Sr. Linux & OCI Administrator (Oracle Linux / RHEL)

 

At Mitratech, we are a team of innovators focused on building world-class products that simplify operations in the Legal, Risk, Compliance, and HR functions. We are a close-knit, globally dispersed team that thrives in an ecosystem that supports individual excellence and takes pride in its diverse and inclusive work culture centered around great people practices, learning opportunities, and having fun! Our culture is the ideal blend of entrepreneurial spirit and enterprise investment, enabling the chance to move at a rapid pace with some of the most complex, leading-edge technologies available.

For over 35 years, the experts at Mitratech have been focused on solving the complex needs. Today, we serve 20,000 client companies of all sizes globally, representing 30% of the Fortune 500 and over 500,000 users in over 160 countries.

As we continue to grow, we’re always looking for resourceful, enthusiastic, and fresh perspectives. Join our global team and see what makes Mitratech a truly exceptional place to work!

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.

Essential Duties & Responsibilities:

• 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

Requirements & Skills:

• 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 WebLogic Server
• Working knowledge of Oracle Database environments
• IaC & Automation: Deep proficiency with Terraform (modules, workspaces, remote state, testing) and Ansible (roles, collections, idempotency, vault).
• Systems Expertise:
• Kernel, systemd, SELinux/AppArmor, LVM/filesystems (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.

Nice to Have (Preferred)

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

Preferred Qualifications

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

Soft Skills

• 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 Recruiting@mitratech.com to request an accommodation.