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

Nationwide

Jan 2022 - Feb 2025 (3 years 1 month)

Led architecture and mentoring efforts, designed migration roadmap and implemented gRPC inter-service communication with JWT/RBAC, supporting scale to 2M+ requests/day and maintaining 99.95% uptime SLA.

gRPC JWT RBAC PostgreSQL Redis Microservices

Backend Developer

Nationwide

Apr 2020 - Jan 2022 (1 year 9 months)

Improved system reliability by introducing Redis caching and horizontal scaling, reduced API latency from 800ms to 120ms and cut write times ~60% via indexing and CQRS while supporting 2M+ requests/day.

Express PostgreSQL Redis CQRS Performance Tuning Indexing Scalability

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%.