About Me

I’m a Senior DevOps Engineer based in Tokyo, with a passion for building scalable infrastructure, designing cloud systems, and exploring the intersection of security and software engineering.

Currently, I work at メルカリ (Mercari), where I operate and maintain one of Japan’s largest e-commerce platforms serving 10M+ monthly active users. I lead infrastructure modernization initiatives, design developer experience improvements, and architect solutions that empower thousands of engineers to ship faster and more reliably.

What I Do

My expertise spans the modern DevOps and infrastructure landscape:

• Cloud Platforms: AWS, GCP with deep Kubernetes expertise
• Infrastructure as Code: Terraform, Helm, Kustomize, CDK8s
• Container Orchestration: Kubernetes, Istio, Docker
• CI/CD & Deployment: GitHub Actions, ArgoCD, Argo Rollout, Spinnaker
• Observability: Prometheus, Grafana, Loki, ELK Stack, OpenTelemetry, Datadog
• Programming: Go, Python, Bash, Node.js, C++

What I Like

• Playing pianos <3 I plan to record more, but currently this is what I have check it out on Instagram
• Watching Anime and Japanese TV shows. I loved anime & manga growing up, but funny enough living in Japan changed things a bit. I still watch sometimes for Japanese learning and the joy, just not as frequently as before.
• Playing Survival Chaos, a custom Warcraft III map from 2002 that’s still actively maintained. I’m an old-school person who appreciates nostalgia. sometimes the best gems are the ones that have stuck around.

Education

National Yang-Ming Chiao Tung University (formerly National Chiao Tung University)

• Bachelor’s: Computer Science (2012–2016) • GPA: 3.48/4.3
• Master’s: Computer Science (2016–2017) • GPA: 3.9/4.3
• Thesis: SymGDB Symbolic execution integration for debugging

I worked pretty hard during my student days, diving deep into security, reverse engineering, and systems programming. I got to share my CTF knowledge at HITCON community events, which was fun.

Open Source & Speaking

I’ve contributed to the open source community through speaking engagements at major security conferences:

• DEF CON China: Spoke about Triton and symbolic execution on GDB
• HITCON Community: Shared knowledge on CTF for beginners

Some projects I’ve worked on:

• SymGDB: A plugin bringing symbolic execution capabilities to GDB
• Bamboofox CTF Training Platform: Educational resources for CTF competitions

My GitHub profile reflects my journey through infrastructure, security, and developer tools.

Let’s Connect

• 📧 Email: bananaappletw@gmail.com
• 🐙 GitHub: @bananaappletw
• 💼 LinkedIn: bananaappletw
• 𝕏 Twitter: @bananaappletw

Feel free to reach out if you’d like to discuss infrastructure, DevOps, security, or anything else. I’m always happy to chat!