Ren Hirose Cruz

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Senior Software Engineer

Mercari US

Feb 2023 - Current (2 years 7 months)

Architecting international integration between Mercari US and Japan platforms, focusing on shared infrastructure and consistent user experience across regions. Frontend Development Created shared component library for cross-region development using Next.js and React.js Implemented dynamic feature flagging system for regional feature deployment Achieved 40% reduction in page load time through code splitting and lazy loading Backend & API Development Designed GraphQL API architecture with schema-first approach and automated type generation Implemented cross-region data synchronization using event-driven architecture Built real-time subscription system with query optimization Infrastructure & DevOps Orchestrated shared microservices architectu

Software Engineer (Tech Lead)

Mercari, inc.

Sep 2020 - Dec 2021 (1 year 4 months)

Spearheaded technical modernization of Mercari's core marketplace platform. Architected micro-frontend infrastructure utilizing Module Federation Pioneered LLM-powered features for product descriptions and search optimization Streamlined deployment process, achieving 50% faster deployments Established comprehensive testing framework with automated regression Tech Stack: Vue.js, Nuxt, TypeScript, GCP Led merchant platform modernization initiative. Re-architected merchant interface using Vue.js and Nuxt.js Migrated to event-driven microservices for merchant onboarding Reduced onboarding time by 30% through system optimization Established development guidelines and testing practices Tech Stack: Vue.js, Nuxt, TypeScript, GCP

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Full Stack Engineer

IKIMONO Inc.

Feb 2018 - Sep 2020 (2 years 8 months)

Created Proff.io, a full-stack resume creation platform scaling to 100,000+ users. Engineered scalable backend using Django with RESTful APIs Built responsive frontend with Vue.js and real-time WebSocket updates Boosted resume generation speed by 60% through caching optimization Designed cloud infrastructure on AWS with Terraform Tech Stack: Django, Vue.js, AWS, MySQL

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Backend Engineer

MTI Ltd

May 2016 - Feb 2018 (1 year 10 months)

Built healthcare management system supporting 50+ hospitals across Japan. Engineered secure API layer with JWT authentication Executed cloud migration to Azure, reducing costs by 40% Established modern CI/CD workflow Tech Stack: C#, Azure, SQL Server

Ren Hirose Cruz

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