10/21/2026 updated
100 % available
Senior Software Engineer | Node.js, NestJS, React, AWS, Microservices
Kobe, Japan
Only remote
Bachelor's Degree in Computer ScienceAbout me
Senior Software Engineer, approximately 9 years of experience developing scalable, high performance web applications and cloud-native solutions. Proficient in Node.js, NestJS, Python, React, Next.js and AWS, strong expertise in microservices, REST APIs, SQL/NoSQL databases, Redis, and Kafka.
BlockchainWeb3.js
Backend Development with Node.js and NestJS
Approximately 9 years of experience building scalable, high-performance backend systems using Node.js, NestJS, Express.js, and Python. Design and implementation of REST APIs, GraphQL APIs, and gRPC services for data-intensive applications handling millions of daily requests.
Cloud Infrastructure and AWS
Extensive hands-on experience with AWS services including Lambda, RDS, DynamoDB, API Gateway, and ECS. Implementation of serverless architectures, automated deployment pipelines, and containerization using Docker and Jenkins, reducing release cycles significantly.
Frontend Development with React and Next.js
Proficiency in building dynamic, accessible, and SEO-optimized web applications using React.js, Next.js, Redux, Zustand, TypeScript, and modern CSS frameworks such as Tailwind, Bootstrap, and Material Design.
Microservices Architecture
Decomposition of large monolithic applications into microservices, enabling faster feature delivery, easier maintenance, and significantly reduced deployment times across enterprise-level systems.
Message Queuing and Caching with Kafka and Redis
Integration of Redis caching and Kafka queues for asynchronous job processing, real-time responsiveness, and improved system uptime in high-traffic environments.
CI/CD Pipelines
Setup and management of continuous integration and deployment pipelines using Jenkins, GitLab CI, CircleCI, GitHub Actions, Travis CI, Docker, Kubernetes, and Helm to streamline staging and production workflows.
Database Management
Experience with a wide range of SQL and NoSQL databases including PostgreSQL, MySQL, MariaDB, MongoDB, Cassandra, DynamoDB, Redis, Elasticsearch, and Firebase Firestore.
AI Integration
Integration of AI-powered solutions using OpenAI API, AWS Comprehend, and Dialogflow for features such as auto summaries, text tagging, text classification, tone analysis, and intelligent chatbot routing.
Authentication and Security
Implementation of OAuth 2.0 and JWT for secure access control across internal and external API clients, ensuring robust authentication and authorization mechanisms.
Version Control
Proficiency with Git-based version control systems including GitHub, GitLab, Bitbucket, and SVN for collaborative software development and code management.
Approximately 9 years of experience building scalable, high-performance backend systems using Node.js, NestJS, Express.js, and Python. Design and implementation of REST APIs, GraphQL APIs, and gRPC services for data-intensive applications handling millions of daily requests.
Cloud Infrastructure and AWS
Extensive hands-on experience with AWS services including Lambda, RDS, DynamoDB, API Gateway, and ECS. Implementation of serverless architectures, automated deployment pipelines, and containerization using Docker and Jenkins, reducing release cycles significantly.
Frontend Development with React and Next.js
Proficiency in building dynamic, accessible, and SEO-optimized web applications using React.js, Next.js, Redux, Zustand, TypeScript, and modern CSS frameworks such as Tailwind, Bootstrap, and Material Design.
Microservices Architecture
Decomposition of large monolithic applications into microservices, enabling faster feature delivery, easier maintenance, and significantly reduced deployment times across enterprise-level systems.
Message Queuing and Caching with Kafka and Redis
Integration of Redis caching and Kafka queues for asynchronous job processing, real-time responsiveness, and improved system uptime in high-traffic environments.
CI/CD Pipelines
Setup and management of continuous integration and deployment pipelines using Jenkins, GitLab CI, CircleCI, GitHub Actions, Travis CI, Docker, Kubernetes, and Helm to streamline staging and production workflows.
Database Management
Experience with a wide range of SQL and NoSQL databases including PostgreSQL, MySQL, MariaDB, MongoDB, Cassandra, DynamoDB, Redis, Elasticsearch, and Firebase Firestore.
AI Integration
Integration of AI-powered solutions using OpenAI API, AWS Comprehend, and Dialogflow for features such as auto summaries, text tagging, text classification, tone analysis, and intelligent chatbot routing.
Authentication and Security
Implementation of OAuth 2.0 and JWT for secure access control across internal and external API clients, ensuring robust authentication and authorization mechanisms.
Version Control
Proficiency with Git-based version control systems including GitHub, GitLab, Bitbucket, and SVN for collaborative software development and code management.
Experience
Professional experience5 - 10 years
Freelancer since2017
Languages
EnglishFluentJapaneseNative speaker
Project history
Worked on complex enterprise web applications using Node.js, Express, and React. Built RESTful APIs handling more than 1.2 million daily requests. Introduced Firebase Realtime Database and Firestore for instant synchronization. Migrated legacy systems to microservice architecture. Optimized API caching with Redis and implemented Kafka streams. Developed lightweight AI integrations using OpenAI and Dialogflow. Implemented GraphQL layers, established CI/CD pipelines with GitLab and Docker, created internal monitoring scripts, contributed to a Progressive Web App redesign using React and Zustand, and increased test coverage from 60% to 90% using Jest.
Designed and built scalable backend systems using Node.js, NestJS, and AWS, reducing average response times by nearly fifty percent. Broke down a large monolithic application into microservices. Added Redis caching, Kafka queues, and AWS Lambda for asynchronous jobs. Integrated GraphQL APIs, implemented serverless event handling, and used Next.js and React.js to enhance SEO and build dynamic dashboards. Introduced AI tools with OpenAI API and AWS Comprehend. Applied OAuth 2.0 and JWT for secure access control. Automated builds and deployments using Jenkins, Docker, and AWS ECS. Developed internal CLI tools and mentored junior developers. Built internal dashboards with React.js and Chart.js for real-time Kafka event tracking.