IT Infrastructure and Security Engineer

Zentso builds and operates Cloud Toolz, a revenue-critical SaaS platform layered on top of iMIS RiSE association management software, serving clients across the UK, Europe, United States, and Asia Pacific. The platform encompasses workflow automation, form building, CRM, CMS, and payment processing capabilities delivered to organisations in multiple sectors.

We are seeking a motivated IT Infrastructure and Security Engineer to support the global infrastructure and security posture underpinning Cloud Toolz and Zentso's internal systems. This is a hands‑on, junior-to-mid-level role working closely with the IT Infrastructure and Security Lead and the CTO, assisting with day‑to‑day operations, security tasks, and the ongoing migration toward a containerised, Kubernetes‑based deployment model. The successful candidate will be comfortable working across a distributed, multi‑region environment, contributing directly to uptime, security, and compliance outcomes for a production platform.

A key part of this role is supporting Zentso's transition to Kubernetes and helping build out an observability practice around Grafana OSS, alongside contributing scripts and small applications that automate and support infrastructure operations.

• Help manage global infrastructure spanning Windows Server 2022, SQL Server, MongoDB, Redis, and Cloudflare across four regions, supporting the availability, performance, and scalability of the revenue-critical Cloud Toolz platform.
• Support deployments of new Cloud Toolz releases (ASP.NET Core, integrating with Dynamics, iMIS, Salesforce, and native CRM/CMS) and contribute to the Kubernetes migration, including cluster operations such as deployments, scaling, network policies, and RBAC.
• Help build and maintain a Grafana OSS observability stack — dashboards, alerting, and integration with metrics, logs, and traces. Assist with DNS, CDN, WAF, and DDoS protection via Cloudflare; monitor system performance and participate in incident response and recovery.
• Maintain documentation, runbooks, and disaster recovery procedures.
• Write shell scripts and small infrastructure‑related applications (automation tools, monitoring utilities, internal dashboards) in coordination with the Infrastructure Lead.

• Support identity and access management, endpoint protection, and vulnerability management.
• Help administer policies across Microsoft 365, Bitwarden, Bitdefender Gravity Zone, and Know Be
  4.
• Contribute to GDPR/ISO 27001‑aligned data protection policies, security awareness training, phishing simulations, and threat monitoring/response.

• Support Microsoft 365 administration (Exchange Online, SharePoint, Teams, Entra ) and Salesforce administration within scope.
• Share responsibility for endpoint security and password management configuration.

• Provide input on infrastructure scaling, architecture decisions, and the containerisation roadmap.
• Support infrastructure‑as‑code adoption and automate routine operations using Power Shell, shell scripting, and other languages.
• Contribute to sprint planning for environment‑level requirements and participate in on‑call rotation.

• 2+ years of experience in IT infrastructure, cloud operations, systems administration, or Dev Ops.
• Hands‑on experience with Windows Server 2022, SQL Server, MongoDB, and Redis in operational contexts. Practical Cloudflare experience (DNS, WAF, CDN, security features).
• Working proficiency in Microsoft 365 administration, including Entra , Exchange Online, and SharePoint.
• Hands‑on Kubernetes experience: workload deployment, basic cluster operations, networking (ingress, network policies), and RBAC.
• Solid…