Open to opportunities

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

Senior Backend Developer & AI Engineer

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

Backend Developer & ML 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%.

React Next.js TailwindCSS Accessibility Performance Optimization Webpack Frontend Engineering