#Project Overview
During my tenure at PT Citra Jelajah Informatika, I gained comprehensive experience in enterprise infrastructure management and network engineering. This role involved designing, implementing, and maintaining complex server and network systems across diverse environments including office buildings, shopping malls, schools, and hotels.
The experience encompassed full-stack infrastructure responsibilities, from DNS and web server management to network monitoring and virtualization, ensuring high availability, security, and optimal performance across all systems.
#Role & Responsibilities
#System Administrator (Jun 2023 - Oct 2023)
As a System Administrator, I was responsible for:
- Installing, configuring, and maintaining a wide range of server services
- Ensuring high availability, security, and optimal performance
- Managing monitoring and observability systems
- Handling hosting control panels for server and account management
- Managing virtualization environments
#Network Engineer (Jun 2021 - Jun 2023)
As a Network Engineer, I focused on:
- Analyzing, designing, and implementing network infrastructure
- Working as an Engineer On-Site (EOS) for installation and maintenance
- Managing wireless and networking devices
- Operating within a Network Operation Center (NOC) environment
- Performing continuous network monitoring and performance analysis
#Server Infrastructure Management
#DNS Services
Managed authoritative DNS services using industry-standard solutions:
- PowerDNS: High-performance DNS server with advanced features
- BIND: Traditional DNS server for complex DNS configurations
These services ensured reliable domain name resolution and DNS failover capabilities across the infrastructure.
#Web Servers
Deployed and maintained multiple web server solutions:
- Apache: Full-featured web server with extensive module support
- Nginx: High-performance reverse proxy and web server for load balancing
Both servers were configured for optimal performance, security, and scalability depending on workload requirements.
#Database Services
Managed multiple database systems:
- MySQL/MariaDB: Relational database management for application data
- MongoDB: NoSQL database for flexible data storage requirements
Ensured data integrity, backup strategies, and performance optimization for both systems.
#Mail Services
Implemented complete mail server stack:
- Postfix: Mail transfer agent (MTA) for reliable email routing
- Dovecot: IMAP/POP3 server for mail access
- Roundcube: Web-based mail client for user access
This combination provided a complete, secure, and user-friendly mail infrastructure.
#Hosting Control Panels
Managed server administration through:
- cPanel: Industry-standard hosting control panel
- CentOS Web Panel (CWP): Open-source alternative for server management
These panels streamlined account management, domain configuration, and resource allocation.
#Monitoring & Observability
Implemented comprehensive monitoring solutions to ensure infrastructure reliability:
- Grafana: Visualization and dashboarding platform
- Prometheus: Time-series metrics collection and alerting
- Cacti: Network monitoring and graphing tool
- PRTG: Network monitoring and bandwidth analysis
- Zabbix: Enterprise monitoring solution
- The Dude: Network topology and monitoring tool
These tools provided real-time visibility into system performance, enabling proactive issue detection and rapid response to infrastructure problems.
#Virtualization Management
Managed virtualization environments for efficient resource utilization:
- Proxmox: Open-source virtualization platform for VM and container management
- VMware ESXi: Enterprise hypervisor for large-scale virtualization
Deployed, maintained, and optimized virtual machines to support various workloads and ensure business continuity.
#Network Infrastructure
#Network Design & Implementation
Designed and implemented network infrastructure across diverse environments:
- Office buildings
- Shopping malls
- Schools
- Hotels
Each environment required tailored network solutions considering scalability, security, and performance requirements.
#Networking Devices & Technologies
Managed a diverse range of networking equipment:
- Wireless: Ruijie, Ubiquiti (UniFi), TP-Link
- Routers & Switches: Mikrotik, Cisco, Arista
- Core Technologies: VLAN, WAN, LAN, Wireless networking
#Network Operation Center (NOC)
Operated within a NOC environment handling:
- Network monitoring and troubleshooting
- Modem registration using GPON OLT ZTE
- Real-time network issue resolution
- Performance analysis and optimization
#Network Monitoring
Performed continuous network monitoring using:
- The Dude: Network topology visualization and monitoring
- Zabbix: Enterprise network monitoring
- Cacti: Network traffic graphing and analysis
These tools ensured network reliability, stability, and optimal performance across all environments.
#Key Achievements
- Successfully managed enterprise infrastructure supporting multiple business units
- Implemented comprehensive monitoring solutions reducing mean time to resolution (MTTR)
- Designed and deployed network infrastructure across diverse environments
- Maintained high system availability and security standards
- Managed virtualization environments supporting hundreds of virtual machines
- Coordinated with cross-functional teams to ensure infrastructure reliability
#What I Learned
Through this experience, I gained:
- Deep understanding of enterprise infrastructure architecture
- Hands-on experience with industry-standard server and networking tools
- Proficiency in monitoring and observability best practices
- Network design and implementation skills
- Virtualization and resource management expertise
- Ability to work in fast-paced, production environments
- Problem-solving skills in complex infrastructure scenarios
#Why This Experience Matters
This role was instrumental in developing my DevOps and infrastructure engineering skills. It provided practical experience in:
- Managing production systems with high availability requirements
- Implementing monitoring and observability solutions
- Designing scalable network infrastructure
- Working with diverse technologies and platforms
- Maintaining security and performance standards
#Conclusion
My experience at PT Citra Jelajah Informatika provided comprehensive exposure to enterprise infrastructure management and network engineering. This foundation has been crucial in developing my DevOps mindset and understanding the importance of reliable, secure, and well-monitored infrastructure in supporting business operations.
