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.

This role is open in the US Why we need this role

This role is essential to strengthening both internal infrastructure security and customer-facing security services. It will lead the design and evolution of secure architecture across telecom networks, data centres, and cloud environments, embedding zero-trust principles and threat mitigation strategies. The position also drives the development of secure products for customers, such as managed firewalls and SD-WAN, while ensuring compliance with industry standards and mentoring junior talent. Acting as a senior authority, the role bridges technical leadership with strategic governance, helping shape enterprise-wide security standards and engaging directly with customers on secure solution design.

What you will do

Infrastructure Security (Internal Focus)

Design and evolve the security architecture for fixed-line telecom infrastructure including IP core networks, MPLS, SDN, optical transport, data centres, and cloud workloads. Provide guidance on zero-trust network design, micro-segmentation, DDoS mitigation, identity-based access, and threat detection. Conduct threat modelling and risk assessments across backbone and edge infrastructure, OSS/BSS systems, and service platforms. Partner with engineering and operations to embed security-by-design into network build-outs, technology refreshes, and automation initiatives.

 

Security Product Architecture (Customer-Facing Focus)

Lead architecture of customer-facing security services such as managed firewalls, SD-WAN, SASE, DDoS mitigation, endpoint protection, and threat intelligence. Work closely with product management to define secure architecture for new security products and evolve existing offerings. Evaluate and integrate third-party platforms into customer solutions, balancing security, performance, and operational scalability. Support solution design for enterprise customers, including large RFPs and bespoke secure connectivity projects.

 

Leadership & Governance

Act as a senior security architecture authority, helping to define enterprise security standards, patterns, and reference architectures. Contribute to compliance strategies aligned with industry regulations and security frameworks (e.g., UK TSA, NIST, ISO 27001, GDPR). Mentor and develop junior architects and engineers in the security organization. Engage directly with customers and partners as a senior technical leader on security strategy and solution design. What we're looking for

Must haves

10+ years of experience in cybersecurity, with 5+ years in security architecture roles. Deep understanding of fixed-line telecom infrastructure including IP/MPLS, optical transport, SDN/NFV, and data centre environments. Strong experience designing security controls for large-scale network and cloud systems. Familiarity with security frameworks such as NIST CSF, ISO 27001, MITRE ATT&CK, and relevant compliance regimes. Ability to clearly communicate technical concepts to business stakeholders and collaborate across functions. Telecom or carrier experience

Preferred

Experience developing or architecting managed security services or security platforms for enterprise customers. Security certifications such as CISSP, CCSP, SABSA, TOGAF, or equivalent. Knowledge of tools and platforms in areas like DDoS defense, ZTNA, SIEM/SOAR, EDR, and identity federation. Skills IT Strategic PlanningCyber Security ArchitectureIT Architecture MethodologiesBuilding and Managing TeamsSupervisory LeadershipEducation 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.