About Me
I am an AI Engineer with over four years of backend, cloud, and infrastructure experience. Since August 2025 I have worked as a sub-leader on a generative AI / LLM application team, building LangChain-based applications on Amazon Bedrock and Hugging Face, designing RAG (Retrieval-Augmented Generation) pipelines, and fine-tuning large language models with LoRA/QLoRA. Prior to that I spent two years building backend systems and AWS cloud infrastructure. Certified with JLPT N1, I operate effectively in fast-paced professional Japanese business environments, coordinate multinational engineering teams, and bridge AI development with production-grade cloud architecture.
AI Engineer & DevOps/SRE Specialist
Expertise in LLM Application Development, RAG Pipelines, Model Fine-Tuning & AWS Cloud Infrastructure.
- Certifications: JLPT N1 / ITIL 4 / AWS SAA
- Phone: 080-7005-5953
- City: Osaka, Japan
- Birthday: 5 Oct 1996
- Degree: BCA (Pursuing)
- Email: jangirurafuru@gmail.com
I am highly dedicated to building reliable, production-ready AI systems and cloud infrastructure. From designing RAG pipelines and fine-tuning LLMs with LoRA/QLoRA to provisioning AWS resources with Terraform and CI/CD pipelines via GitHub Actions, I help teams ship generative AI features and high-availability services while maintaining strong engineering discipline as a sub-leader guiding multinational teams.
Technical Skills
My core technical expertise spans generative AI / LLM application development, cloud infrastructure design, backend engineering, and automation pipelines.
Resume
Professional milestones, education history, and industry-standard AI, cloud & SRE certifications.
Professional Certifications
Japanese Language Proficiency Test (JLPT) N1
JEES / The Japan Foundation · 2022
Highest level of Japanese language proficiency, proving fluent professional communication capability in technical business settings.
ITIL 4 Foundation Certification
AXELOS · 2025
Validates core concepts of IT Service Management (ITSM), incident resolution pipelines, SRE operational workflows, and continuous system enhancement lifecycle.
AWS Certified Solutions Architect – Associate (SAA)
Amazon Web Services · 2026
Validates expertise in designing and deploying secure, robust, and cost-efficient cloud architectures on AWS.
Education
Bachelor of Computer Applications (BCA)
Jan 2024 - Mar 2027
Mangalayatan University, UP, India (Online)
Focusing on system design patterns, object-oriented concepts, structural databases, and networking protocols.
IT Technical Department Diploma
2020 - 2022
Osaka Information and Computer Science College, Osaka, Japan
Studies in systems programming, data structures, network security, database administration, and algorithms. Awarded a medal for academic excellence and received the JASSO Scholarship for outstanding performance.
Japanese Language Course
2018 - 2020
First Study Japanese Language School, Osaka, Japan
Moved to Japan in October 2018; completed bilingual training in advanced Japanese grammar, business communications, and social etiquette.
Professional Experience
AI Engineer (Sub-Leader)
Aug 2025 – Present
TDI System Service Co., Ltd.
- Designed and developed LLM applications in Python using LangChain, Amazon Bedrock, and Hugging Face.
- Designed and implemented RAG (Retrieval-Augmented Generation) pipelines for production use cases.
- Fine-tuned large language models using LoRA/QLoRA techniques.
- Built backend services with FastAPI and cloud resources on AWS (Bedrock, Lambda, S3, DynamoDB, CloudWatch).
- Served as sub-leader on a 15-member agile team: distributed tasks, led code reviews, and coordinated a multinational group of engineers.
- Contributed to the successful rollout of a RAG system, working in a Japanese-language documentation and communication environment.
Backend & Cloud Infrastructure Engineer
Oct 2023 - Jul 2025
PayStorage Co., Ltd. (Center Mobile Co., Ltd.), Osaka, Japan
- Added new features and refactored a SIM card sales management system to improve scalability, reliability, and security across user registration, inventory, orders, payments, shipment tracking, and invoicing.
- Adopted Hexagonal Architecture using **TypeScript** and **Node.js** to cleanly separate domain logic from infrastructure adapters, improving extensibility, testability, and maintainability.
- Built and operated AWS cloud infrastructure (Lambda, API Gateway, ECS, S3, DynamoDB, Cognito, CloudWatch, SNS) for the platform.
- Worked with PostgreSQL, MySQL, and DynamoDB across the application's data layer.
- Used Git, GitHub Actions, and Docker for version control, CI/CD, and containerized deployments.
- Participated across programming, operations, and maintenance phases within a 15-member agile team, in a Japanese-language work environment.
Programmer (Backend & Infrastructure)
Apr 2022 - Oct 2023
AppTime Inc., Osaka, Japan
- **Caregiving Product Recommendation App**: Built a product recommendation app for elderly users, families, and caregivers, including a recommendation engine driven by user input and health data, PDF report generation, and QR code generation/scanning, with a Laravel 8 REST API.
- **Push Notification Platform**: Developed a new push notification delivery platform for multiple internal applications using **Firebase Cloud Messaging (FCM)** with Laravel.
- Worked across requirements definition, design, implementation, testing, and operations/ maintenance, in a Japanese-language work environment.
- Tech stack: JavaScript / PHP, Laravel, MySQL, AWS EC2, Firebase, Git / BitBucket.
AI & DevOps Case Studies
Practical demonstrations of generative AI application development, infrastructure as code, and cloud observability solutions.
