Job Title: Network Security Engineer - Nessus Experience Location: Manchester - 3 days per week onsite Salary/Rate: Up to £640 per day inside IR35 Start Date: 19/02/2026 Job Type: Contract until July Nessus Engineer responsible for maintaining the tool and the remediation of vulnerabilities across the bank. Job Description: We are looking for an individual who will join the security team of a major nationwide organization, who understands Tenable and its various components. While having experience with implementing the Tenable solution key, this job also requires full-time hands-on administration of the Tenable system as well as managing the vulnerability management aspect of the tool. Primary Responsibilities: Installing and Configuring Nessus, Nessus Manager, Nessus Agents, Log Correlation Engine, Nessus Network Monitor, and Security Center on both Linux/Unix and Windows based environments Responsible for installing and configuring Nessus Agents Secure Tenable server an Enable SSL Integrating Tenable products with LDAP, Active Directory, and CyberArk. Responsible for the creation of tenable Organizations, Repositories, and Scan Zones. Responsible for local and LDAP based user management. Responsible for configuring tenable plugins/feeds and adding audit files, licensing the product both online and offline. Responsible for adding scan policies, audit policies, and credentials to Security Center, and Nessus Manager. Responsible for configuring Nessus Manager scan pulls to Security Center Responsible for importing and adding dashboards Tenable-Nessus Security Analyst Responsible for defining scan policies and audit policies Responsible for adding scan credentials, scheduling scans, generating Scan Reports Responsible for the Analysis and validation of the scan result, monitoring, defining and configuring dashboards Technical Skills & Competencies: Strong experience in Vulnerability management domain and experience with working with web Proxy teams and working on vulnerability assessment operational issues Experience in the design and implementation of enterprise-wide security controls to secure systems, applications, network, or infrastructure services Hands-on experience with security tools and devices such as network firewalls, web proxy, intrusion prevention system, vulnerability scanner, and penetration testing tools. Demonstrated understanding of TCP/IP networking concepts and DNS. Knowledge of related Identity Management tools engineering experience, including installing, configuring and troubleshooting experience with one or more of these tools: CyberArk, Splunk, Tenable-Nessus Level of network engineering knowledge required, in order to onboard and remediate different networking devices Desirable: Previous experience in the financial sector. Working experience of security tool sets e.g Firewall Assurance, Cloud Access Security Broker (CASB), Cloud Security Posture Management (CSPM) Experience with ITIL processes Working knowledge of Service Now and/or Remedy Ticket Management Systems. Security Certification, MCSE, MCSA, CISSP, or better If you are interested in this opportunity, please apply now with your updated CV in Microsoft Word/PDF format. Disclaimer Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies. Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.