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Hi, I'm Hiroshi Iwasaki, a Senior Software Engineer with over 10 years of experience building scalable, real-time web and AI systems. I blend frontend and backend expertise to ship immersive AI-powered features for production users, including real-time chat, avatars, and responsive UI. I enjoy shaping resilient architectures, mentoring junior engineers, and delivering measurable improvements in latency, reliability, and user engagement. When not coding, I love exploring cloud-native tooling and collaborating with product and design teams to drive impactful features.…Hi, I'm Hiroshi Iwasaki, a Senior Software Engineer with over 10 years of experience building scalable, real-time web and AI systems. I blend frontend and backend expertise to ship immersive AI-powered features for production users, including real-time chat, avatars, and responsive UI. I enjoy shaping resilient architectures, mentoring junior engineers, and delivering measurable improvements in latency, reliability, and user engagement. When not coding, I love exploring cloud-native tooling and collaborating with product and design teams to drive impactful features.

Hiroshi Iwasaki

Full Stack Developer, Back-End Developer, Front-End Developer, +2

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Hi, I'm Hiroshi Iwasaki, a Senior Software Engineer with over 10 years of experience building scalable, real-time web and AI systems. I blend frontend and backend expertise to ship immersive AI-powered features for production users, including real-time chat, avatars, and responsive UI. I enjoy shaping resilient architectures, mentoring junior engineers, and delivering measurable improvements in latency, reliability, and user engagement. When not coding, I love exploring cloud-native tooling and collaborating with product and design teams to drive impactful features.…Hi, I'm Hiroshi Iwasaki, a Senior Software Engineer with over 10 years of experience building scalable, real-time web and AI systems. I blend frontend and backend expertise to ship immersive AI-powered features for production users, including real-time chat, avatars, and responsive UI. I enjoy shaping resilient architectures, mentoring junior engineers, and delivering measurable improvements in latency, reliability, and user engagement. When not coding, I love exploring cloud-native tooling and collaborating with product and design teams to drive impactful features.

Available to hire

Hi, I’m Hiroshi Iwasaki, a Senior Software Engineer with over 10 years of experience building scalable, real-time web and AI systems. I blend frontend and backend expertise to ship immersive AI-powered features for production users, including real-time chat, avatars, and responsive UI.

I enjoy shaping resilient architectures, mentoring junior engineers, and delivering measurable improvements in latency, reliability, and user engagement. When not coding, I love exploring cloud-native tooling and collaborating with product and design teams to drive impactful features.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Full-Stack AI Engineer at Concirrus

May 1, 2024 - Present

Orchestrated real-time AI video call prototype using WebRTC, Media Stream, Socket.IO, and OpenAI/Hugging Face; implemented AI-enabled chat and avatar pipeline; achieved 92% session continuity and 2,000+ pilot sessions; reduced end-to-end latency by 42%.

Senior Full-Stack Engineer at AND Digital

July 1, 2021 - April 30, 2024

Collaborated with client product teams to migrate legacy chat apps to React, TypeScript, and GraphQL; shrunk client bundles by 33% and improved first paint by 40%. Migrated streaming APIs to WebSocket-based interfaces; improved concurrency; implemented CI/CD pipelines with Docker, Kubernetes, and GitLab CI; improved observability with Prometheus, Grafana, and ELK; built a component library in Storybook; enhanced session continuity with JWT/Redis.

Full-Stack Engineer at Rakuten

January 1, 2018 - June 30, 2021

Deployed React- and Redux-based customer-facing web applications supporting 500k monthly users; increased conversion in key flows by 18%. Stabilized Node.js and Python backends; introduced rate limiting and circuit breakers, reducing error spikes; improved logging, observability, and MTTR; optimized PostgreSQL queries and chat history performance.

Junior Software Engineer at Fujitsu

April 1, 2016 - December 31, 2017

Introduced modern web practices by adopting TypeScript and modular frontend architecture; redesigned OAuth flows and token lifecycle to resolve authentication failures; led A/B testing and reduced support tickets; accelerated release throughput through iterative improvements.