DevOps Engineer, Engineering Effectiveness (Remote) in London

An online savings platform, reinventing how individuals, businesses, and charities manage, protect, and grow their cash. But high performance takes more than talent – it takes a culture of kindness, respect, and growth. That's why we're building a diverse, inclusive community, where your voice is heard and valued. We may not change the world, but we can change the world of financial technology. And all it takes is a winning mix of drive, talent, and empathy. About the roleWe're looking for a Senior SecOps Engineer to take ownership of security operations at Flagstone. You'll spend real time in the alert queue, as well as building the detections and automation that make it better. You're the go to expert when something serious happens, and you can explain security risk just as clearly to engineers as to senior stakeholders. You're curious about new technology, AI included, and you have a clear view on where it genuinely helps and where it introduces risk. What you'll doYou'll take ownership of our SOC operations and report on their performance and health to stakeholders across the business. You'll own the detection engineering backlog, building, tuning and retiring detections across Microsoft Sentinel and Defender, mapped to a coverage model such as MITRE ATT&CK. You'll turn threat intelligence into detection logic and hunting activity, and drive our automation and SOAR maturity by building Logic App playbooks that reduce manual effort without losing judgement on the nuanced cases. You'll manage our managed SOC relationship day to day: defining scope and escalation criteria, reviewing performance against SLAs and acting as the technical escalation point for anything they can't close. You'll also explore and introduce AI assisted tooling into SOC workflows, such as triage and enrichment copilots, detection authoring and alert summarisation, where it clearly makes a difference, with sensible boundaries on where human judgement stays in the loop. What you'll bring5+ years in a SOC, security operations or detection engineering role, with progression into a senior IC positionHands-on experience with Microsoft Sentinel and Defender, building detections rather than just consuming alertsExperience running investigations and incident response, including communicating with stakeholders under pressureExperience building SOAR and automation content (for example Sentinel Logic Apps), including monitoring for silent failureA strong grasp of attack patterns and MITRE ATT&CK, and how to turn them into a detection coverage modelExperience directing a managed or outsourced SOC or MDR provider, setting scope, SLAs and escalation criteriaPractical experience applying AI or LLM tooling to SecOps workStrong communication and stakeholder skills, with the confidence to influence senior stakeholdersCritical thinking and a real curiosity for new technologies and frameworksIt would be great if you also haveExperience in regulated financial servicesExposure to identity centric detection (Entra ID) and cloud native threat detectionGCIH, GCFA or an equivalent hands-on IR or detection certificationLinks to the SOC and detection engineering community, through conferences, speaking or open source detection content such as Sigma rulesHow we reward you: Instead, we invest in your health, wealth, and professional development. Hybrid working - Spend at least 1 day a week with your team in our collaborative London officeCompetitive bonus scheme - designed to reward and recognise high performanceFlexible 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 schemeMental wellbeing support – Access therapy and mental health sessions through SpillLearning 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 disregardedMedical cash plan - To help you with the costs of dental and optical expensesLife insurance and Income Protection- four times your annual salary for peace of mindMatched pension contributions up to 5%25 days holiday - plus bank holidays, well-being days and volunteering daysEnhanced Parental Leave – enhanced maternity, paternity and adoption pay.