Senior Systems Administrator – Windows & Linux

About the Company

For over 30 years, this global technology innovator has been shaping the future of public mobility by delivering world-class hardware and software solutions for the transport and ticketing industry. Operating in over 500 cities worldwide, their platforms improve commuter access and drive smarter mobility outcomes for cities and transit providers.

With a deep focus on cloud-native innovation, digital transformation, and embedded system security, this is a business where clever thinking and technical excellence are celebrated. You’ll be joining a close-knit team of engineers, developers, architects, and problem-solvers united by a shared mission: simplifying transport for the world, one system at a time.

If you’re someone who thrives in a “challenge the status quo” environment and wants to use your infrastructure and system expertise to make global impact—this is the place to do it.

About the Role:

We’re looking for a Senior Systems Administrator with hands-on experience managing hybrid infrastructures across Windows Server, Linux, and AWS platforms.

In this critical role, you will take ownership of the core IT systems—ensuring high availability, security, performance, and scalability across the organisation’s infrastructure landscape. From OS configuration and network setup to SQL database administration and security patching, you’ll work on a diverse technology stack that underpins mission-critical software serving international markets.

This is a hands-on engineering role requiring deep technical skills and the ability to manage both on-prem and cloud-based systems. You will also lead disaster recovery strategies, performance tuning, automation efforts, and system upgrades.

Key Responsibilities

System Administration

• Manage and maintain Windows Server environments (2012–2022) including Active Directory, patch management, and GPO
• Administer Linux-based servers (Ubuntu, Red Hat, CentOS) including installation, configuration, shell scripting, and hardening
• Design and maintain secure network topologies, including firewall rules, VLANs, DNS, DHCP, VPNs, and network segmentation

Web Server Management

• Configure, secure, and optimise Apache and IIS web servers
• Troubleshoot web hosting environments to ensure high availability and rapid response time
• Support integration with application deployment and DevOps teams

Database Administration

• Manage Microsoft SQL Server, including backup and restore operations, Always On availability groups, and index tuning
• Administer Oracle Databases, including RAC, ASM, Data Guard, performance tuning, and schema optimisation
• Ensure all databases are highly available, regularly patched, secured, and monitored

Cloud Infrastructure (AWS)

• Architect, deploy, and manage cloud resources using AWS services such as:
• EC2, RDS, S3, IAM, CloudWatch, CloudFormation, and Lambda
• Implement backup, disaster recovery, and cost optimisation strategies across AWS
• Maintain hybrid-cloud environments and assist in cloud migration initiatives

Security and Compliance

• Implement OS- and network-level security controls in line with industry best practices
• Conduct regular vulnerability assessments, penetration testing, and system hardening
• Monitor and respond to alerts, audit logs, and security incidents

Monitoring and Optimisation

• Use tools like CloudWatch, Nagios, Datadog, or similar to track performance, availability, and capacity
• Perform log analysis, load forecasting, and proactive tuning of system parameters
• Ensure infrastructure meets defined SLA/SLO thresholds

Documentation & Reporting

• Maintain detailed documentation of system configurations, patch history, and architecture diagrams
• Generate uptime reports, system health metrics, and cost utilisation dashboards
• Lead internal IT audits and collaborate with compliance teams as required

Troubleshooting & Support

• Act as Tier-3 escalation for critical issues
• Mentor junior engineers and support teams in resolving advanced tickets
• Assist in incident management and post-mortem reviews

Minimum Requirements

• 7+ years of experience as a Systems Administrator or Infrastructure Engineer
• Strong expertise in Windows Server (2012, 2016, 2019, 2022) and Linux distributions (Ubuntu/CentOS/Red Hat)
• Proven ability to configure and maintain Apache and IIS web servers
• Deep experience in SQL Server administration and Oracle database operations
• Extensive hands-on experience with AWS infrastructure and cloud services
• Proficient with networking (TCP/IP, DNS, DHCP, VPNs, VLANs, routing, firewalls)

Preferred Technical Certifications (Not mandatory but advantageous)

• Microsoft Certified: Windows Server Administrator Associate / Expert
• LPIC-2 or LPIC-3 (Linux Professional Institute Certification)
• AWS Certified SysOps Administrator or AWS Solutions Architect
• Oracle Certified Professional (OCP)
• Cisco Certified Network Associate (CCNA)

Soft Skills & Cultural Fit

• Strong analytical and problem-solving ability
• Proactive, detail-oriented, and calm under pressure
• Passion for continuous improvement and operational excellence
• Collaborative, with excellent written and verbal communication skills
• Willingness to contribute beyond job scope when needed
• Committed to building systems that support global scalability and uptime

How to Apply

Send your detailed CV to charne@skillzpage.com with the subject line:

Senior Systems Administrator – Windows & Linux | Global Mobility Tech

Please note: If you do not hear from us within 14 days, consider your application unsuccessful.