Senior Software Engineer
About Me
Senior Software Engineer with 8+ years of experience delivering production-grade software across AI engineering, full-stack development, and blockchain systems. Strong recent focus on applied AI, including LLM-powered applications, AI agents, and RAG pipelines, combined with a solid background in blockchain protocol development, smart contracts, and decentralized systems.
Skill
DEVELOPMENT
AI Engineering
Blockchain
Frontend
Backend
LANGUAGE
Japanese
English
CODING
95%
LLM Integration
95%
AI Agents
95%
RAG Pipelines
90%
Vector Databases
95%
Prompt Engineering
100%
Python
100%
JavaScript
100%
TypeScript
100%
Go
100%
Rust
100%
React/Next
85%
Vue
90%
React Native
95%
Node.js
100%
REST Api
90%
GraphQL
85%
Prisma
100%
Solidity
100%
Web3.js
100%
Ethereum
100%
Solana
90%
Cosmos SDK
100%
PostgreSQL
100%
MySQL
100%
MongoDB
90%
Redis
90%
AWS
95%
Docker
90%
CI/CD
About Me
Senior Software Engineer with 8+ years of experience delivering production-grade software across AI engineering, full-stack development, and blockchain systems. Strong recent focus on applied AI, including LLM-powered applications, AI agents, and RAG pipelines, combined with a solid background in blockchain protocol development, smart contracts, and decentralized systems.
Skill
DEVELOPMENT
AI Engineering
Blockchain
Frontend
Backend
LANGUAGE
Japanese
English
CODING
95%
LLM Integration
95%
AI Agents
95%
RAG Pipelines
90%
Vector Databases
95%
Prompt Engineering
100%
Python
100%
JavaScript
100%
TypeScript
100%
Go
100%
Rust
100%
React/Next
85%
Vue
90%
React Native
95%
Node.js
100%
REST Api
90%
GraphQL
85%
Prisma
100%
Solidity
100%
Web3.js
100%
Ethereum
100%
Solana
90%
Cosmos SDK
100%
PostgreSQL
100%
MySQL
100%
MongoDB
90%
Redis
90%
AWS
95%
Docker
90%
CI/CD
About Me
Senior Software Engineer with 8+ years of experience delivering production-grade software across AI engineering, full-stack development, and blockchain systems. Strong recent focus on applied AI, including LLM-powered applications, AI agents, and RAG pipelines, combined with a solid background in blockchain protocol development, smart contracts, and decentralized systems.
Skill
DEVELOPMENT
AI Engineering
Blockchain
Frontend
Backend
LANGUAGE
Japanese
English
CODING
95%
LLM Integration
95%
AI Agents
95%
RAG Pipelines
90%
Vector Databases
95%
Prompt Engineering
100%
Python
100%
JavaScript
100%
TypeScript
100%
Go
100%
Rust
100%
React/Next
85%
Vue
90%
React Native
95%
Node.js
100%
REST Api
90%
GraphQL
85%
Prisma
100%
Solidity
100%
Web3.js
100%
Ethereum
100%
Solana
90%
Cosmos SDK
100%
PostgreSQL
100%
MySQL
100%
MongoDB
90%
Redis
90%
AWS
95%
Docker
90%
CI/CD
Resume
EXPERIENCE
05/2023-Present
Senior Software Engineer
Lancers.jp · Freelance
Lead delivery of AI-first and full-stack solutions for startups and growing companies, acting as senior technical owner.
- Design and implement LLM-powered features, including AI agents, chat workflows, and intelligent automation.
- Build RAG pipelines with vector databases to enable accurate, context-aware information retrieval.
- Architect scalable backend systems using Python, Node.js, and Go, integrating third-party APIs and cloud services.
- Develop modern, responsive frontends with React and Next.js, focusing on performance and user experience.
- Collaborate directly with founders and product stakeholders, mentor junior engineers, and enforce engineering best practices.
07/2024-12/2024
Blockchain Core Engineer
Nodexa
Contributed to core development of a standalone blockchain platform, focusing on protocol design and system performance.
- Designed and implemented a new protocol mechanism, reducing CPU/ASIC dependency by 40% and improving network stability.
- Architected scalable blockchain components to support high-throughput transactions with strong security guarantees.
- Developed and optimized smart contracts for DeFi use cases, achieving a 99.8% transaction success rate.
08/2021-07/2024
AI Engineer
スキルアップNeXt
Designed and delivered production AI systems, including LLM-powered applications and intelligent automation features.
- Implemented RAG pipelines using vector databases for semantic search and knowledge-based responses.
- Integrated AI capabilities into existing full-stack products using Python and Node.js.
- Optimized inference latency, prompt design, and operational costs for real-world deployments.
- Worked closely with product, frontend, and backend teams to ship user-facing AI features.
07/2018-04/2021
Full-Stack Engineer
Kyuzan
Developed full-stack applications with a focus on scalable backend services and modern web frontends.
- Built React and Next.js interfaces integrated with backend APIs and blockchain components.
- Collaborated with cross-functional teams to deliver secure, maintainable, and performance-oriented systems.
02/2017-04/2018
Intern | Full Stack Developer
Autify
Built full-stack web applications using React and Node.js, supporting internal and customer-facing tools.
- Developed RESTful APIs and backend services to support frontend functionality.
- Collaborated with designers and product managers to deliver features aligned with business requirements.
EDUCATION
2012-2016
Mie University
Bachelor of Science in Computer Science
2019-2019
Bidify Org
Blockchain Full Stack Developer Program
Recent Works
GAMBLING APP
TOMI DePIN Platform
Job marketplace with crypto
PERI FINANCE
IPOR PROTOCOL
BULLSHITINU
SNAP.ME
Client's voice
I appreciate the high level of technology and honest response to my needs.
Koichiro Takahara
We requested updates several times due to our mistake, but Mr. Yamamoto kindly provided support.
Masashi Mizukura
You did a good job on this project. I'm trying to get you to participate in another project of ours. Great culture, Japanese are awesome👍
Alex Pekler