Sr. Linux & OCI Administrator; Oracle Linux​/RHEL

Job Overview

We are seeking an experienced Sr. Linux & Oracle Cloud Infrastructure (OCI) Administrator to support a production application hosted on OCI. The role focuses on Oracle Linux administration, OCI networking and security, Terraform-based automation, and operational support for SFTP and mail services.

• Administer and support Oracle Linux systems (patching, tuning, troubleshooting)
• Manage OCI resources: compute, VCNs, subnets, routing, load balancers
• Configure and maintain OCI security (IAM, NSGs, security lists, compartments)
• Design and troubleshoot OCI networking and connectivity issues
• Provision and manage infrastructure using Terraform (IaC)
• Support SFTP and mail services (secure access, monitoring, troubleshooting)
• Perform system monitoring, backup coordination, and DR support
• Participate in production support, incidents, and on‑call rotations
• Maintain operational documentation and runbooks

• 7+ years professional experience administering Linux in production (preferably Oracle Linux or closely related RHEL).
• Strong Hands‑on experience with OCI administration (compute, networking, IAM, security)
• Experience supporting Oracle Web Logic Server
• Working knowledge of Oracle Database environments
• IaC & Automation: Deep proficiency with Terraform (modules, work spaces, remote state, testing) and Ansible (roles, collections, idempotency, vault).
• Systems Expertise:
  • Kernel, systemd, SELinux/App Armor, LVM/file systems (xfs/ext4/btrfs), iSCSI/NFS, SSH/hardening.
  • Package and patch management (yum/dnf, repo mirrors, Ksplice), vulnerability management, and baseline hardening (CIS/STIG).
• Solid understanding of Networking Fundamentals: TCP/IP, routing, DNS, DHCP, load balancing, proxies, firewalls/security groups, PKI/certificates (TLS).
• Scripting: Proficiency in Bash
• Experience with SFTP and SMTP/mail services
• Deployment
  
  Experience:
  
  Comfortable with both modern (immutable, pipelines, containers) and older practices (in‑place upgrades, change windows, maintenance runbooks).
• Troubleshooting: Proven ability to diagnose and resolve complex incidents across OS, network, and platform layers.
• Documentation & Communication: Clear written/verbal communication; ability to author design docs, runbooks, and RFCs.

• Certifications: Oracle Linux,
  OCI Architect Professional/Associate
  , RHCSA/RHCE (or equivalents), Terraform Associate, Ansible Automation.
• Tooling: Packer, Git Hub Actions/Git Lab CI/Azure Dev Ops/Jenkins, Hashi Corp Vault, OCI Bastion/Cloud Guard, Security Zones.
• Containers & Orchestration: Docker, Kubernetes, admission controls, image signing, and runtime policies.

• OCI certifications
• Experience with monitoring tools and CI/CD pipelines
• High availability and disaster recovery experience

• Strong troubleshooting skills
• Ability to work in production‑critical environments
• Good communication and documentation skills

Mitratech is an equal‑opportunity employer that values diversity at all levels. All qualified applicants will receive consideration for employment without regard to race, colour, religion, gender, national or ethnic origin, age, sex, sexual orientation, gender identity or expression, marital status, family status, disability, or veteran status. Mitratech will work with applicants requesting accommodation at any stage of the hiring process. Please email  to request an accommodation.