Senior CSIRT Analyst at G-Research | GB | Rezi

Senior CSIRT Analyst at G-Research

Senior CSIRT Analyst

G-Research · GB

2 weeks ago

Senior CSIRT Analyst

G-Research · GB

15 days ago
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About the Role

As a Senior CSIRT Analyst, you will play a key role in G-Research’s Cyber Security Incident Response Team (CSIRT), specializing in cloud detection and response across AWS and hybrid environments. You will investigate, respond, and proactively hunt for threats across a diverse technology landscape, including high-performance compute clusters, Kubernetes and containerized infrastructures, and corporate Windows environments. You will use cloud-native security tooling and multi-SIEM operations to strengthen detection and response capabilities. You will also participate in purple team and red team exercises, continuously validating and improving the team’s effectiveness against advanced adversaries. As a senior member of the team, you will also mentor junior analysts, contribute to automation initiatives, and support the on-call escalation rota for out-of-hours response.

Responsibilities

  • Investigating and responding to complex security incidents across cloud, hybrid, and on-premise environments
  • Proactively hunting for threats and developing detection logic across SIEM and cloud security systems
  • Participating in red and purple team exercises to test, validate and enhance detection and response capabilities
  • Developing and maintaining automation workflows using tools such as Tines and Python
  • Collaborating with engineering teams to improve log ingestion, detection rules and platform reliability
  • Mentoring and supporting junior analysts through knowledge sharing and technical guidance
  • Participating in the on-call escalation rota for out-of-hours incidents
  • Improving CSIRT processes, playbooks and threat models

Requirements

  • Significant experience in cyber incident response, detection engineering or SOC and CSIRT operations
  • Strong cloud security expertise across AWS and Azure, including hands-on incident investigation
  • Proficiency with SIEM platforms and log analysis
  • Experience with red and purple team exercises and adversary simulation
  • Knowledge of containerized environments and cloud-native infrastructure security
  • Programming or scripting experience, preferably in Python, and exposure to automation platforms
  • Strong understanding of modern attack techniques, threat actors and the MITRE ATT&CK framework
  • Experience mentoring or leading within a security operations environment
  • Strong analytical skills with the ability to investigate complex threats, identify root causes and operate effectively under pressure
  • Collaborative approach with the ability to work across teams while supporting and developing others
  • Proactive mindset with an interest in automation and continuously improving detection and response

Skills

  • AWS
  • Azure
  • Elastic
  • Python
  • Tines
  • MITRE ATT&CK framework

Location

  • London

Work Type

  • Full-time

Experience Level

  • Senior

Salary/Compensations

  • Highly competitive compensation plus annual discretionary bonus

Benefits

  • Lunch provided (via Just Eat for Business)
  • Dedicated barista bar
  • 30 days’ annual leave
  • 9% company pension contributions
  • Informal dress code
  • Excellent work/life balance
  • Comprehensive healthcare
  • Life assurance
  • Cycle-to-work scheme
  • Monthly company events

About the Company

  • We tackle the most complex problems in quantitative finance, by bringing scientific clarity to financial complexity.
  • From our London HQ, we unite world-class researchers and engineers in an environment that values deep exploration and methodical execution - because the best ideas take time to evolve.
  • Together we’re building a world-class platform to amplify our teams’ most powerful ideas.
  • Security is foundational to this mission and must be delivered in a way that supports how our engineering teams build and operate complex systems at scale.

Equal Opportunity

  • G-Research is committed to cultivating and preserving an inclusive work environment.
  • We are an ideas-driven business and we place great value on diversity of experience and opinions.
  • We want to ensure that applicants receive a recruitment experience that enables them to perform at their best.
  • If you have a disability or special need that requires accommodation please let us know in the relevant section