Senior Site Reliability Engineer

About OffSec
Founded in 2006 by the creators of Kali Linux, OffSec (formerly known as Offensive Security) is the leading provider of continuous professional and workforce development, training, and education for cybersecurity practitioners. OffSec's distinct pedagogy and practical, hands-on learning help organizations fill the infosec talent gap by training their teams on today's most critical skills.

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With team members in over 40 countries, we believe in inspiring people of all backgrounds and communities. The OffSec team is composed of diverse, internationally published authors, conference speakers, and seasoned information technology professionals from both the private sector and governments worldwide.

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About The Job
OffSec is seeking an experienced Senior SRE to join our team and lead the design and implementation of complex, scalable lab environments that power our industry-leading cybersecurity training and certification programs. This senior-level position will work closely with Security Researchers and Platform Architects to architect sophisticated labs and vulnerable machine environments across hybrid cloud and on-premises infrastructure, enabling hands-on learning experiences for cybersecurity professionals worldwide.

The ideal candidate will bring deep expertise in OpenStack and modern SRE practices, with proven experience in large-scale infrastructure migrations and cost optimization. You'll design resilient, scalable, and secure infrastructure that deploys lab environments supporting thousands of concurrent users while maintaining the realistic attack scenarios our students depend on.

Duties And Responsibilities
Infrastructure Architecture & Migration Leadership

• Design and architect complex global data centers for labs supporting vulnerable machines and realistic attack scenarios using OpenStack
• Develop scalable infrastructure solutions across hybrid cloud and on-premises environments
• Design secure hosting networks and network topologies that can be used to support realistic offensive cyber activities.
• Establish infrastructure standards, patterns, and best practices for lab environment deployment
• Create architectural solutions that reduce infrastructure costs while improving capabilities and performance

Lab Environment Specialization

• Implement network isolation for thousands of concurrent user lab instances
• Optimize lab deployment speed and resource utilization for peak performance
• Create infrastructure supporting the deployment of concurrent vulnerable machine instances at scale
• Design workspace-based deployment models enabling team collaboration and private lab sessions

Strategic Technical Leadership & Collaboration

• Partner closely with Lead Platform and Content Engineers to proactively identify and solve infrastructure requirements
• Provide strategic technical guidance and mentorship to development and operations teams
• Lead architectural reviews and challenge requirements to propose optimal technical solutions
• Drive adoption of infrastructure-as-code and automated deployment practices
• Identify process improvements and optimization opportunities before being asked

Engineering & Automation

• Develop infrastructure automation using known Infrastructure as Code frameworks
• Create self-service capabilities for Content Engineers to deploy and manage lab resources efficiently
• Implement comprehensive monitoring, logging, and observability solutions for lab environments
• Establish disaster recovery and business continuity procedures with minimal downtime requirements
• Automate repetitive tasks to help reduce Toil
• Optimize application and infrastructure performance though automation and tuning
• Writes runbooks to automate repetitive tasks using Ansible and Terraform
• Serves as a knowledge resource for the rest of the team on Ansible and Terraform
• Evaluates new and emerging products, technologies and make recommendations concerning the introduction of new technologies
• Conducts ongoing research into relevant technology stacks and architectural patterns, assessing their potential impact and value for internal use
• Assists in monitoring performance to address errors and address bottlenecks
• Respond to and resolve infrastructure incidents and outages
• Participate in on-call rotations to ensure service reliability

Network Architecture & Security

• Design complex network architectures including VPNs, VLANs, and software-defined networking
• Implement network segmentation and security controls appropriate for vulnerable lab environments
• Configure and manage load balancers, firewalls, and network security appliances
• Design network monitoring and traffic analysis capabilities
• Ensure proper isolation between student lab environments while maintaining performance

Qualifications
Technical Expertise

• OpenStack: Production experience with OpenStack deployment, management, and optimization
• Cloud Platforms: 5+ years hands-on experience with AWS, Azure, and Google Cloud Platform
• Virtualization: Expert-level knowledge of OpenStack
• Networking: Deep understanding of TCP/IP, routing protocols, VPNs, firewalls, and network security
• Infrastructure as Code: Proficiency with any framework like Terraform, CloudFormation, ARM templates, and configuration management tools
• Containerization: Experience with Docker, Kubernetes or other container orchestration
• Operating Systems: Advanced knowledge of Linux and Windows Server

Professional Experience

• 4+ years of experience in SRE, Site Reliability Engineering, or Infrastructure Architecture roles
• 2+ years in a senior or lead technical role with architectural responsibilities
• Proven track record of designing and implementing large-scale, distributed systems
• Demonstrated experience with infrastructure cost optimization and migration projects
• Experience with high-availability and disaster recovery implementations
• Background in cybersecurity, penetration testing, or vulnerability research environments (preferred but not a requirement)

Strategic & Analytical Skills

• Proactive problem-solving with ability to understand broader context and implications
• Experience identifying and proposing solutions before being asked
• Ability to challenge requirements and suggest alternative approaches
• Track record of improving processes and identifying optimization opportunities
• Experience making architectural decisions with incomplete information

Performance Expectations

• Ability to work independently with minimal supervision while maintaining high quality standards
• Track record of successful large-scale infrastructure projects delivered on time
• Experience mentoring team members and driving technical standards adoption

Leadership & Communication

• Strong project management and technical leadership skills
• Excellent communication abilities with both technical and non-technical stakeholders
• Experience mentoring junior engineers and driving technical standards
• Ability to translate business requirements into cost-effective technical solutions

Preferred Qualifications

• Experience supporting systems through a SDLC - Dev, Staging Prod workflows
• Experience with cybersecurity tools and vulnerable application deployment
• Experience with monitoring tools like Prometheus, Grafana, ELK stack
• Familiarity with Offensive Security's training platforms and methodologies
• Open source contributions or technical writing experience

Working conditions
This role is a full-time position. Work hours for this position are flexible and will be performed from a home office.

Direct reports
This position has no direct reports.

OffSec provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.