Security Operations Analyst

We are looking for a high-calibre Security Operations Analyst to help lead and mature Security Operations s is a key role in our first line of defence and is suited to someone who can combine excellent investigation skills with strong operational judgement, stakeholder management, and a passion for improving detection and response capability.

This roleis responsible for helping ensure Nucleusidentifies, analyses, and responds to security threats across our technology estates. As a Security Operations Analyst, you will support the monitoring of the security resilience of our technology estate byoperatingthe processes that enable us to detect and respond to potentially disruptive events.

You will help manage our queues and dashboards; work with teams across Nucleus to collaborate on response actions; andidentifyopportunities for continuous improvement.

The Information Security team aims to make sure that Nucleus is a trusted partner to the firms and people we work with. Being able todemonstratethat our systems are secure, by effectively managing our security controls, is a corecomponentof building that trust. This role is critical to delivering that outcome as part of our first line of defence.

You will work with SMEs across Nucleus, and within the team you will help ensure that the Information Security Analysis team have appropriate evidence to demonstrate that our risks are effectively managed and provide input to the Application Security team that facilitates an effective change programme.

• Subject Matter Expert for security monitoring, making sure we have capabilities that enable appropriate detective controls and response processes, to mitigate Nucleus’ security risks.
• Threat hunting to ensure that emerging or unforeseen threats are identified and managed.
• Ensuring data and audit trails are maintained to support effective reporting.
• Able to effectively engage with stakeholders across the business.
• Ensure appropriate management of security incidents by creating clarity in complex and developing circumstances and making rapid decisions. Providing input to the company-wide Incident, Crisis, and Operational Resilience plans.
• Support Audit and Due Diligence activities to help evidence Nucleus’s capabilities.
• Manage security queues and dashboards, setting high standards for triage quality, documentation, and follow-through.
• Maintain high-quality investigation records, evidence, and audit trails suitable for regulated environments and audit scrutiny.
• Drive post-incident reviews / lessons learned, ensuring improvement actions are owned, tracked, and completed.
• Own investigations and incident actions through to closure, including follow-ups and verification that outcomes are complete and effective.
• Provide regular incident updates using agreed cadence and formats, including concise written updates, timelines, and stakeholder-ready summaries.
• Create clear written updates and presentations for the wider security team and stakeholders (e.g., incident summaries, monthly reporting, trends, improvement proposals).
• Deliver continuous improvement by identifying, prioritising, delivering, and tracking improvements to detection, response, and operational processes.
• Build, maintain, and regularly review security playbooks/runbooks, ensuring they remain current, technically accurate, and aligned with how teams across Nucleus operate.
• Mentor and support less experienced analysts, sharing knowledge, coaching investigation quality, and helping raise operational consistency across the team.
• Take responsibility in everything you do to deliver good outcomes for our customers.
• Be able to take part in an on-call rota / Out-Of-Hours if this was to be implemented.

Your friends might describe you as “the safe pair of hands.” You pay attention to the details, identifying where things can go wrong, before they go wrong. Being hands on and collaborating to put solutions in place to catch them before it can happen.

You are naturally inquisitive — you ask “why?” or “what does good look like?” and you do not stop at the first obvious answer. You enjoy being a problem solver, building a clear picture from…