Senior Systems Engineer (Unix / Linux)

About the role

What makes us who we are today…
At EPiC, we develop innovative and creative products and services that provide total communication and information solutions. Among a plethora of services, web design and development, tailor-made applications, business-to-business applications, and business-to-client applications are a few that we offer. Satisfied clients in Greece and Ireland are a testament to the quality of our work.
The general purpose of EPiC is to develop and promote advanced information technologies for multi-user operation.
EPiC’s business philosophy is to ensure the highest quality product, total client satisfaction, timely delivery of solutions, and the best quality-to-price ratio found in the industry. Our emphasis is on offering a high degree of product user-friendliness through a positive, creative, and focused company staff.

We are looking for a senior engineer to design, operate and secure mission-critical web infrastructure on Red Hat Enterprise Linux and FreeBSD. You will own the Apache web tier and its ModSecurity WAF layer. You will also work at source-code level in C/C++ to customize, extend and troubleshoot the stack.

Responsibilities

• Install, configure and maintain RHEL and FreeBSD servers in production, test and DR environments
• Design and operate high-availability Apache HTTP Server deployments, including virtual hosts, reverse proxying, load balancing, performance tuning
• Deploy and tune ModSecurity (v2/v3) with the OWASP Core Rule Set: write custom rules, manage false positives and analyses audit logs
• Develop, patch and compile Apache modules and system components in C/C++; build packages from source (RPM, FreeBSD ports/pkg)
• Perform OS-level performance tuning, kernel parameter optimization and capacity planning
• Automate provisioning and configuration with Bash/Python and tools such as Ansible
• Support incident response, security audits, and compliance requirements (e.g. ISO 27001, PCI-DSS, DORA)
• Produce technical documentation and runbooks, and mentor junior engineers

Requirements

• 5+ years of hands-on Unix/Linux systems engineering in production environments
• Expert knowledge of Red Hat Enterprise Linux (RHEL 8/9) and its ecosystem
• Expert knowledge of FreeBSD administration
• Expert-level C and C++ programming, including systems programming, memory management and debugging
• Expert knowledge of Apache HTTP Server: architecture, MPMs, modules and performance tuning
• Hands-on experience with ModSecurity and the OWASP CRS: rule writing, tuning and log analysis
• Solid understanding of TCP/IP, HTTP/HTTPS, TLS/PKI and common web attack vectors (OWASP Top 10)

Benefits

• Monthly Vouchers.
• Work in an international, dynamic, and fun environment at a growing company.
• Opportunity to work with a highly talented and experienced team on state-of-the-art projects.
• Access to resources for professional and personal development.