I'm
Umar

Five years building and running infrastructure — CI/CD, Kubernetes, Terraform, and bare-metal virtualisation.

Umar Sabirin

I build and run the infrastructure other teams ship on.

DevOps · SRE
Platform · Cloud

Demo replies
Summary

Infrastructure is the product I care about.

I build and run the infrastructure other teams ship on. Five years across DevOps, SRE, platform and cloud — pipelines, Kubernetes, Terraform, and bare-metal virtualisation. Most of it in Go and Linux, close to the kernel and close to the network. What I actually optimise for is boot time, pipeline time, and a quiet pager.

2sVM cold boot~300% faster than Proxmox
19,400concurrent streamsgRPC + SSE from 194 agents
−83%CI stage timeJenkins · Terraform · Ansible
2,683req/s sustainedevent-driven on Kafka
Work experience

Where I've been, and what changed while I was there.

Four roles, moving steadily from writing services toward running the platforms they live on. Every number below is something I measured myself, in production.

  1. 2026 — now Apple Dev Institute × S-Quantum Tangerang Selatan

    DevOps Engineer

    • Built the Jenkins pipelines that ship Terraform and Ansible, with lint, plan, test and security gates in front of every apply.
    • Cut pipeline stage time by roughly 83% through parallelisation and caching.
    • Standardised how teams get infrastructure, so nobody hand-rolls a VM any more.
  2. 2025 — 2026 Maxcloud Jakarta

    Backend / Platform Engineer

    • Wrote a Go orchestrator that speaks QMP straight to QEMU/KVM with no libvirt in the path — cold boot went to 2 seconds, about 300% faster than the Proxmox setup it replaced.
    • Multiplexed 19,400+ concurrent gRPC and SSE streams from 194 agents in a single Go service.
    • Built load balancing as a service on HAProxy and nftables, cutting network provisioning time by about 40%.
    • Took tenant branding deploys from 45 minutes to under 5 seconds.
  3. 2023 — 2025 Freelance Remote

    Software Engineer

    • Event-driven microservices on Kafka holding 2,683 requests per second.
    • Multi-gateway payment failover, so one provider going down stopped taking checkout with it.
  4. 2021 — 2023 Fairtech Pte Ltd Singapore, remote

    Software Developer

    • Rebuilt multi-tenant queries for roughly 50% better performance.
    • First job where I had to run what I wrote — that is what pushed me toward infrastructure.
2020 — 2025 BSc Information Systems Hasanuddin University GPA 3.82 / 4.00
Skills

Four things I'm genuinely good at.

Grouped by what I actually do with them rather than by tool name — the tools are in the next section.

Distributed systems

Go services under real concurrency — gRPC, SSE, event-driven work on Kafka and RabbitMQ, and multi-tenant data models that stay fast as tenants pile up.

Reliability

Prometheus, Grafana, Loki and OpenTelemetry wired in from the start. SLOs that mean something, alerts that fire for a reason, and post-incident notes people actually read.

Delivery

Jenkins and GitHub Actions driving Terraform, Ansible and Packer. Every environment reproducible from a repo, every change reviewable before it lands.

Systems & networking

QEMU/KVM and QMP, cloud-init, PXE, HAProxy and nftables. Comfortable below the container layer, where most people stop looking.

Where I'm not strong, so you don't find out later: Java and Spring Boot are intermediate for me and I have never used Hibernate. My English is intermediate — fine in writing and in a technical conversation, still catching up in a fast meeting.

Tech stack

What's actually on my machine.

Split honestly: the first row is what I touch most weeks, the second is what I reach for when a project needs it.

Daily
  • Go
  • Linux
  • Docker
  • Kubernetes
  • Terraform
  • Ansible
  • QEMU/KVM
  • Prometheus
  • Grafana
  • PostgreSQL
Comfortable
  • AWS
  • Jenkins
  • GitHub Actions
  • Kafka
  • RabbitMQ
  • Redis
  • Elasticsearch
  • HAProxy
  • Vault
  • Trivy
Roles

What I'm looking for next.

Any of these four, at a team that runs its own infrastructure rather than outsourcing the interesting parts.

01

DevOps Engineer

Pipelines, infrastructure as code, and the delivery path teams use every day.

02

Site Reliability Engineer

SLOs, observability, capacity and incident response for systems that have to stay up.

03

Platform Engineer

Internal platforms and self-service infrastructure, so product teams stop filing tickets.

04

Cloud Engineer

AWS and hybrid networking, with cost and security treated as design constraints.

Open to work

Tangerang Selatan, Indonesia. Remote welcome.

One month notice. Happy to talk through any of the numbers on this page in detail — or ask the character up top.