Administrador de sistemas Linux Lisboa

Administrador de sistemas Linux
Lisboa
Lisboa, Lisboa, Portugal

Join Us at Closer Consulting!

Mutual Respect, Empathy, Innovation, and Professional Pride. Do you see yourself within these values?

Founded in 2006 with the mission "To Challenge Complexity", Closer Consulting is a Data Science company specializing in Business Intelligence, Advanced Analytics, and Artificial Intelligence.

Developing projects in diverse industries – Banking, Telecommunications, Healthcare, Retail, Energy, Insurance, and Aviation – we have created an environment where the brightest enquiring minds feel at home. We provide our people with the means, opportunities, and support they need to thrive and innovate.

We are seeking a Senior IT Infrastructure Linux professional willing to accept new challenges in our Closer team in a hybrid model in Lisbon.

Key Responsibilities:

Infrastructure & Cloud Management:

• Architect, deploy, and manage hybrid cloud environments (OCI, Azure) with a focus on security, automation, and seamless integration.
• Administer virtualization platforms (VMware v
  Sphere, OLVM) and orchestration tools (Rancher, Kubernetes – RKE/OKE).
• Configure and optimize complex IP networks (120+ prefixes), firewalls (Sonic
  Wall), VPNs (IPSec
  -
  - site), ZTNA, and network segmentation.

Security & Compliance:

• Implement hardening policies for Linux systems (RHEL, Ubuntu, Oracle Linux) and containerized environments (Docker).
• Define and enforce backup, disaster recovery (Veeam), and
  - availability strategies.
• Manage IAM/PAM solutions and ensure compliance with security best practices.

Automation & Dev
Ops Integration:

• Automate provisioning and administration using Ansible, Terraform, and CI/CD pipelines.
• Monitor and optimize performance with Zabbix, Prometheus, Grafana, Loki, Elastic
  APM.
• Lead legacy application modernization (e. g. , JBoss to containers/microservices).

Leadership & Collaboration:

• Mentor junior administrators and promote infrastructure best practices.
• Collaborate with Dev
  Ops and development teams in Agile environments.
• Document architectures, policies, and procedures for knowledge sharing.

Technical Requirements:

Mandatory Expertise:

• Cloud: Oracle Cloud Infrastructure (OCI), Microsoft Azure (Iaa
  S/Paa
  S), hybrid integration.
• Virtualization/Orchestration: VMware v
  Sphere, Kubernetes (RKE/OKE), Rancher.
• Networking: Firewalls (Sonic
  Wall), VPNs, ZTNA, DNS, NTP, reverse proxy (nginx).
• Automation: Ansible, Terraform, CI/CD pipelines.
• Monitoring: Zabbix, Prometheus, Grafana, Elastic Stack.
• Linux Administration: RHEL, Ubuntu, Oracle Linux (security, hardening, Docker).
• Databases: Postgre
  SQL, Oracle
  DB, Redis, My
  SQL, SQL Server.

Soft Skills:

• Strong leadership and mentorship capabilities.
• Agile mindset with
  - functional collaboration experience.

We believe we are the ones to, by:

• Providing a multidisciplinary Team.
• Giving a home office kit with everything you need to perform remotely.
• Ensuring a career plan alongside professional growth.
• Providing you with a custom training plan.
• Helping you reach happiness.

Oh. . . and by the way, we also have:

• Several challenging complex projects.
• Stimulating teams and leaders.
• World-class Clients and Partners.

If you believe in this match as much as we do, send us your CV to and reach the closer side of life.

Closer is a company that values diversity and inclusion. We are committed to fostering an environment where everyone is treated with dignity and respect, regardless of race, gender, beliefs, sexual orientation, physical or mental disability, or other personal characteristics.

At Closer, we embrace the unique perspectives and experiences that everyone brings, and we believe that it is a fundamental driver for the success we've achieved.