Sr. Infrastructure & Security Engineer

We are seeking a highly skilled Senior Infrastructure & Security Engineer to join our infrastructure team. This role is critical to ensuring the reliability, scalability, and security of our hybrid cloud environment. You will act as a bridge between development and operations, with a strong focus on automation, security, and system resilience. Your expertise will guide the team in maintaining high-availability systems while continuously improving our infrastructure-as-code practices.

Key Responsibilities

1. Infrastructure & OS Management

• Manage and maintain Linux-based systems (Rocky Linux, CentOS, RHEL) in production and staging environments.
• Perform kernel patching, security updates, and system hardening following industry best practices.
• Troubleshoot and debug complex OS-level issues (performance, memory, I/O, kernel panics).
• Manage and support Windows Server environments where applicable.
  
  
  

2. Security & Compliance

• Perform regular security scanning and vulnerability assessments using tools like Nessus, Qualys, or OpenVAS.
• Conduct code security scans (SAST/DAST) and integrate them into CI/CD pipelines.
• Configure and maintain LDAP authentication for centralized access management.
• Ensure all systems comply with internal security policies and external regulatory standards.
• Implement and manage WAF (Web Application Firewall) configurations to protect against OWASP Top 10 threats.
  
  
  

3. Automation & Configuration Management

• Write and maintain Ansible playbooks for automated provisioning, patching, and configuration management.
• Manage GitHub Enterprise repositories, branching strategies, and CI/CD workflows (GitHub Actions preferred).
• Develop automation scripts using Python, Shell, or Go to reduce toil and improve operational efficiency.
  
  
  

4. Application & Web Server Management

• Configure and maintain Apache and Nginx web servers, including performance tuning and reverse proxy setup.
• Troubleshoot web server logs, SSL/TLS issues, and load balancing configurations.
  
  
  

5. Container Orchestration & Cloud-Native Technologies

• Deploy, manage, and scale applications on Kubernetes clusters (EKS, AKS, or on-prem).
• Build and maintain Docker images with secure base layers and minimal attack surfaces.
• Monitor cluster health, resource usage, and implement auto-scaling policies.
  
  
  

6. Monitoring & Incident Management

• Deploy and maintain monitoring tools (Prometheus, Grafana, Datadog, or ELK stack).
• Define SLIs, SLOs, and error budgets; drive blameless post-mortems.
• Participate in on-call rotations and lead incident response efforts.
  
  
  

Required Skills & Experience

Category

Must-Have

OS

Expert in Rocky Linux, CentOS, RHEL (6+ years); Windows Server experience

Security

WAF, vulnerability scanning, LDAP, OS hardening, kernel patching

Automation

Ansible (playbooks, roles, AWX/Tower), Python/Shell scripting

CI/CD & SCM

GitHub Enterprise administration, GitHub Actions, branch protection rules

Containers

Docker (build/security scanning), Kubernetes (deployment, networking, storage)

Web Servers

Apache, Nginx (configuration, SSL, reverse proxy)

Monitoring

Prometheus, Grafana, ELK, or commercial tools (Datadog/New Relic)

Code Security

SAST/DAST tools (SonarQube, Snyk, Checkmarx)

Preferred Qualifications

• 8+ years in SRE, DevOps, or Systems Engineering roles.
• Experience with Terraform or other IaC tools.
• Familiarity with service mesh (Istio/Linkerd) and CNI plugins (Calico/Cilium) or similar.
• Understanding of zero-trust networking and SSO integrations.
• Certifications: RHCE, CKA, or CISSP are a plus.