Skip to content
ren

your dearest friend

白坂れん・しらさか れん

laid-back until the pager goes off. I keep other people's infrastructure alive for a living, and I would very much like to tell you about it — but first, the okonomiyaki.

yaho~ ٩(◕‿◕｡)۶
yaho~ ٩(◕‿◕｡)۶

Seven things, before we go any further

  • My terminal is pink. So is my entire room.
  • I fix prod at 3AM in fuzzy socks and call it "incident command."
  • Windows? Don't know her. I dual-boot Arch and more Arch.
  • Fluent in YAML, native in Japanese, lethal in PR review.
  • p99 latency is a personal insult. We're working through it.
  • Remote from my room — my sanctuary.
  • If I do it twice by hand, the third time is a script. That's a promise.

the facts

Role
DevOps · Security · Cloud · Servers
Based
Kawasaki, Kanagawa 🗾
Working
Remote
Timezone
JST UTC+09:00
Pronouns
she/her

what people hire me for

  • Data Center Architecture
  • Site Development
  • Construction Management

Most platform engineers have never touched the layer underneath the hypervisor. I have racked it, powered it and cooled it.

0+

years in

0

companies

0

roles held

0

clouds

0

builds shipped

0

things in the toolbox

65 months of it, if you would rather count that way.

The Shirasaka lineage 白坂家

A family that keeps IT knowledge and passes it down. For generations we've quietly sent brilliant minds into the industry to push it forward. I'm the branch that keeps the lights on: DevOps, Security, Cloud, Servers.

白坂のITを受け継ぐ、まったり系です。

inheriting the Shirasaka IT lineage — the laid-back type

Where I have been

Reverse chronological, because that is how everyone reads these. Every date is off the CV.

  1. Yorusa Inc.

    PT Yorusa Teknologi Indonesia

    Jakarta, Indonesia

    Platform Engineer

    Jun 2026 — Present · 3 mo

    Building the internal platform — the paved road between a developer's laptop and production.

    • Golden paths for service scaffolding, deploys and rollbacks
    • Self-service infrastructure behind a pull request
    • Kubernetes
    • Terraform
    • GitHub Actions
    • Go

  2. Monarch Tech

    PT. Monarch Inti Teknologi

    Jakarta, Indonesia

    DevOps Engineer

    Apr 2026 — Present · 5 mo

    Scalable, high-availability infrastructure across four clouds — and the DDoS mitigation in front of it.

    • Multi-cloud footprint across AWS, GCP, Huawei Cloud and DigitalOcean
    • Kubernetes orchestration and CI/CD automation end to end
    • Infrastructure monitoring and DDoS mitigation lifting SLA performance
    • AWS
    • Google Cloud
    • Huawei Cloud
    • DigitalOcean
    • Kubernetes
    • Cloudflare

  3. MGM Laboratory

    Malang, Indonesia

    Head of IT Infrastructure & Architecture

    Feb 2026 — Present · 7 mo

    IT strategy, enterprise architecture and hybrid multi-cloud operations for 100+ internal users.

    • Resilient infrastructure across on-prem DC, Google Cloud, AWS and Azure
    • HashiCorp Consul for L2/L3 routing and service discovery
    • 25+ critical services under SLA/DR, with FinOps-driven cost control
    • Server capacity, power and thermal planning; vendor and cross-functional ops
    • Consul
    • Google Cloud
    • AWS
    • Azure
    • Proxmox VE
    • FinOps

    Platform Engineer

    Nov 2025 — Feb 2026 · 4 mo

    Built the hybrid cloud from bare concrete up — server room, HVAC, hypervisor, then the platform on top.

    • Engineered the on-prem server room, HVAC and Proxmox VE virtualisation
    • Architected GCP infrastructure with GCE, GKE and Terraform
    • Deployed 25+ internal OSS services for CI/CD, observability, IAM and data
    • Proxmox VE
    • GKE
    • Terraform
    • GitLab
    • Kafka
    • Keycloak

    10 mo in total, across 2 roles

  4. Arunika Data Center

    Jakarta, Indonesia

    Infrastructure Engineer

    Dec 2025 — Jun 2026 · 7 mo

    End-to-end design and build of enterprise-scale data centre infrastructure — site acquisition through to server rack architecture.

    • Site acquisition, financial planning and MEP engineering
    • Construction, network fabric, fire & life safety
    • Physical and cyber security, server rack architecture
    • Key role shaping Nusantara Smart Data Center in Indonesia's new capital (IKN)
    • MEP
    • Network fabric
    • Fire & life safety
    • Rack architecture

  5. Estella Tech

    Malang, Indonesia

    Senior DevOps Engineer

    Jun 2025 — Feb 2026 · 9 mo

    A data centre from scratch: rack and stack, power, cooling, cabling, then the clusters on top of it.

    • Rack & stack, HVAC/humidity, redundant A+B power, UPS/PDU and structured cabling
    • VLANs and L2/L3 routing; virtual clusters on Proxmox VE
    • Access secured with Tailscale, WireGuard and Nginx; Biznet Gio integration
    • Hosted an official Arch Linux mirror at high-volume uptime
    • Proxmox VE
    • Tailscale
    • WireGuard
    • NGINX
    • Arch Linux
    • Debian

    DevOps Engineer

    Dec 2024 — Jun 2025 · 7 mo

    Hybrid and multi-cloud infrastructure with HA built in at the routing layer.

    • On-prem plus Google Cloud, AWS and Azure under one topology
    • HA systems with HashiCorp Consul, Terraform and Ansible
    • DNS, subnetting, load balancing and reverse proxies with Nginx
    • Kubernetes on EKS/GKE, CI/CD via GitHub Actions and ArgoCD
    • Consul
    • Terraform
    • Ansible
    • EKS
    • GKE
    • ArgoCD
    • Cloudflare

    1 yr 3 mo in total, across 2 roles

  6. Kaizin Digital

    Kaizin Digital Creative

    Yogyakarta, Indonesia

    Site Reliability Engineer

    Apr 2024 — Dec 2024 · 9 mo

    CI/CD reliability and self-healing systems, measured with error budgets rather than vibes.

    • SLO/SLI and error budgets; blameless postmortems that actually cut MTTR
    • HPA/VPA autoscaling on GKE for zero-downtime traffic spikes
    • Canary deploys with automatic rollback driven by Prometheus metrics
    • Toil automated away in Go and Bash
    • GKE
    • Prometheus
    • Go
    • Bash
    • Argo Rollouts

    Platform Engineer

    Oct 2023 — Apr 2024 · 7 mo

    Scalable, self-healing cloud infrastructure for web platforms — IaC and container orchestration from day one.

    • HA hosting, deployment pipelines and backend optimisation
    • Event-driven workflows and API integrations for zero-downtime operations
    • Containerised environments on GKE, provisioned with Terraform
    • Observability with OpenTelemetry, Prometheus, Jaeger and Grafana
    • GKE
    • Terraform
    • OpenTelemetry
    • Prometheus
    • Jaeger
    • Grafana

    1 yr 3 mo in total, across 2 roles

  7. Sseven Inc.

    Sseven Indonesia

    Batang, Indonesia

    Platform Engineer

    Oct 2022 — Jul 2023 · 10 mo

    Where it started — the first platform, the first pipeline, the first 3AM page.

    • Deployment automation and environment standardisation
    • Operational tooling that replaced spreadsheets with scripts
    • Docker
    • Linux
    • Bash
    • CI/CD

    ここから始まりました 〜 it started here

Certifications

Fun 2026 fact: under CNCF's CARE programme, passing CKS now auto-extends my CKA. 🎁

held today

  • Good Automated Manufacturing PracticeGAMP
  • Professional HVAC Systems: Design, Application & Efficiency
  • Physical Infrastructure Management
  • Fire Safety Awareness
  • ClickUp NoviceClickUp

held, renewing, or hunting next

Cloud Native

The cluster ones. CKS is the gate I care about most.

  • CKA
  • CKS
  • CKAD
  • KCNA
  • KCSA
  • CGOA
  • CAPA
  • PCA
  • ICA
  • CCA
  • OTCA
  • CBA

Cloud

One professional-tier per provider, so no cloud is a stranger.

  • AWS SAP
  • AWS DOP
  • AWS SCS
  • GCP PCA
  • GCP DevOps
  • AZ-104
  • AZ-400
  • AZ-500
  • Terraform Assoc.
  • Vault Assoc.

Linux

Because everything else is a wrapper around this.

  • RHCSA
  • RHCE
  • LFCS
  • LFCE

Security

Offensive first — you can't defend a box you've never broken.

  • OSCP
  • OSEP
  • CISSP
  • CCSP
  • GCIH
  • GCIA
  • Security+

Honours & awards

Mostly from before the pager. Old habits.

  • Gold MedalNational Mathematics & Science Olympiad
  • 3rd PlaceNational Informatics Olympiad
  • FinalistSuprarational Mathematics Competition
  • AppreciationData Scientist Competition
  • AwardeeKospin Jasa Outstanding Student Award

Education

University of Brawijaya

ブラウィジャヤ大学

Bachelor, Computer Engineering

2024 — 2028

Still enrolled — coursework by day, clusters by night.

Out in the open

Things I keep running that nobody pays me for.

  • Official Arch Linux mirror

    Operator

    Ran a public Arch mirror on Estella's own iron, at high-volume uptime. Free bandwidth for strangers, which is the whole point.

  • Open source

    Maintainer

    Tenki Weather ships MIT-licensed, source and all — including the multithreading batch pipeline people keep asking about.

  • Lab infrastructure, donated

    Head of Infrastructure

    25+ internal OSS services stood up for a university research lab so students get real CI/CD, IAM and observability instead of screenshots.

Off the clock

The part of the CV nobody asks for and everybody actually reads.

  • the dish

    Okonomiyaki

    お好み焼き

    Whatever you like, grilled. A dish that lets you be picky on purpose — finally, a system designed for me.

  • the drink

    Matcha

    抹茶

    Whisked, not stirred. Powers roughly 80% of all incident response I have ever performed.

  • the cat

    Sora

    そら

    My cat. Walks across the keyboard mid-deploy. Has never once been blamed in a postmortem.

  • the character

    Loki

    Marvel, and it was never close. Chaotic, over-engineered, weirdly competent. I see myself in the logs.

    • Marvel, always
  • the anime

    One Piece

    One Piece for the long haul, Hunter x Hunter for the arcs that rewire you, Bleach for the drip.

    • Hunter x Hunter
    • Bleach
  • on repeat

    YOASOBI

    YOASOBI and Sayuri when I'm building. My Chemical Romance and Queen when it's already on fire.

    • Sayuri
    • My Chemical Romance
    • Queen
  • the escape

    Scuba diving

    Forty minutes where absolutely nobody can page me. The only true maintenance window.

  • the discipline

    Archery

    Same skill as a good postmortem, really: aim carefully, release cleanly, then go look at where it landed.

Known issues

Full disclosure, in case we end up on the same on-call rota.

Hills I will die on

I will defend every one of these, cheerfully, for longer than you want.

Windows Serverいやだ (nope)Don't know her.SELinuxenforcingPermissive is a rumour.OpenTofu vs TerraformbothListing one is ideology. Listing both is seniority.It's DNSalwaysThere's no way it's DNS. It was DNS.wrklies to youCoordinated omission is real. Use wrk2.PostgreSQLmy one true databaseI tune autovacuum recreationally.

Languages I speak

  • Japanese

    日本語

    Native

  • Indonesian

    Bahasa Indonesia

    Native / bilingual

  • Javanese

    ꦧꦱꦗꦮ

    Native / bilingual

  • English

    English

    Full professional

  • YAML

    yaml

    Fluent, regrettably

My machines

Yes, the terminal is pink. No, I will not be taking questions.

ren@sanctuary — zsh

ren@sanctuary ~ $ neofetch --kawaii  ╭───────────────────╮   OS      Arch Linux  (btw)  │   ∧,,,∧           │   Daily   macOS + nix-darwin  │  ( ̳• ·̫ • ̳)  ~♡    │   Server  RHEL · Debian · Talos  │  /    \>          |   Redteam Kali  (own VLAN, responsible adult)  ╰───────────────────╯   Shell   zsh + starship + tmux + nvim  Uptime  99.99%          Theme   pink, obviously 🌸  Windows ✗ nemesis       Mood    ✧*｡٩(ˊᗜˋ*)و✧*｡
OS
Arch Linux((btw))
Daily
macOS + nix-darwin
Server
RHEL · Debian · Talos
Redteam
Kali(own VLAN, responsible adult)
Shell
zsh + starship + tmux + nvim
Theme
pink, obviously

Okay, your turn.

Tell me what you are running, what keeps breaking, and whether you have strong feelings about okonomiyaki.

say hi