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Arata Hoshino

@aratahoshino

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Full-stack developer delivering scalable, secure, high-performance systems.

Japan

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What I'm looking for

I seek roles building scalable, secure systems where I can lead architecture, mentor engineers, and drive cloud and AI modernization.

I am a results-driven full-stack developer with progressive experience delivering scalable, high-performance systems across frontend and backend domains.

At Nationwide I advanced through three roles, contributing to system modernization, leading architecture design, and mentoring engineers while supporting traffic at 2M+ requests/day with 99.95% uptime.

I have implemented migrations, gRPC inter-service communication, JWT authentication, RBAC, GDPR and SOC2 compliance, Redis caching, CQRS patterns, and SSR optimizations that improved latency, bundle size, accessibility, and user retention.

I also lead AI-driven initiatives and integrations—building ML models for predictive analytics and fraud detection, automating workflows to cut manual effort, and migrating legacy systems to cloud-supported architectures.

Experience

Work history, roles, and key accomplishments

AI Agent Developer

Nationwide

Jan 2022 - Feb 2025 (3 years 1 month)

Designed and implemented intelligent systems that combine natural language processing, machine learning, and multi-modal data understanding to solve real-world problems. My work focuses on building interactive AI agents and retrieval-augmented generation (RAG) systems using frameworks like LangChain, OpenAI API, and Hugging Face models.

Lang Chain Pinecone Faiss Hugging Face RAG RAG Architecture NLP LLM OpenAI API LLaMA

Machine Learning Engineer

Nationwide

Apr 2020 - Jan 2022 (1 year 9 months)

As an ML/DL Engineer, I designed and implemented machine learning and deep learning models to extract insights, make predictions, and solve complex real-world problems. I handled data preprocessing, feature engineering, model development, and optimization using frameworks like TensorFlow, PyTorch, and scikit-learn.

PyTorch TensorFlow Transformers BERT T5s GPT LLaMA NLP Machine Learning NLP

Frontend Developer

Nationwide

Jul 2018 - Apr 2020 (1 year 9 months)

Built performant React/Next.js applications, reduced bundle size 35% via dynamic import and optimized rendering, improved accessibility and increased user retention while lowering bounce rate by 15%.