About Me

Hi, I'm Heri Rusmanto — a DevOps Certified & Backend Engineer, Infrastructure System Engineer, and Cloud & Backend Specialist based in Tokyo, Japan. I specialize in administering and optimizing customer systems, ensuring reliability through preventive maintenance, and providing proactive issue resolution.

Professional Journey

Currently working as an Infrastructure System Engineer in Tokyo, Japan, I lead design and development of system architecture for new services. I develop software solutions while maintaining high-quality, secure code and creating technical documentation.

I have extensive experience migrating applications from virtual machines to containers, enhancing scalability and efficiency. My expertise includes leading AWS to GCP migration using Terragrunt for scalable infrastructure.

I implement robust Kubernetes monitoring tools and optimize deployment workflows to reduce complexity and improve reliability. My experience includes setting up monitoring tools like Grafana, Prometheus, and Alertmanager for enhanced system observability.

Technical Skills & Tools

Backend & Programming: Golang (Primary backend development), Python (Automation and scripting), Node.js (API development), Bash Scripting (Automation and DevOps)

Cloud & Infrastructure: Cloud Infrastructure (AWS, GCP migration expertise), Kubernetes (Container orchestration and management), Docker (Containerization and deployment), Terragrunt (Infrastructure as Code)

DevOps & Monitoring: Grafana (System monitoring and visualization), Prometheus (Metrics collection and alerting), Alertmanager (Alert routing and management), GitLab CI/CD (Continuous integration and deployment)

Frontend & Web: React, Next.js, Astro, TypeScript, Tailwind CSS

Databases & Storage: Elasticsearch (Search and analytics), PostgreSQL, SQLite, D1

Certifications & Languages

Certifications: DevOps Foundation Certification, LFEL1014: Scaling Cloud Native Applications with KEDA, EF SET English Certificate 74/100 (C2 Proficient)

Languages: English (Professional Working Proficiency), Indonesian (Native/Bilingual), Japanese (Elementary)

Featured Project

Personal Website & URL Shortener: Custom URL Shortener with analytics, Analytics Dashboard for tracking clicks and managing URLs, Category System for organizing links, Secure Admin Panel with JWT-based authentication, Dark Mode with modern UI, deployed on Cloudflare Pages for global edge performance.

Built with: Astro 5, TypeScript, React 19, Tailwind CSS, Cloudflare D1, Cloudflare Pages

Why I Do This

I believe that well-designed infrastructure and automated workflows free developers to focus on innovation rather than mundane tasks. My goal is to build systems that are reliable, maintainable, and scalable — helping teams adopt practices that enable growth through collaborative teamwork and seamless operations.