Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure.

Why we need this role

This role is critical to protecting both internal telecom infrastructure and customer-facing security services. It ensures the secure deployment and management of technologies across backbone, edge, and cloud environments, while supporting the delivery and integration of managed security solutions for customers. The role plays a key part in incident response, vulnerability management, and maintaining robust security standards. By collaborating across engineering, operations, and product teams, it helps embed security into every layer of the network and service lifecycle, ensuring resilience, compliance, and customer trust.                                    

What you will do

Security Product Engineering (Customer-Facing Focus)

Support deployment and integration of customer security products such as managed firewalls, SD-WAN, SASE platforms, and DDoS mitigation solutions. Perform configuration, troubleshooting, and tuning of security services in customer environments. Assist in onboarding, proof-of-concept testing, and support transitions to operations for customer security services. Work with solution architects to operationalize and maintain secure design patterns and templates.

 

Infrastructure Security (Internal Focus)

Deploy and manage security technologies across the telecom backbone, edge, and data centre infrastructure (e.g., firewalls, IDS/IPS, SIEM, PAM, NAC). Collaborate with network and systems teams to secure IP/MPLS transport, SDN platforms, automation tools, and cloud workloads. Monitor and analyse security events and alerts, responding to incidents and escalating as appropriate. Assist with vulnerability assessments, patch management validation, and configuration hardening. Document and maintain infrastructure security standards, configurations, and runbooks.    

 

Support & Collaboration

Participate in security incident response, root cause analysis, and remediation efforts. Provide input on threat modelling, security testing, and design reviews for internal and external services. Stay current on security threats, tooling, and telecom-relevant vulnerabilities. Collaborate cross-functionally with engineering, operations, product, and customer support teams. What we're looking for

Must haves

3–7 years of experience in security engineering and/or network engineering Solid understanding of TCP/IP, routing, firewalls, VPN, and network segmentation principles. Hands-on experience with security tools such as firewalls (Fortinet, Palo Alto, etc.), SIEM/SOAR, IDS/IPS, EDR, or vulnerability scanners. Familiarity with Linux, scripting (Python, Bash), and infrastructure-as-code concepts. Knowledge of secure configuration standards (e.g., CIS benchmarks) and common protocols (e.g., BGP, DNS, SNMP).
    

Might haves

Experience supporting or delivering telecom or ISP infrastructure. Exposure to customer-facing security services or managed security environments. Familiarity with regulatory and industry standards (e.g., NIST, ISO 27001, UK TSA). Certifications such as Security+, GSEC, GCIA, or equivalent are a plus. Telecom or carrier experience strongly preferred     Skills Cyber Security ArchitectureIT Architecture MethodologiesCyber Security Tools/ProductsCyber Security PlanningSecurity ComplianceEducation A Masters of Bachelors degree such as Computer Science, Information Security or related fieldWhat we offer you:

Looking to make a mark?

At Colt, you’ll make a difference. Because around here, we empower people. We don’t tell you what to do.

Instead, we employ people we trust, who come together across the globe to create intelligent solutions.

Our global teams are full of ambitious, driven people, all working together towards one shared purpose: to put the power of the digital universe in the hands of our customers wherever, whenever and however they want.

We give our people the opportunity to inspire and lead teams, and work on projects that connect people, cities, businesses, and ideas. We want you to help us change the world, for the better.

 

 

Diversity and inclusion

Inclusion and valuing diversity of thought and experience are at the heart of our culture here at Colt. From day one, you’ll be encouraged to be yourself because we believe that’s what helps our people to thrive. We welcome people with diverse backgrounds and experiences, regardless of their gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth.

 

Most recently we have:

Signed the UN Women Empowerment Principles which guide our Gender Action Plan Trained 60 (and growing) Colties to be Mental Health First Aiders Please speak with a member of our recruitment team if you require adjustments to our recruitment process to support you. For more information about our Inclusion and Diversity agenda, visit our DEI pages.

 

 

Benefits

Our benefits support you through all parts of life, for both physical and mental health.

Flexible working hours and the option to work from home. Extensive induction program with experienced mentors and buddies. Opportunities for further development and educational opportunities. Global Family Leave Policy. Employee Assistance Program. Internal inclusion & diversity employee networks.

 

 

A global network

When you join Colt you become part of our global network. We are proud of our colleagues and the stories and experience they bring – take a look at ‘Our People’ site including our Empowered Women in Tech.