About the Role 

We are looking for a highly skilled L4 Senior Infrastructure Architect with deep expertise in Linux systems, OpenStack cloud platforms, and open-source hosting environments. This is a senior individual contributor position focused on architecture, complex problem solving, and handling P0/P1 incidents. 

You will drive infrastructure design, troubleshoot critical issues, and guide technical best practices across Linux, OpenStack, cloud platforms, and hosting services. 

Key Responsibilities 

• Architect, configure, and manage multi-tenant web hosting environments using WHM/cPanel, Cloud Linux, Lite Speed, and related hosting technologies.
• Perform advanced WHM administration including account provisioning, package/resource management, DNS zone configuration, security hardening, and backup strategy design.
• Manage cPanel environments end-to-end: domain management, SSL/AutoSSL setup, database administration, file systems, and resource optimization.
• Configure and manage mail servers (Exim, Dovecot) within WHM/cPanel including: 
  – Email routing and mailbox provisioning.
  – SMTP/IMAP/POP configuration.
  – Spam filtering (SpamAssassin), greylisting, and outbound spam protection.
  – DKIM, SPF, DMARC setup and maintenance.
  – Secure mail transfer configuration (TLS/SSL).
  – Troubleshooting deliverability issues and resolving RBL/blacklist incidents.
  – Monitoring and improving server IP/domain reputation.
• Troubleshoot complex hosting issues involving Apache/LiteSpeed, PHP-FPM, MySQL/MariaDB, DNS, mail delivery, and performance bottlenecks.
• Execute lifecycle management: OS patching, kernel updates, PHP version upgrades, CMS/plugin updates, and dependency management in coordination with dev teams.
• Implement and maintain hosting security controls: ModSecurity/WAF rules, brute-force protection, malware scanning, IP filters, CageFS/Cloud Linux account isolation.
• Ensure high availability through proactive monitoring, log analysis, performance tuning, and capacity planning for hosted workloads.
• Lead P0/P1 incident response, perform RCA, and implement corrective actions to enhance platform stability.
• Oversee automated backup/restore processes for websites, databases, and email data; ensure DR readiness.
• Support deployments and maintenance of CMS platforms (WordPress, Drupal, Joomla, Magento, etc.) across shared and dedicated hosting environments.
• Drive operational efficiency through automation, scripted maintenance tasks, and continuous improvement aligned with PITS’ Kaizen principles. 

People 

• Mentor junior engineers and administrators, providing technical direction and code reviews.
• Collaborate with developers to ensure smooth deployment and performance optimization.
• Partner with cybersecurity and product teams for secure architecture design.
• Act as escalation point for complex production incidents. 

Required Skills & Experience 

7 – 10 years of hands-on Linux systems engineering and cloud infrastructure experience. 

Deep proficiency in:

• Linux (Ubuntu, CentOS, RHEL)
• OpenStack services (Nova, Neutron, Keystone, Glance, Cinder, Swift)
• Apache, Nginx, PHP-FPM
• MySQL/MariaDB, PostgreSQL
• WordPress, Magento, Drupal

Strong understanding of:

• Networking: DNS, VLANs, load balancers, routing, SSL/TLS.
• DevOps tools: Docker, Ansible, Terraform, Git, Jenkins.

Security hardening and compliance:

• Experience designing hybrid/multi-cloud architectures.

Preferred Qualifications 

• Certifications: RHCE, OpenStack Administrator, AWS/Azure Architect.
• Experience with containerization (Docker, Kubernetes).
• Exposure to monitoring and log analytics (ELK, Prometheus, Grafana).
• Familiarity with compliance frameworks (ISO27001, SOC2, PCI DSS).

Soft Skills 

• Strong problem-solving and analytical skills.
• Excellent communication and documentation abilities.
• Ability to lead cross-functional teams and manage complex environments.
• Passion for open-source technologies and continuous learning.

Equal Opportunity Statement

• We value diversity and inclusion. As an equal opportunity employer, we welcome applicants from all backgrounds and walks of life.