driven legal tech and e-commerce platforms, doubling client acquisition with LangGraph agents and improving conversion by 60% via technical SEO. Co-owned a greenfield product from zero to production and set AI-assisted development standards.

NodeJS TypeScript React Next.js LangGraph OpenAI API RAG Vector Stores AI Agents Prompt Engineering Supabase Vercel GitHub Actions Mixpanel GoHighLevel SEO Core Web Vitals Claude Code MCP Servers

Junior Software Engineer

Nacif Software Development

Aug 2024 - Jun 2025 (10 months)

Deployed Rails and Elixir services to AWS EC2, integrated Stripe and GiftUp payment webhooks, and built an OpenAI-powered CLI that cut spreadsheet build time from ~30 to ~5 minutes. Shipped redesigned UI components and refactored GraphQL APIs.

Ruby on Rails Elixir GraphQL EC2 Nginx Cloudflare Stripe GiftUp OpenAI API Google Sheets API UI Components API Refactoring

Software Engineering Project (Capstone)

Universidade Federal de Mato Grosso do Sul

Mar 2024 - Dec 2024 (9 months)

Led architectural decisions and produced documentation using the C4 Model and ADRs. Built responsive interfaces with Next.js, Tailwind CSS, Mantine UI, and Vue.js, and integrated with a Laravel REST API.

Next.js Tailwind Mantine UI Vue.Js Chart.Js Laravel PHP C4 Architectural Framework ADR REST APIs

Software Engineering Intern

G2i

Jun 2023 - Feb 2024 (8 months)

Developed an internal Kanban system with CakePHP and Bootstrap, shortening ticket creation time by 60%. Implemented patient management and medical reporting modules in production applications and enhanced legacy systems for telecom clients.

CakePHP Bootstrap Kanban Patient Management Medical Reporting Legacy Systems

Software Engineering Intern

Compass UOL

Jan 2023 - May 2023 (4 months)

Built REST APIs with Node.js, Express, TypeScript, and MongoDB, documented with Swagger, and validated with Postman. Ensured code quality with Jest and Vitest within Agile workflows and deployed to production on AWS.