Looking for a job

Kaito Ota

@kaitoota

Full Stack & AI Engineer guided by clean code, continuous learning and real impact. Open to freelance, contract and long-term opportunities.

Japan

Message

What I'm looking for

I’m looking for remote or flexible opportunities where I can build AI-powered products, solve challenging problems and contribute to a strong engineering team. I’m open to freelance, contract and full-time roles.

I’m a Full Stack and AI Engineer with 8+ years of experience building production-ready web applications, SaaS products and AI-powered solutions. I work across the full stack with TypeScript, React, Next.js, Python, FastAPI, Java, Spring Boot, PostgreSQL, MongoDB, AWS and OpenAI.

I enjoy turning complex ideas into reliable, scalable products and using AI where it can create real business value. I’m especially interested in AI automation, intelligent search, SaaS and building practical products from idea to production.

Experience

Work history, roles, and key accomplishments

Current

Senior AI Engineer

Current

freelance

Sep 2022 - Present (3 years 11 months)

Delivered 10+ full-stack and AI-powered applications for SaaS, automation and Web3 clients. Built scalable APIs, databases, and responsive UIs using TypeScript, JavaScript, and Python. Integrated chatbots, intelligent search and workflow automation. Improved performance by 20–25% through backend and database optimization, while handling authentication, payments, APIs, deployment and maintenance.

Python Next.js OpenAI Lang Chain PostgreSQL AWS TypeScript

AI & Full Stack Developer

Positive Thinking Companay

Oct 2020 - Jun 2022 (1 year 8 months)

Developed and maintained 5+ enterprise web applications with scalable backend services and modern frontends. Built AI-powered automation and text-processing features, designed REST APIs and database structures and improved system performance through debugging and optimization. Worked closely with cross-functional teams in agile environments to deliver reliable, maintainable solutions.

Java Spring Boot React TypeScript PostgreSQL Docker

Full Stack Engineer

Sigma Computing

Feb 2019 - Aug 2020 (1 year 6 months)

Developed backend services, frontend components and database-driven APIs for business applications and internal systems. Built reporting modules and responsive dashboards for desktop and mobile. Improved reliability and performance through testing, debugging and optimization, while contributing to deployment, maintenance and new feature development in agile teams.

NodeJS Express React MongoDB REST APIs

Frontend Developer

ST Engineering Infa Systems Ltd.

Sep 2017 - Dec 2018 (1 year 3 months)

Developed responsive and accessible frontend interfaces for enterprise web applications. Integrated REST APIs and built interactive UI features for internal systems. Improved usability and page performance through optimization, debugging and UI refinements. Collaborated with backend and QA teams to deliver stable user experiences and supported testing, maintenance and production fixes.

Education

Degrees, certifications, and relevant coursework

Niigata University

Bachelor of Science in Computer Science, Computer Science, Data Structures and Algorithms

2013 - 2017

Grade: 4.6

Activities and societies: Software Development, Programming, Web Development, Computer Science Projects

Studied computer science and software engineering with a focus on programming, web development, databases and software architecture. Built academic and personal projects using modern technologies and developed a strong foundation in problem-solving, algorithms and application development. Continued learning AI, cloud technologies and full-stack development through hands-on projects.