Hello, I am

Heri Rusmanto

DevOps Certified & Backend Engineer

Infrastructure System Engineer · Cloud & Backend Specialist

Tokyo, Japan

View My Work Download CV Get in Touch
Heri Rusmanto profile picture
Scroll

Who I Am

About Me

Cloud and Backend Engineer with extensive experience administering and optimizing customer systems, ensuring reliability through preventive maintenance and proactive issue resolution. Currently an Infrastructure System Engineer in Tokyo, Japan.

Skilled in system installation, configuration, and implementation with a strong focus on supporting new projects. Experienced migrating applications from virtual machines to containers for greater scalability and efficiency, with backend expertise in Golang, Node.js, Python, and Bash.

Experienced setting up observability with Grafana, Prometheus, and Alertmanager, and working collaboratively with teams to maintain seamless operations and prevent future system issues.

What I Do

Skills & Tools

Backend & Programming

  • Golang Primary backend development
  • Python Automation & scripting
  • Node.js API development
  • Bash Automation & DevOps

Cloud & Infrastructure

  • AWS / GCP Migration expertise
  • Kubernetes Orchestration
  • Docker Containerization
  • Terragrunt Infrastructure as Code

DevOps & Monitoring

  • Grafana Visualization
  • Prometheus Metrics & alerting
  • Alertmanager Alert routing
  • GitLab CI/CD Pipelines

Frontend & Web

  • React / Next.js
  • Astro
  • TypeScript
  • Tailwind CSS

Databases & Storage

  • Elasticsearch Search & analytics
  • PostgreSQL
  • SQLite / D1

My Journey

Experience

  1. Infrastructure System Engineer

    Apr 2025 – Present

    Tokyo, Japan

    • Lead design and development of system architecture for new services
    • Develop software solutions and maintain high-quality, secure code
    • Create and maintain technical documentation
    • Collaborate with teams to deliver features with quality and speed

  2. Cloud Engineer

    Sep 2024 – Mar 2025

    Semarang, Indonesia

    • Administered customer systems with regular checks and maintenance
    • Led migration of applications from VMs to containers
    • Set up monitoring: Grafana, Prometheus, and Alertmanager
    • Provided technical support for new project implementations

  3. Backend Infrastructure (SRE)

    Jul 2022 – Jul 2024

    Indonesia

    • Led AWS → GCP migration using Terragrunt for scalable infrastructure
    • Implemented robust Kubernetes monitoring tooling
    • Optimized deployment workflows, reducing complexity and improving reliability
    • Conducted cost monitoring and optimization for K8s clusters
    • Automated operational tasks with Bash and Python

  4. DevOps Engineer

    Jul 2021 – Apr 2022

    Surakarta, Indonesia

    • Set up and managed Kubernetes clusters for dev/prod environments
    • Configured GitLab CI/CD pipelines, improving delivery speed
    • Implemented cost-efficient cloud resource strategies

Selected Work

Projects

Featured

heri.life — Personal Site & URL Shortener

Production URL shortener + blog on Cloudflare Workers/D1 with a JWT-secured admin panel, multi-tier KV caching (>95% hit rate, ~50ms P50), SSRF protection, and 90.95% test coverage.

Astro TypeScript React 19 Cloudflare D1 Workers

AWS → GCP Migration

Led a full cloud migration using Terragrunt for reproducible, scalable infrastructure, with Kubernetes monitoring and cost optimization across clusters.

Terragrunt GCP AWS Kubernetes

Observability Stack

Designed and deployed end-to-end monitoring and alerting — Grafana dashboards, Prometheus metrics, and Alertmanager routing — for proactive incident response.

Grafana Prometheus Alertmanager

VM → Container Modernization

Migrated legacy applications from virtual machines to containers, improving scalability, deployment speed, and operational efficiency.

Docker Kubernetes CI/CD

Credentials

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
  • Indonesian Native / Bilingual
  • Japanese Elementary

Get in Touch

Let's Connect

I'm always interested in new opportunities and collaborations. Drop me an email or book a time that works for you — I'll get back to you soon.

mail@heri.life Book a Meeting