Sanjin Osterman · IT Infrastructure & Systems
Senior IT Engineer & Infrastructure Architect for reliable IT infrastructure
Design, implementation, operation and continuous development of complex IT infrastructures – from Linux and Windows servers to mail, web and network services, virtualization and high-availability systems. Remote across Europe, on-site by arrangement.
IT Infrastructure Consulting
Linux, Servers, Networks, Mail & High Availability
Hands-on support for companies, IT service providers and agencies in infrastructure architecture, migration, operations, scaling and systematic root-cause analysis.
- Remote-first across Europe
- Travel by arrangement
- Project-based or long-term
Focus
Linux & Server Administration
Focus
Mail & Web Infrastructure
Focus
Network, VPN & Security
Focus
Virtualization & High Availability
IT Infrastructure Services
Plan. Build. Operate. Optimize.
Project-based support for companies, IT service providers and agencies – focused on reliable infrastructure, clear technical ownership and clean implementation.
Plan infrastructure
Architecture, technical concepts, dependencies, scaling and robust migration paths for server, network, mail and web systems.
Build systems
Linux and Windows servers, networking, mail, web, databases, virtualization and high-availability components.
Operate infrastructure
Stability, monitoring, backup, security, documentation and continuous technical development of production systems.
Optimize systems
Server migration, automation, performance analysis, scaling and systematic root-cause analysis for complex infrastructure issues.
Core expertise
Linux, Servers, Networks, Mail, Web, Virtualization & High Availability
Broad, hands-on expertise in modern IT infrastructure. The focus is on stable, secure and scalable systems and clean integration across servers, networks, mail, web, database and storage services.
Linux Infrastructure
- Debian Linux
- Linux System Administration
- Shell Scripting
- Automation
Windows Server & Active Directory
- Active Directory
- Windows Server
- Group Policy
- Core Services
Mail Infrastructure
- Microsoft Exchange
- Postfix / Dovecot
- SMTP / IMAP
- TLS
Web Infrastructure
- Apache
- HAProxy
- Reverse Proxy
- Scaling
Network & Security
- Cisco ASA
- VPN / Routing
- Firewalls
- TCP/IP
Virtualization
- Virtual Machines
- Hypervisor Environments
- Resource Planning
- Operations
Databases
- MariaDB / MySQL
- Database Administration
- Performance
- Integration
High Availability
- DRBD
- Pacemaker / Corosync
- GlusterFS
- Failover
Server Migration
Infrastructure Architecture
Infrastructure Troubleshooting
Monitoring
Backup
Automation
Performance Optimization
System Integration
Projects & Experience
Selected experience in IT infrastructure and systems engineering
Long-term hands-on responsibility for production IT systems, server environments and complex infrastructure projects.
– present
Senior IT Engineer / Infrastructure Architect
- Design, implementation, operation and continuous development of the IT infrastructure.
- Linux and Windows servers, Active Directory, Microsoft Exchange, web, mail, database and virtualization environments.
- Network, firewall and VPN infrastructures as well as multi-site systems.
- High availability with HAProxy, DRBD, Pacemaker, Corosync and GlusterFS.
- Migrations, backup, monitoring, automation, fault analysis and performance optimization.
–
IT Infrastructure Project
- Design, planning and implementation of a centralized IT infrastructure.
- Active Directory, Microsoft Exchange, file servers, web servers, and Linux and Windows systems.
- Design, implementation and operation of complete email and web server infrastructures.
- Planning and operation of virtualized server environments.
–
Hotel Management Software Implementation
- Implementation and technical operation of hotel management software on Linux servers.
- Database setup and administration.
- Integration of communications and network infrastructure.
- Installation, system integration, operation and technical support.
Working model
IT Infrastructure Consulting – remote and project-based
Senior IT Infrastructure Specialist for companies, IT service providers and agencies. Focused on complex infrastructure, migrations, reliable operations, technical development and systematic problem solving.
Remote projects
Project-based collaboration
Long-term technical cooperation
Migrations & infrastructure projects
On-site work by arrangement
Certification
Cisco Certified Network Associate
CCNAVerified Cisco certification focused on networking fundamentals, routing and switching. Certified in 2018.
Languages
- German
- English
- Croatian
- Dutch
Availability
- Remote across Europe
- Travel by arrangement
- Project-based or long-term
- Remote-first
Contact & collaboration
Complex IT infrastructure needs clear ownership.
Available for remote projects, project-based collaboration, server migrations, infrastructure troubleshooting and long-term technical cooperation.
Sanjin Osterman
Hahngasse 16 · 2763 Muggendorf · Austria
contact@sanjinosterman.com ·
+43 664 101 94 98