Flagstone Group LTD - Senior Security Engineer
Requirements
• Hands-on SIEM experience, ideally Microsoft Sentinel; equivalent platforms (Splunk, Chronicle, QRadar) considered • Practical Azure security experience across Defender for Cloud, Entra ID, Azure networking, and cloud security posture management • Experience writing infrastructure-as-code using Terraform or Bicep in a security engineering context • Ability to contribute to threat modelling and communicate security risk clearly to engineering and product audiences • Experience supporting or coordinating penetration testing programmes, including managing remediation cycles • Familiarity with AI security considerations (securing AI workloads, data exposure risks) and/or using AI tooling to augment security engineering workflows • A growth mindset and genuine curiosity to keep learning • SC-200 (Microsoft Security Operations Analyst) certification • KQL proficiency for detection rule authoring and threat hunting • Experience working in a similar fintech/financial services environment • How we reward you: • How we reward you: • At Flagstone, the benefits extend beyond false gifts like “fruit and snacks”. Instead, we invest in your health, wealth, and professional development. Here’s a selection of our benefits: • Competitive bonus scheme - designed to reward and recognise high performance • Flexible benefits budget - a pot to fund meaningful benefits for you, whether it's hormone or fertility testing, cancer screening, neuro-diversity coaching or something that matters for you. • A range of salary sacrifice options to help you make tax efficient savings on electric cars, nursery schemes, home and tech goods. • Around the World scheme - 3 months work from anywhere scheme • Mental wellbeing support – Access therapy and mental health sessions through Spill • Learning and development – £1,000 personal development budget to help you grow in your role. • Private health care - Enjoy all the benefits AXA has to offer, including reduced gym memberships and medical history disregarded • Medical cash plan - To help you with the costs of dental and optical expenses • Life insurance and Income Protection- four times your annual salary for peace of mind • Matched pension contributions up to 5% • 25 days holiday - plus bank holidays, well-being days and volunteering days • Enhanced Parental Leave – enhanced maternity, paternity and adoption pay. • All are welcome. • All are welcome. • At Flagstone, we’re assembling a diverse team that defies our industry’s norms. Think this role could suit you? We encourage you to apply, no matter your background.
Responsibilities
• Maintain and improve our Microsoft Sentinel deployment - writing and tuning detection rules, managing data connectors, and reducing alert noise • Operate and optimise Defender XDR and Defender for Cloud, including policy management and posture recommendations • Harden our Azure environment across identity, access management, networking, storage, WAF configuration, and logging pipelines • Contribute to infrastructure-as-code (Terraform or Bicep) for security tooling deployments and configuration drift management • Investigate suspicious activity surfaced through Sentinel and Defender - triage, escalate, or contain as appropriate • Support incident response activities including containment, evidence gathering, and post-incident review • Participate in security risk assessments and threat modelling exercises across new and existing systems • Coordinate penetration test engagements (scope, logistics, findings review) and work with engineering teams to prioritise remediation
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