Caesarico Bayu Sejati.
IT Infrastructure & Cybersecurity student · Linux, networking & DevOps · Sidoarjo, East Java
// about
## Hello, world. I am Bayu.
My name is Caesarico Bayu Sejati — a twelfth-grade Computer and Network Engineering student at SMK Darma Siswa 1 Waru, Sidoarjo, East Java. I specialise in IT infrastructure and cybersecurity: configuring networks, administering Linux servers, and learning how to secure the systems I build.
From bare-metal servers and virtual machines to containerised deployments and CI/CD pipelines — I like getting my hands dirty with the parts of tech most people never look at. Always learning, always building, always shipping.
Based in Sidoarjo, East Java, Indonesia, I am open to IT infrastructure, network engineering and DevOps internships, and always happy to talk shop about Linux or networking.
- lab uptime
- 3+ yrs
- shells opened
- 12k
- coffee
- ∞
// projects
## Things I built when I should've been sleeping
CSRG PENS Web Profile
React and Tailwind web profile for the Cyber Security Research Group at Politeknik Elektronika Negeri Surabaya, served with Nginx and Docker. Built and shipped during my internship.
Self-Hosted Homelab on Proxmox
Self-hosted Linux lab: Proxmox nodes, Ubuntu servers, Kali VMs and a pi-hole gateway. Containerised services, reverse proxies and automated backups run on it daily.
Docker CI/CD Pipelines on Kubernetes
Containerised services built with multi-stage Dockerfiles and shipped through GitHub Actions CI/CD pipelines — build, test and deploy on every push, rolled out to a k3s cluster with zero-downtime releases.
Virtual Network Lab & Threat Modelling
Virtual network topologies built in GNS3 and Packet Tracer for practising TCP/IP routing, VLANs, firewall rules and server deployment — then attacking them with Nmap and Wireshark to see what leaks.
// stack
## What's in my .bashrc
systems
- › linux (ubuntu, kali)
- › bash / cli
- › sysadmin
- › termux
networking
- › tcp/ip
- › vlan / routing
- › firewall rules
- › DNS
servers
- › virtualization
- › proxmox
- › ubuntu server
- › ssh hardening
security
- › threat analysis
- › OSINT Enthusiast
- › wireshark
- › nmap
web
- › html
- › css
- › javascript
- › git
devops
- › docker / containers
- › kubernetes
- › ci/cd pipelines
- › github actions
- › nginx / reverse proxy
// experience
## git log --oneline --career
-
a1f90c2 Intern@PT E-T-A Indonesia
Senior-year internship supporting IT operations — applying networking, Linux system administration and infrastructure troubleshooting skills inside a real industrial environment.
-
7d3b1e8 Web Developer & Intern@CSRG PENS
Worked with the Cyber Security Research Group at Politeknik Elektronika Negeri Surabaya, contributing directly to the development of their web profile.
-
0c2be44 Homelab, DevOps & Security Research@localhost
Most of my free time goes to Linux: managing virtual machines, containerising services with Docker, wiring up CI/CD pipelines for automated builds and deployments, and building virtual labs to practise server deployment, administration and infrastructure automation.
// contact
## Open a connection
I read every email. Hiring an intern in IT infrastructure, networking or DevOps? Just want to nerd out about Linux or Vim?