I’m Masaki Hara, a full-stack developer based in Chiba, Japan, with 9+ years of experience delivering scalable web applications and websites using Python (Django, FastAPI), Node.js, React, Next.js, Vue.js, TypeScript, and CMS platforms like WordPress, Shopify, and Wix. I’ve built RESTful and GraphQL APIs, integrated Stripe/PayPal payments, and leveraged Web3 tools (ethers.js, web3.js) while managing cloud infrastructure with AWS, Docker, Kubernetes, Terraform, and GCP. My work also spans AI/ML (Python), JWT/OAuth2, TDD, databases (PostgreSQL, MySQL, MongoDB, Redis), CI/CD, and OpenAI-based tooling. I enjoy turning complex problems into solid, maintainable systems. I’ve collaborated with cross-functional teams to deliver AI-enabled features, intelligent search, and automation in fintech and government contexts, always prioritizing performance, reliability, and security.…

Masaki Hara

I’m Masaki Hara, a full-stack developer based in Chiba, Japan, with 9+ years of experience delivering scalable web applications and websites using Python (Django, FastAPI), Node.js, React, Next.js, Vue.js, TypeScript, and CMS platforms like WordPress, Shopify, and Wix. I’ve built RESTful and GraphQL APIs, integrated Stripe/PayPal payments, and leveraged Web3 tools (ethers.js, web3.js) while managing cloud infrastructure with AWS, Docker, Kubernetes, Terraform, and GCP. My work also spans AI/ML (Python), JWT/OAuth2, TDD, databases (PostgreSQL, MySQL, MongoDB, Redis), CI/CD, and OpenAI-based tooling. I enjoy turning complex problems into solid, maintainable systems. I’ve collaborated with cross-functional teams to deliver AI-enabled features, intelligent search, and automation in fintech and government contexts, always prioritizing performance, reliability, and security.…

Available to hire

I’m Masaki Hara, a full-stack developer based in Chiba, Japan, with 9+ years of experience delivering scalable web applications and websites using Python (Django, FastAPI), Node.js, React, Next.js, Vue.js, TypeScript, and CMS platforms like WordPress, Shopify, and Wix. I’ve built RESTful and GraphQL APIs, integrated Stripe/PayPal payments, and leveraged Web3 tools (ethers.js, web3.js) while managing cloud infrastructure with AWS, Docker, Kubernetes, Terraform, and GCP. My work also spans AI/ML (Python), JWT/OAuth2, TDD, databases (PostgreSQL, MySQL, MongoDB, Redis), CI/CD, and OpenAI-based tooling.

I enjoy turning complex problems into solid, maintainable systems. I’ve collaborated with cross-functional teams to deliver AI-enabled features, intelligent search, and automation in fintech and government contexts, always prioritizing performance, reliability, and security.

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Skills

Experience Level

Python
Expert
AWS
Expert
Django
Expert
Docker
Expert
JavaScript
Expert
SQL
Expert
React JS
Expert
PyTorch
Expert
PostgreSQL
Expert
Spark
Expert
Node.js
Expert
MySQL
Expert
Tableau
Expert
TensorFlow
Expert
Kubernetes
Expert
TypeScript
Expert
GraphQL
Expert
Go
Expert
WordPress
Expert
Vue.js
Expert
C++
Expert
Redis
Expert
MongoDB
Expert
Laravel
Expert
Shopify
Expert
Oracle
Expert
Stripe
Expert
Jira
Expert
ethers.js
Expert
WiX
Expert
PayPal
Expert
Claude
Intermediate
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Language

English
Advanced
Japanese
Fluent

Work Experience

AI Engineer at CrowdWorks
March 1, 2015 - March 1, 2016
Part-time AI engineering role focused on secure, HIPAA-compliant AI solutions. Led RAG-based radiology report generation by integrating GPT-3.5/4 with medical text retrieval, and built a Django/FastAPI web app to organize patient histories. Implemented anomaly detection for unauthorized data access and ensured compliance with ISO 27001 and HIPAA-like security standards. Deployed services in Docker/Kubernetes with CI/CD and monitoring via Prometheus, Grafana, and Sentry.
Software Engineer at Exceto
March 1, 2023 - July 1, 2025
Built large-scale NLP pipelines for automated content analysis and summarization across millions of documents. Developed RESTful and GraphQL APIs using Django and FastAPI to deploy AI/ML models for insurance claims automation and government document digitization. Engineered backend systems with PostgreSQL, MySQL, and Oracle; integrated LLM-based chatbots and intelligent search features; adopted asynchronous Python, JWT authentication, and IaC-based deployments on AWS. Collaborated with DevOps to implement CI/CD, monitoring, and testing standards with 90%+ test coverage.
Web Developer at TOSXL
April 1, 2017 - February 1, 2023
Built and customized websites using WordPress, Shopify, and Wix; developed secure backend services with Laravel MVC, REST APIs, JWT/OAuth, RBAC, and payment integrations. Implemented real-time features with Node.js and Socket.IO; created responsive front-ends with React/Angular/Vue and managed state with Redux. Optimized databases (MySQL, PostgreSQL, Redis) and applied DevOps practices with Docker, Git, and CI/CD; delivered end-to-end solutions with emphasis on SEO, performance, and accessibility.
Software Engineer at Crowdworks
March 1, 2025 - March 1, 2026
Built a large-scale NLP pipeline for automated content analysis and summarization across millions of documents, increasing processing efficiency using Python-based NLP libraries (SpaCy, BERT, Hugging Face Transformers) and Python-based frameworks (LangChain, DSPy, Haystack). Developed RESTful and GraphQL APIs with Django and FastAPI to enable real-time deployment of AI/ML models for insurance claims automation and public-service document digitization. Engineered backend systems powered by PostgreSQL, MySQL, and Oracle, designing data schemas and optimizing queries for high-volume operations. Integrated LLM-based chatbots, recommendation systems, and intelligent search features using OpenAI APIs, enhancing engagement in fintech and government sectors. Implemented JWT-based authentication, asynchronous services with Python async/await, and automated CI/CD pipelines using GitHub Actions, Docker, and AWS.

Education

Bachelor of Information Technology at University of Delhi
August 1, 2012 - March 1, 2017
Bachelor of Information Technology at University of Delhi
August 1, 2012 - March 1, 2017

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Healthcare, Life Sciences, Government, Financial Services, Professional Services, Media & Entertainment
    paper Generate Title of products using OpenAI

    Developed an AI-powered system for automatically generating product listing titles, taking full responsibility from requirements definition and basic design through implementation and testing.
    Led full-stack development to streamline listing operations and improve title quality by leveraging generative AI based on product data.

    paper Generate Title of products using OpenAI

    Using OpenAI and GenAI, OCR, I built an AI service for E-commerce customers to generate automatically the properties(title, size, memo, material).