Senior Security Specialist - Network Security

Malleum is at the forefront of next-generation cyber defense, partnering with marquee clients across government, defense, financial services, and critical infrastructure. We're experiencing exceptional growth as demand accelerates for trusted advisors capable of delivering at the intersection of national security, allied intelligence cooperation, and enterprise resilience. Our consultants embed directly with clients to design, secure, and operate the networks and systems behind cutting-edge defensive technologies and programs with national and allied security impact.
If you take pride in being the trusted technical hands clients rely on to keep mission-critical environments running and to help them recover when things go wrong, Malleum is where your craft meets purpose. We're seeking a client-facing Network & Security Consultant to deliver hands-on design, administration, hardening, and operational support across client network and security infrastructure, and to play a critical supporting role in active incident response (IR) engagements. In this role you'll work remotely and at times on-site, within client environments including sovereign, regulated, and cleared settings providing the technical expertise, composure, and professionalism that define the Malleum delivery experience.
This is a hands-on consulting role for a senior-level practitioner who blends deep technical skill with strong client presence, and who can step up when crises demand long, focused hours alongside our IR team. Administer, monitor, and maintain client network infrastructure including routers, switches, firewalls, VPNs, and wireless systems
Operate and tune client security tooling such as EDR/XDR, SIEM, email security, vulnerability scanners, and identity platforms (Entra ID, Okta)
Design, deploy, and operate Zero Trust Network Access (ZTNA) solutions, including Cloudflare edge, access, and tunnel services, to enable secure remote access, identity-aware policies, and modern perimeter strategies
Support Microsoft 365, Azure, AWS, and hybrid environments within each client's security baseline and compliance posture
Lead patch management, vulnerability remediation, and configuration management across client servers, endpoints, and network devices
Work odd hours, evenings, weekends, and extended shifts during active IR engagements, including rapid mobilization with little notice when clients are under attack
Produce high-quality client deliverables: network diagrams, configuration documentation, runbooks, SOPs, IR action logs, and status reports
Serve as a trusted technical point of contact, communicating clearly with client stakeholders ranging from end users to executive leadership during both steady-state and crisis operations
Contribute to scoping, estimation, and continuous improvement of Malleum's managed, project-based, and IR service offerings
Participate in an on-call rotation supporting critical client infrastructure and security events
Deep, hands-on, multi-vendor network and firewall experience - routing, switching, segmentation, and firewall policy you can design, deploy, troubleshoot, and demonstrate in a technical interview (Fortinet, Palo Alto, and/or Cisco). Demonstrated success working directly with clients - clear communication, professionalism, and stakeholder management, including explaining technical risk and decisions to non-technical leadership
Significant progressive experience blending network and cybersecurity responsibilities, ideally in a consulting, MSP, MSSP, or IR setting
Solid understanding of Zero Trust Network Access (ZTNA) fundamentals: identity-centric access, least privilege, micro-segmentation, device posture, and continuous verification
Hands-on experience with wireless controllers and NAC solutions
Willingness and availability to work odd hours, weekends, and extended shifts when supporting active IR matters
Working knowledge of Windows Server, Active Directory, Group Policy, and Microsoft 365 / Azure administration
Familiarity with Linux administration and scripting (PowerShell, Bash, or Python) for automation and rapid response
Microsoft Sentinel, Defender, CrowdStrike, Splunk), including rapid deployment in IR scenarios
Exposure to incident response frameworks such as NIST SP 800-61 and SANS PICERL is a strong asset
Solid grasp of cybersecurity fundamentals: identity, encryption, logging, hardening, and zero-trust principles
Certifications such as CompTIA Security+, Network+, CCNA, CCNP Security, NSE, PCNSA, MS-102, AZ-104, or equivalent strongly preferred; CISSP Associate, SSCP, GCIH, or GCFA an asset
Eligibility for Government of Canada security clearance (Secret or higher); Bilingualism (English/French) considered a strong asset
Work shoulder-to-shoulder with marquee clients on programs and incidents with genuine national and allied security impact
Join a rapidly scaling firm with a flat, high-trust culture and direct access to senior IR and technical leaders
Exposure to a wide variety of advanced security tooling, sectors, and cleared environments
Competitive compensation, on-call and IR premiums, performance incentives, and comprehensive benefits
Continuous learning budget, certification sponsorship, and clear paths into senior engineering, IR, architecture, or security specializations

We welcome applications from all qualified candidates and are committed to building a team that reflects the communities and missions we serve.
We are committed to providing accommodations for individuals with disabilities throughout the recruitment process. Please let us know if you require accommodation at any stage.