Systems Administrator

Secure Sites

Salary: Competitive

Location: Porto Salvo, Portugal

Posted: 11 Feb 2020

Main Purpose of the role 

We're developing and operating Consumer and M2M Remote SIM Provisioning platforms deployed in several locations globally. These platforms are used to securely provide and manage eSIM profiles that are made available for devices to utilize. The platform serves several critical applications and hosts hundreds of millions of profiles in a security intense environment. The secure site team deploys and manages the secure sites including datacenter, compute, storage, network, firewalls, secure access, secure logging, HSMs, backup and restore, deployment procedures and pipelines. The secure site team is reponsible for deployment of a fully functional site that can be audited and certified for live operation. We truly care about our customers and worry about functional and non-functional scope in a highly collaborative and diverse environment.

Key Responsibilities

The Systems Administrator designs, deploys and maintains the secure site infrastructure.

  • Deploy and maintain new secure site platorms to fully working functional level and ready for audit;
  • System hardening, working with our security team and using CIS standard;
  • Create and maintain detailed up to date documentation;
  • Ensure full visibility for system and application;
  • Maintain high hardening and security levels for all systems and their audit trail;
  • Perform daily system monitoring, verifying the integrity and availability of all hardware, server resources, systems, data and key processes, reviewing system and application logs, and verifying completion of scheduled jobs such as backups;
  • Maintain OS patches and upgrades release review on a regular basis;
  • Troubleshoot reported problems;
  • Create build and deploy systems to quickly respond to business requirements.


  • Experience in administration of Red Hat Linux/CentOS;
  • Experience in systems hardening and security management, IPTables, SELinux;
  • Experience in administration of virtualized environments based on VMware ESXi;
  • Administration of storage systems like NetApp;
  • Working knowledge of Infrasctructure as Code and related tools such as terraform, ansible or puppet;
  • Management and use of CI/CD systems and pipelines like Gitlab;
  • Containerizing App/services with Docker;
  • Managing logging systems lioke Graylog or ELK;
  • Monitoring technology like Prometheus, OpenNMS, Nagios;
  • Management of proxies, web servers and load balancers, like Squid, NGINX and HAProxy;
  • Working knowledge of scripting technology;
  • Experience managing IAM systems like OpenLDAP, Active Directory and Bind DNS;
  • Understanding of essential TCP/IP protocols: TCP, UDP, ICMP, SMTP, SNMP, LDAP, DNS, NTP and others;
  • Understanding of fundamental hardware concepts: disk, memory, CPU, NIC, HBA, firmware, RAID, performance concepts (I/O, paging, swapping, system calls), iSCSI, Fiber Channel, Ethernet;
  • Ability to present ideas in user-friendly language;
  • Good interpersonal, oral and written communication skills;
  • Ability to work on many tasks simultaneously in a high-pressure environment;
  • Self-motivated and directed, with keen attention to detail.

  • Apply now

    No agencies. We do not accept CVs from 3rd parties

    Apply now

    No agencies. We do not accept CVs from 3rd parties