Infrastructure & Network Administrator

Cornspring; Greater London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A technology firm in Greater London is seeking a Network Administrator to manage and secure their Microsoft-based infrastructure. The ideal candidate will have 5–10 years of experience in network and system administration, with strong expertise in Microsoft Azure, Active Directory, and Microsoft 365. Responsibilities include ensuring reliable network operations and providing technical support for connectivity issues. This role offers competitive compensation, a hybrid working model, and the opportunity to work with cutting-edge technologies.

Benefits

Competitive compensation

Performance-based bonus

Hybrid working model

Challenging projects

Qualifications

• 5–10 years of experience in network and system administration within a Microsoft environment.
• Strong background in Azure and Microsoft 365 administration.
• Experience managing hybrid or cloud infrastructures.

Responsibilities

• Administer internal networks, ensuring stable and secure operations.
• Manage Microsoft Azure resources including networking and security.
• Provide technical support for network and connectivity issues.

Skills

Azure networking

Active Directory

Problem-solving

DNS / DHCP

Tools

Microsoft 365

Intune

Job description

You must have the right to work in the UK - no visa sponsorship can be provided.

Cornspring is redefining data solutions for Family Offices, Asset Owners, and UHNW clients. Our AI-powered platform integrates, validates, and secures private financial data, allowing intelligent insights via Gen-AI and LLM-based conversations.

Security, privacy, and reliability are at the heart of everything we do. As we scale our technology and infrastructure, we are seeking a diligent and experienced Network Administrator to manage, secure, and optimize our internal and cloud network environments.

This is a critical role supporting the stability and integrity of Cornspring’s Microsoft-based infrastructure, ensuring seamless, secure connectivity across systems, users, and cloud services.

Key responsibilities

Overview

• Responsible for the administration, maintenance, and performance of Cornspring’s internal networks, domain environment, and cloud-based services.
• Ensure the company’s network and system infrastructure operate reliably, efficiently, and securely.
• Collaborate with technology, security, and operations teams to support business continuity and employee productivity.

Network & Infrastructure Administration

• Manage and maintain Microsoft Azure resources including virtual networks, firewalls, VPNs, and hybrid connectivity.
• Administer and support NT domains, Active Directory, DNS, DHCP, and Group Policy Objects (GPOs).
• Oversee network hardware and connectivity for offices and remote workers, ensuring consistent performance and availability.
• Monitor network activity, bandwidth, and performance using established tools and best practices.
• Manage user provisioning, authentication, and access across systems.

Microsoft 365 & Endpoint Management

• Administer Microsoft 365 services including Exchange Online, Teams, SharePoint, and Intune.
• Manage device enrolment, configuration, and compliance through Intune and Azure AD.
• Ensure reliable and secure email, collaboration, and file-sharing capabilities for all users.
• Support user onboarding / offboarding processes and maintain accurate access records.

Security & Maintenance

• Apply security updates, software patches, and configuration changes in line with our security policies.
• Support endpoint protection and device compliance under the company’s security policies.
• Conduct regular network and system health checks, backups, and disaster recovery tests.
• Collaborate with the Head of Information Security on implementing zero-trust and identity management principles where relevant.

Support & Operations

• Provide 2nd and 3rd level technical support for network, server, and connectivity issues.
• Document network configurations, standard operating procedures, and troubleshooting guidelines.
• Work closely with vendors and service providers to ensure uptime and efficient issue resolution.

Requirements

Experience

• 5–10 years of experience in network and system administration, in a Microsoft-centric environment.
• Strong background in Microsoft Azure , NT domains , Active Directory , and Microsoft 365 administration.
• Experience managing hybrid or cloud-based infrastructures with distributed teams.
• Familiarity with ITIL-based service management practices and monitoring tools.

Technical Skills

• Proficiency in Azure networking , Active Directory , Group Policy , DNS / DHCP .
• Experience managing Azure AD Connect , Conditional Access , Intune , and device compliance policies .
• Good understanding of network fundamentals (LAN / WAN, VPNs, VLANs, routing, switching).
• Awareness of common security best practices such as least privilege, MFA enforcement, and secure configuration.

Mindset & Attributes

• Methodical, detail-oriented, and proactive in problem-solving.
• Strong communication and documentation skills.
• Reliable and consistent in delivering operational excellence.
• Comfortable working in a fast-paced, high-accuracy environment where reliability and confidentiality are essential.

Benefits

• Competitive compensation and performance-based bonus.
• Hybrid working : we work from a beautiful office in Bank 3 days a week.
• Being part of a revolutionary movement in Family Office technology.
• Working with cutting-edge AI and data technologies.
• Challenging projects that make a real impact to our sector.