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Senior System Administrator

Sydney, New South Wales Job ID SAS20222104-81129
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L3Harris is dedicated to recruiting and developing diverse, high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris Technologies is an agile global aerospace and defense technology innovator, delivering end-to-end solutions that meet customers’ mission-critical needs. The company provides advanced defense and commercial technologies across space, air, land, sea and cyber domains. L3Harris has approximately $18 billion in annual revenue and 47,000 employees, with customers in more than 100 countries.


Job Title: Sr Spec, Sys Administration

Job Location: Australia-Canberra

Job Code: SAS2022104-81129

About us

Trenchant is an elite global team of engineers and security researchers charged with building world-class computer security products.

Trenchant’s expertise is the by-product of the L3Harris acquisition of two highly-regarded information security businesses – Azimuth Security and Linchpin Labs. United under Trenchant, we are a key component of L3Harris’ Intelligence and Cyber International Division.

We are a trusted, discrete partner furnishing security products, consultancy, training and integration services to allied security, defence, and law enforcement agencies.

Job Description

Working at Trenchant means working alongside the best security researchers and product engineers from across the security research and intelligence communities. You will be engaged on the most challenging problems in the toughest environments and delivering solutions supporting the cutting edge of cyber security research.

We require team members with an eye for security, to serve as key contributors on the AU operations team. The candidate must possess first-class IT and InfoSec security skills and be capable of shifting into a senior role within the team.


  • Serve as a key element of the Global Operations team, fusing priorities from research, engineering, operations and leadership to modernize network infrastructure and realize efficiencies across the business unit.
  • Manage business unit LANs, WANs, and wireless equipment, upgrading and tuning servers, routers, firewalls, load balancers, switches, and cloud infrastructure as needed.
  • Coordinate and execute rollout of new communications services, products, and software development infrastructure
  • Deploy, configure and manage existing, and new containerized applications.
  • Triage and diagnose network performance issues, ensuring stable infrastructure for security engineering and research teams.
  • Serve as a point of escalation for incident management and resolution.
  • Analyze network deployments, identify vulnerabilities, craft plans to improve security and orchestrate necessary interventions.
  • Participate in non-invasive red-team activities on Internet-connected and overlay networks, preparing and thoughtfully communicating results to research, engineering and business unit leadership.
  • Provide infosec consultation and emergency response services to a global team of 140 security engineers and researchers.

Skills and Experience

  • Bachelor's Degree and 4+ years relevant experience, or equivalent
  • Verifiable network or system administrator operations experience
  • Strong analytical and problem-solving skills
  • Ability to manage multiple competing priorities
  • Excellent written and verbal communications skills
  • Self-motivated, detail-oriented and highly organized
  • Current or prior AUS Government security clearance desirable

Preferred Additional Skills:

  • Broad experiencing administering and securing modern server, desktop and mobile operating systems
  • Experience securing networks and associated devices (firewalls, IDS/IPS, IPSec, VPNs)
  • Experience deploying and managing infrastructure including virtualization technology
  • Experience configuring, hardening and operating Linux and Window servers
  • Working knowledge of Juniper JunOS and Cisco IOS
  • Knowledge of public-key infrastructure
  • Experience with scripting languages such as Python, Bash, etc.
  • Experience aggregating and analysing activity logs
  • Intuitive understanding of micro services paradigm and hands-on experience with container deployment and orchestration technologies
  • Previous experience supporting software development teams and an understanding of the basic software development lifecycle would be an advantage. Languages/Frameworks

Security Requirements

Candidates will only be considered for a position at L3Harris Technologies if they are eligible to hold a security clearance. Candidates must be an Australian citizen and have a checkable background of at least 10 years to meet these requirements. A current NV2 security clearance is highly desirable.


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