Han Highemerly

Network & Cloud Engineer

Bridging low-level protocols (BGP, IPv6, TLS, HTTP) and cloud-native infrastructure (Kubernetes, Observability). I specialize in web performance, security, and building reliable systems.

Selected skills

Networking & HTTP

HTTP TLS & mTLS BGP IPv6 L2VPN & L3VPN DNS & DNSSEC Network design

Cloud & Infrastructure

Nginx Contents Delivery (Cloudflare, AWS, etc.) Object Storage Docker Kubernetes PostgreSQL

Observability & CI/CD

Prometheus Grafana Web performance (Core Web Vitals) GitOps SLO design

Application

Web security (OWASP Top 10, etc.) Ruby on Rails Next.js Python Shell scripting (Bash)

Business

Project management Incident response English (Business level)

View full skill list →

Accounts

Mastodon

@highemerly@handon.club

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Articles example (Japanese)

Zenn

TCP Congestion Control (CUBIC, BBR, etc.)

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Zenn

Optical interface (1GE, 10GE, 100GE)

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はんドンクラブ運営ブログ

k8s, gitops, observability(VictoriaMetrics+Loki+Grafana), redundancy design

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はん@highemerlyの日記

Web application design (Next.js)

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Last updated March 2026 Contact