Colt Technology Services Group Ltd.
Job ID: 36123 Job location: London, GB IT Manager, enterprise infrastructure services & cloud Why we need this role The Manager IT Infrastructure (M365, Azure, GCP, Windows & VDI) is responsible for the end-to-end delivery, operation, and performance of critical enterprise platforms, including Microsoft 365, Azure, GCP, Windows Server, VDI, and Citrix services. The role leads a team of approximately 15 engineers, ensuring the secure, stable, and efficient operation of business-critical services, while delivering roadmap initiatives, platform improvements, and automation outcomes aligned to architecture and strategy. Working closely with Architecture, Security, Development, and wider Operations teams, the role ensures solutions are delivered, integrated, and operated at scale, with a strong focus on service reliability, security, cost efficiency, and user experience. The role embeds operational excellence, resilience, automation, and governance, driving standardisation and continuous improvement across cloud, workplace, and identity platforms. Through strong leadership and execution, it reduces risk, complexity, and operational overhead, while improving service performance, stability, and cost control. What you will do Microsoft 365 Platforms: Ownership of collaboration and productivity services (Teams, Exchange, SharePoint, OneDrive, Intune), including service performance, governance, security, lifecycle, and user experience. Azure & GCP Cloud: Operational management of cloud platforms including landing zones, subscriptions/projects, connectivity, platform services, and governance controls. Windows & End User Platforms: Management of Windows Server and end-user compute platforms, including build, patching, configuration, and lifecycle. VDI & Citrix: Delivery and operation of virtual desktop environments, ensuring performance, availability, and user experience. Identity & Access: Operational ownership of Active Directory and Entra ID, including authentication, Conditional Access, privileged access, and directory services. Cloud Security & Compliance: Enforcement of secure configurations, monitoring, logging, and policy controls across all platforms. Standardisation, Automation & Tooling: Leads delivery of standardisation, automation, tooling, and operational consistency across cloud and workplace platforms. Key Accountabilities Service Delivery, Engineering & Operations Lead the build, delivery, and operation of critical infrastructure services across M365, cloud, Windows, and VDI. Ensure platforms meet availability, performance, and service level expectations. Act as senior escalation point for major incidents and service issues. Security, Resilience & Service Stability Ensure secure-by-design and operational security controls are implemented and maintained. Own resilience, recoverability, monitoring, and service continuity across platforms. Roadmap Delivery & Continuous Improvement Deliver platform roadmaps and improvement initiatives in line with architectural direction. Drive continuous improvement in automation, efficiency, and service quality. Team Leadership & Capability Development Lead and develop a high-performing engineering team (FTE & contingent). Build capability across cloud, workplace, and identity domains. Ensure effective workload management, prioritisation, and delivery. Cross-Domain Collaboration & Integration Work with Architecture, Security, Development, and Operations teams to deliver integrated services. Ensure solutions are fully transitioned, supported, and operationally sustainable. Vendor & Service Management Ensure service performance, delivery quality, and issue resolution. Operational Governance, Cost & Optimisation Ensure services are aligned to standards and governed through full lifecycle. Manage operational cost, capacity, and efficiency. Drive automation, standardisation, and reduction of technical debt and complexity. Additional Focus Areas Ownership & Accountability: Owns service outcomes across availability, security, and cost. Leadership & Team Development: Builds, leads, and develops high-performing teams. Execution & Delivery: Drives consistent, high-quality service and platform delivery. Collaboration & Influence: Works effectively across domains and stakeholders. Adaptability & Improvement: Responds to operational challenges while driving automation and optimisation. What we're looking for Extensive experience leading infrastructure engineering and operations teams in enterprise environments. Strong expertise across Microsoft 365 and workplace services, Azure and GCP cloud operations, Windows Server, VDI/Citrix, and identity (Active Directory, Entra), with robust knowledge of security, resilience, operational controls, and automation tooling. Proven ability to manage business-critical services at scale. Strong stakeholder, vendor, and team leadership capability. Excellent operational, analytical, and decision-making skills. Ownership & Accountability: Takes responsibility for delivering outcomes and driving technical excellence. Leadership & Influence: Ability to inspire, motivate, and guide team members toward achieving goals. Communication: Clear and concise verbal and written communication skills for technical and non-technical audiences. Problem Solving: Strong analytical skills to troubleshoot complex issues and implement effective solutions. Collaboration: Skilled at building relationships and working effectively across teams and stakeholders. Adaptability: Comfortable managing priorities in a fast-paced, evolving environment. Continuous Improvement Mindset: Proactive in identifying opportunities for process and technology enhancements. Qualifications Bachelor's degree in Computer Science, Information Technology, or equivalent experience. Relevant certifications (e.g., Microsoft Certified: Azure Solutions Architect, Citrix Certified Expert, VMware VCP, Google Cloud Professional Architect) preferred. Diversity and Inclusion Inclusion and valuing diversity of thought and experience are at the heart of our culture. We welcome people with diverse backgrounds and experiences, regardless of gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth. Recent Initiatives Signed the UN Women Empowerment Principles which guide our Gender Action Plan. Trained 60+ employees to be Mental Health First Aiders. Provide adjustments to our recruitment process to support candidates as required. Benefits Flexible working hours and the option to work from home. Extensive induction programme with experienced mentors and buddies. Opportunities for further development and educational opportunities. Global Family Leave Policy. Employee Assistance Programme. Internal inclusion & diversity employee networks.
Job ID: 36123 Job location: London, GB IT Manager, enterprise infrastructure services & cloud Why we need this role The Manager IT Infrastructure (M365, Azure, GCP, Windows & VDI) is responsible for the end-to-end delivery, operation, and performance of critical enterprise platforms, including Microsoft 365, Azure, GCP, Windows Server, VDI, and Citrix services. The role leads a team of approximately 15 engineers, ensuring the secure, stable, and efficient operation of business-critical services, while delivering roadmap initiatives, platform improvements, and automation outcomes aligned to architecture and strategy. Working closely with Architecture, Security, Development, and wider Operations teams, the role ensures solutions are delivered, integrated, and operated at scale, with a strong focus on service reliability, security, cost efficiency, and user experience. The role embeds operational excellence, resilience, automation, and governance, driving standardisation and continuous improvement across cloud, workplace, and identity platforms. Through strong leadership and execution, it reduces risk, complexity, and operational overhead, while improving service performance, stability, and cost control. What you will do Microsoft 365 Platforms: Ownership of collaboration and productivity services (Teams, Exchange, SharePoint, OneDrive, Intune), including service performance, governance, security, lifecycle, and user experience. Azure & GCP Cloud: Operational management of cloud platforms including landing zones, subscriptions/projects, connectivity, platform services, and governance controls. Windows & End User Platforms: Management of Windows Server and end-user compute platforms, including build, patching, configuration, and lifecycle. VDI & Citrix: Delivery and operation of virtual desktop environments, ensuring performance, availability, and user experience. Identity & Access: Operational ownership of Active Directory and Entra ID, including authentication, Conditional Access, privileged access, and directory services. Cloud Security & Compliance: Enforcement of secure configurations, monitoring, logging, and policy controls across all platforms. Standardisation, Automation & Tooling: Leads delivery of standardisation, automation, tooling, and operational consistency across cloud and workplace platforms. Key Accountabilities Service Delivery, Engineering & Operations Lead the build, delivery, and operation of critical infrastructure services across M365, cloud, Windows, and VDI. Ensure platforms meet availability, performance, and service level expectations. Act as senior escalation point for major incidents and service issues. Security, Resilience & Service Stability Ensure secure-by-design and operational security controls are implemented and maintained. Own resilience, recoverability, monitoring, and service continuity across platforms. Roadmap Delivery & Continuous Improvement Deliver platform roadmaps and improvement initiatives in line with architectural direction. Drive continuous improvement in automation, efficiency, and service quality. Team Leadership & Capability Development Lead and develop a high-performing engineering team (FTE & contingent). Build capability across cloud, workplace, and identity domains. Ensure effective workload management, prioritisation, and delivery. Cross-Domain Collaboration & Integration Work with Architecture, Security, Development, and Operations teams to deliver integrated services. Ensure solutions are fully transitioned, supported, and operationally sustainable. Vendor & Service Management Ensure service performance, delivery quality, and issue resolution. Operational Governance, Cost & Optimisation Ensure services are aligned to standards and governed through full lifecycle. Manage operational cost, capacity, and efficiency. Drive automation, standardisation, and reduction of technical debt and complexity. Additional Focus Areas Ownership & Accountability: Owns service outcomes across availability, security, and cost. Leadership & Team Development: Builds, leads, and develops high-performing teams. Execution & Delivery: Drives consistent, high-quality service and platform delivery. Collaboration & Influence: Works effectively across domains and stakeholders. Adaptability & Improvement: Responds to operational challenges while driving automation and optimisation. What we're looking for Extensive experience leading infrastructure engineering and operations teams in enterprise environments. Strong expertise across Microsoft 365 and workplace services, Azure and GCP cloud operations, Windows Server, VDI/Citrix, and identity (Active Directory, Entra), with robust knowledge of security, resilience, operational controls, and automation tooling. Proven ability to manage business-critical services at scale. Strong stakeholder, vendor, and team leadership capability. Excellent operational, analytical, and decision-making skills. Ownership & Accountability: Takes responsibility for delivering outcomes and driving technical excellence. Leadership & Influence: Ability to inspire, motivate, and guide team members toward achieving goals. Communication: Clear and concise verbal and written communication skills for technical and non-technical audiences. Problem Solving: Strong analytical skills to troubleshoot complex issues and implement effective solutions. Collaboration: Skilled at building relationships and working effectively across teams and stakeholders. Adaptability: Comfortable managing priorities in a fast-paced, evolving environment. Continuous Improvement Mindset: Proactive in identifying opportunities for process and technology enhancements. Qualifications Bachelor's degree in Computer Science, Information Technology, or equivalent experience. Relevant certifications (e.g., Microsoft Certified: Azure Solutions Architect, Citrix Certified Expert, VMware VCP, Google Cloud Professional Architect) preferred. Diversity and Inclusion Inclusion and valuing diversity of thought and experience are at the heart of our culture. We welcome people with diverse backgrounds and experiences, regardless of gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth. Recent Initiatives Signed the UN Women Empowerment Principles which guide our Gender Action Plan. Trained 60+ employees to be Mental Health First Aiders. Provide adjustments to our recruitment process to support candidates as required. Benefits Flexible working hours and the option to work from home. Extensive induction programme with experienced mentors and buddies. Opportunities for further development and educational opportunities. Global Family Leave Policy. Employee Assistance Programme. Internal inclusion & diversity employee networks.
RadNet, Inc.
Enterprise Architect -Virtualization Practice Area Enterprise Architecture -Virtualization & Private Cloud Reports To Manager, ES&A Location Remote / Client site as required Travel Up to 30%, dependent on engagement portfolio Role Summary World Wide Technology is looking for an Enterprise Architect who lives and breathes virtualization and private cloud platforms -someone equally fluent architecting a VMware vSphere/NSX estate and a Red Hat OpenShift or OpenStack platform, and who can lead clients through the platform decisions reshaping this space, including VMware-to-Kubernetes migration. This role owns technical delivery for virtualization and private cloud engagements end to end: architecture and low-level design, build oversight, migration execution, and operational handover. The candidate will be the final technical authority on virtualization platform decisions for their engagements, while mentoring the wider delivery team. Given how tightly virtualization now intersects with containers, storage, networking, and even AI infrastructure, strong adjacent technical breadth is a real advantage for this role, even though platform depth in VMware and Red Hat remains the core requirement. Key Responsibilities Own end-to-end technical delivery of virtualization and private cloud engagements: architecture definition, low-level design, build/migration oversight, and go-live validation. Host and chair Architecture Review Board (ARB) and Technical Design Authority (TDA) sessions for virtualization engagements, owning governance gates, decision records, and design sign-off. Architect and validate VMware environments: vSphere/ESXi cluster design, vCenter, vSAN, NSX-T/NSX-V network virtualization, and VMware Cloud Foundation (VCF) deployments. Architect Red Hat platforms: OpenShift Container Platform (OCP) design and installation (IPI/UPI), OpenShift Virtualization (KubeVirt) for VM-to-container consolidation, and Red Hat OpenStack Platform (RHOSP) design and deployment. Lead VMware-to-Kubernetes and VM-to-container migration strategy engagements, including workload assessment, sequencing, and risk mitigation -particularly relevant given ongoing VMware/Broadcom licensing changes driving client re-evaluation. Design software-defined storage and networking as applied to virtualization platforms: vSAN, Ceph/OpenShift Data Foundation (ODF), and NSX. Define disaster recovery and business continuity architectures for virtualized estates, including Site Recovery Manager and equivalent DR orchestration. Lead technical design workshops, present architecture options and trade-offs to infrastructure leadership, and own resulting low-level design documentation. Champion infrastructure-as-code and automation (Ansible, Terraform, GitOps/ArgoCD) to reduce manual platform operations. Mentor other virtualization and platform engineers, and contribute to WWT's private cloud reference architectures. Define migrations strategies Required Technical Skills & Experience Experience Baseline 8-10+ years in virtualization, private cloud, or infrastructure architecture roles. Demonstrated ownership of technical delivery for enterprise-scale virtualization or private cloud transformation programmes. Direct hands on experience with VMware-to-Kubernetes or VM-to-container migration engagements strongly preferred. VMware Platform (Expert Level) Core platform: vSphere/ESXi cluster design, vCenter architecture, resource pools, DRS/HA tuning. Storage: vSAN design and sizing, stretched clusters, storage policy based management. Networking: NSX T/NSX V network virtualization, micro segmentation, and distributed firewall design. Platform: VMware Cloud Foundation (VCF) deployment and lifecycle management. DR & VDI: Site Recovery Manager design; Horizon VDI architecture is a plus. OpenShift: OpenShift Container Platform (OCP) architecture and installation (IPI/UPI), cluster networking (SDN/OVN Kubernetes), and multi cluster design. OpenShift Virtualization: KubeVirt based VM to container consolidation strategy and implementation. OpenStack: Red Hat OpenStack Platform (RHOSP) architecture, deployment, and lifecycle operations. Automation: Red Hat Satellite and Ansible Automation Platform for lifecycle and configuration management. Containers & Cloud Native Fundamentals Kubernetes architecture fundamentals: control plane design, networking (CNI, Multus, SR IOV), and storage (CSI, ODF/Ceph). Operator framework familiarity and experience packaging or consuming Kubernetes operators. Software defined storage: Ceph/OpenShift Data Foundation design and sizing for both block and object workloads. Hands on experience with private/hybrid cloud design principles: capacity planning, workload placement, and migration methodology (P2V/V2V, VM to container). Disaster recovery and business continuity architecture for virtualized and containerized environments. Fluency in VMware/Broadcom and Red Hat subscription/licensing models sufficient to advise clients on cost and platform strategy. Automation & Delivery Infrastructure as code proficiency: Ansible and Terraform for platform provisioning. GitOps experience (ArgoCD or equivalent) for OpenShift/Kubernetes application and platform delivery. Strong client facing design and delivery leadership skills; ability to run technical workshops and own low level design documentation to a professional services standard. Architecture Governance & Design Authority Proven experience hosting and chairing formal Architecture Review Board (ARB) and Technical Design Authority (TDA) forums, including agenda ownership, decision logging, and stakeholder facilitation. Ability to define and operate governance gates across the engagement lifecycle: design authority sign off, change control, and exception/waiver management for virtualization and private cloud decisions. Experience producing and maintaining architecture decision records (ADRs), design standards, and reference architectures that are actively enforced through ARB/TDA governance. Comfortable presenting and defending architecture decisions to senior client governance bodies, including constructively challenging non compliant or high risk designs. Certifications VMware Certified Professional - Data Center Virtualization (VCP DCV) required; VMware Certified Advanced Professional (VCAP) strongly preferred. Red Hat Certified Specialist in OpenShift Administration required; Red Hat Certified Architect (RHCA) strongly preferred. Red Hat Certified Specialist in OpenStack Administration -required or clearly demonstrated equivalent experience. Adjacent Technical Skills (Beneficial, Not Required) Depth in the specialist area above is mandatory. Experience in the following adjacent domains is a strong plus and will be valued in candidate evaluation, since it enables broader solution ownership across engagements. Public cloud platforms (AWS, Azure, GCP), particularly hybrid and cloud adjacent private cloud designs. Networking (routing/switching, data center fabric) given the tight coupling with NSX/OVN Kubernetes design. Storage architecture beyond vSAN/Ceph, including traditional SAN/NAS platforms. Security architecture, particularly micro segmentation and platform hardening. AI infrastructure exposure, as GPU enabled virtualization and OpenShift AI are an increasing share of client demand. Backup and DR platforms (Veeam, Rubrik, or equivalent). Leadership & Delivery Expectations Leads technical delivery independently and acts as the final technical authority on virtualization platform decisions for an engagement. Mentors other engineers and architects across both VMware and Red Hat platform domains. Navigates vendor and licensing complexity confidently, translating commercial constraints into sound technical roadmaps for clients. Communicates platform trade offs clearly to both hands on engineering teams and infrastructure leadership. Comfortable owning migration cutover windows and the associated risk management. WWT is an Equal Opportunity Employer Employment decisions are made without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status or other characteristics protected by law. We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you have a disability and you believe you need a reasonable accommodation in order to search for a job opening or to submit an online application, please call 1- and ask for Human Resources. Applicants to and employees of most private employers, state and local governments, educational institutions, employment agencies and labor organizations are protected under Federal law from discrimination.
Enterprise Architect -Virtualization Practice Area Enterprise Architecture -Virtualization & Private Cloud Reports To Manager, ES&A Location Remote / Client site as required Travel Up to 30%, dependent on engagement portfolio Role Summary World Wide Technology is looking for an Enterprise Architect who lives and breathes virtualization and private cloud platforms -someone equally fluent architecting a VMware vSphere/NSX estate and a Red Hat OpenShift or OpenStack platform, and who can lead clients through the platform decisions reshaping this space, including VMware-to-Kubernetes migration. This role owns technical delivery for virtualization and private cloud engagements end to end: architecture and low-level design, build oversight, migration execution, and operational handover. The candidate will be the final technical authority on virtualization platform decisions for their engagements, while mentoring the wider delivery team. Given how tightly virtualization now intersects with containers, storage, networking, and even AI infrastructure, strong adjacent technical breadth is a real advantage for this role, even though platform depth in VMware and Red Hat remains the core requirement. Key Responsibilities Own end-to-end technical delivery of virtualization and private cloud engagements: architecture definition, low-level design, build/migration oversight, and go-live validation. Host and chair Architecture Review Board (ARB) and Technical Design Authority (TDA) sessions for virtualization engagements, owning governance gates, decision records, and design sign-off. Architect and validate VMware environments: vSphere/ESXi cluster design, vCenter, vSAN, NSX-T/NSX-V network virtualization, and VMware Cloud Foundation (VCF) deployments. Architect Red Hat platforms: OpenShift Container Platform (OCP) design and installation (IPI/UPI), OpenShift Virtualization (KubeVirt) for VM-to-container consolidation, and Red Hat OpenStack Platform (RHOSP) design and deployment. Lead VMware-to-Kubernetes and VM-to-container migration strategy engagements, including workload assessment, sequencing, and risk mitigation -particularly relevant given ongoing VMware/Broadcom licensing changes driving client re-evaluation. Design software-defined storage and networking as applied to virtualization platforms: vSAN, Ceph/OpenShift Data Foundation (ODF), and NSX. Define disaster recovery and business continuity architectures for virtualized estates, including Site Recovery Manager and equivalent DR orchestration. Lead technical design workshops, present architecture options and trade-offs to infrastructure leadership, and own resulting low-level design documentation. Champion infrastructure-as-code and automation (Ansible, Terraform, GitOps/ArgoCD) to reduce manual platform operations. Mentor other virtualization and platform engineers, and contribute to WWT's private cloud reference architectures. Define migrations strategies Required Technical Skills & Experience Experience Baseline 8-10+ years in virtualization, private cloud, or infrastructure architecture roles. Demonstrated ownership of technical delivery for enterprise-scale virtualization or private cloud transformation programmes. Direct hands on experience with VMware-to-Kubernetes or VM-to-container migration engagements strongly preferred. VMware Platform (Expert Level) Core platform: vSphere/ESXi cluster design, vCenter architecture, resource pools, DRS/HA tuning. Storage: vSAN design and sizing, stretched clusters, storage policy based management. Networking: NSX T/NSX V network virtualization, micro segmentation, and distributed firewall design. Platform: VMware Cloud Foundation (VCF) deployment and lifecycle management. DR & VDI: Site Recovery Manager design; Horizon VDI architecture is a plus. OpenShift: OpenShift Container Platform (OCP) architecture and installation (IPI/UPI), cluster networking (SDN/OVN Kubernetes), and multi cluster design. OpenShift Virtualization: KubeVirt based VM to container consolidation strategy and implementation. OpenStack: Red Hat OpenStack Platform (RHOSP) architecture, deployment, and lifecycle operations. Automation: Red Hat Satellite and Ansible Automation Platform for lifecycle and configuration management. Containers & Cloud Native Fundamentals Kubernetes architecture fundamentals: control plane design, networking (CNI, Multus, SR IOV), and storage (CSI, ODF/Ceph). Operator framework familiarity and experience packaging or consuming Kubernetes operators. Software defined storage: Ceph/OpenShift Data Foundation design and sizing for both block and object workloads. Hands on experience with private/hybrid cloud design principles: capacity planning, workload placement, and migration methodology (P2V/V2V, VM to container). Disaster recovery and business continuity architecture for virtualized and containerized environments. Fluency in VMware/Broadcom and Red Hat subscription/licensing models sufficient to advise clients on cost and platform strategy. Automation & Delivery Infrastructure as code proficiency: Ansible and Terraform for platform provisioning. GitOps experience (ArgoCD or equivalent) for OpenShift/Kubernetes application and platform delivery. Strong client facing design and delivery leadership skills; ability to run technical workshops and own low level design documentation to a professional services standard. Architecture Governance & Design Authority Proven experience hosting and chairing formal Architecture Review Board (ARB) and Technical Design Authority (TDA) forums, including agenda ownership, decision logging, and stakeholder facilitation. Ability to define and operate governance gates across the engagement lifecycle: design authority sign off, change control, and exception/waiver management for virtualization and private cloud decisions. Experience producing and maintaining architecture decision records (ADRs), design standards, and reference architectures that are actively enforced through ARB/TDA governance. Comfortable presenting and defending architecture decisions to senior client governance bodies, including constructively challenging non compliant or high risk designs. Certifications VMware Certified Professional - Data Center Virtualization (VCP DCV) required; VMware Certified Advanced Professional (VCAP) strongly preferred. Red Hat Certified Specialist in OpenShift Administration required; Red Hat Certified Architect (RHCA) strongly preferred. Red Hat Certified Specialist in OpenStack Administration -required or clearly demonstrated equivalent experience. Adjacent Technical Skills (Beneficial, Not Required) Depth in the specialist area above is mandatory. Experience in the following adjacent domains is a strong plus and will be valued in candidate evaluation, since it enables broader solution ownership across engagements. Public cloud platforms (AWS, Azure, GCP), particularly hybrid and cloud adjacent private cloud designs. Networking (routing/switching, data center fabric) given the tight coupling with NSX/OVN Kubernetes design. Storage architecture beyond vSAN/Ceph, including traditional SAN/NAS platforms. Security architecture, particularly micro segmentation and platform hardening. AI infrastructure exposure, as GPU enabled virtualization and OpenShift AI are an increasing share of client demand. Backup and DR platforms (Veeam, Rubrik, or equivalent). Leadership & Delivery Expectations Leads technical delivery independently and acts as the final technical authority on virtualization platform decisions for an engagement. Mentors other engineers and architects across both VMware and Red Hat platform domains. Navigates vendor and licensing complexity confidently, translating commercial constraints into sound technical roadmaps for clients. Communicates platform trade offs clearly to both hands on engineering teams and infrastructure leadership. Comfortable owning migration cutover windows and the associated risk management. WWT is an Equal Opportunity Employer Employment decisions are made without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status or other characteristics protected by law. We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you have a disability and you believe you need a reasonable accommodation in order to search for a job opening or to submit an online application, please call 1- and ask for Human Resources. Applicants to and employees of most private employers, state and local governments, educational institutions, employment agencies and labor organizations are protected under Federal law from discrimination.