Open to opportunities

Kazusou Tsubota

@kazusoutsubota

Message

Senior Full Stack Engineer building cloud-native, AI-automated platforms and high-availability web systems end-to-end.

Japan

Message

What I'm looking for

I want to lead end-to-end delivery of cloud-native web platforms and AI-driven automation, taking ownership of architecture, reliability, and performance. I’m looking for a team that values secure engineering, CI/CD rigor, and fast cross-functional execution.

I’m a Senior Full Stack Engineer with experience designing and scaling cloud-native platforms, AI-driven automation systems, and high-availability web applications across ecommerce, SaaS, gaming, and enterprise domains.

At Savvycom, I led the AI delivery team—integrating LLM-powered workflows, AI-assisted QA pipelines, and scalable backend services. I modernized enterprise platforms with React, Next.js, TypeScript, Node.js, and Python, and I improved reliability and deployment efficiency using CI/CD automation, monitoring, and infrastructure optimization.

Previously at AMELA Technology, I built high-performance 3D gaming platforms with WebGL and modern rendering, and I supported production-grade delivery through API integrations, player data systems, and CI/CD workflows. I also served as a core engineer on an EVM-compatible Layer 1 blockchain platform, working on smart contracts, validator integrations, wallet connectivity, and cloud-native monitoring pipelines.

Earlier at GIANTY, I developed cross-platform browser game experiences and contributed to performance and infrastructure optimization for stable production releases. I enjoy collaborating with global cross-functional teams to accelerate delivery, improve operational efficiency, and build secure, maintainable systems aligned with long-term business growth.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

Savvycom

Jan 2023 - Apr 2026 (3 years 3 months)

Led development of an enterprise workflow platform, building cloud-native microservices and REST APIs with React/Next.js and Python-based backends. Integrated LLM-powered automation workflows (OpenAI APIs, LangChain, vector search) to improve operational efficiency and QA/deployment reliability through CI/CD automation and monitoring.

React Next.js TypeScript Python fastAPI Microservices Architecture AWS OpenAI API CI CD

Full Stack Engineer

Amela Technology

Apr 2018 - Dec 2022 (4 years 8 months)

Developed a WebGL-based 3D arcade gaming platform, delivering cross-platform gameplay via optimized rendering and cloud-connected backend services. Also contributed to an EVM-compatible Layer 1 blockchain by implementing smart contracts, validator node integrations, and monitoring-enabled microservices for transaction processing.

WebGL JavaScript TypeScript React Node Docker CI CD Solidity Performance Optimization

Junior Full Stack Developer

Gianty

May 2015 - Mar 2018 (2 years 10 months)

Built and maintained a browser-based WebGL gaming platform with responsive React/TypeScript UI and scalable backend APIs to improve gameplay stability and load performance. Supported frontend/backend performance tuning and CI/CD release workflows to deliver timely, production-ready updates.

React TypeScript WebGL Responsive UI Performance Tuning Browser compatibility Agile Scrum