Lead research on AI, cybersecurity, and systems security, developing prototypes, experiments, and systems that influence Horizon3’s technology.
Compensation
Base salary range: $174,191 - $249,230 annually. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills. Additional compensation: All full-time roles are eligible for an equity package in the form of stock options.
Responsibilities
Identify, formulate, and drive research problems at the intersection of AI, cybersecurity, and computer systems.
Translate real technical challenges from Horizon3's products, security environments, and research agenda into well-defined research questions.
Independently develop research directions, technical hypotheses, and experimental plans.
Design and lead rigorous experiments in controlled and representative environments.
Build research prototypes and technical systems, or provide sufficient technical direction for others to implement and evaluate them.
Requirements
Bachelor's in Computer Science or equivalent technical experience
Lead end-to-end red team operations and intelligence-led Purple Team exercises across cloud, CI/CD, endpoint, identity, application, and AI environments.
Responsibilities
Lead end-to-end red team operations and intelligence-led Purple Team exercises
Develop command-and-control tooling, implants, payload delivery mechanisms, and operator workflows
Red team AI systems including internal copilots, agentic workflows, and MLOps environments
Use AI tools to improve research, automation, payload development, reporting, and operational planning
Translate red team findings and threat intelligence into clear engineering actions
Lead the cyber defense function for Amex GBT, overseeing incident response, threat intelligence, detection engineering, and data security investigations across a global business.
Compensation
The US national base salary range for this position is from $130,200.00 - $241,800.00
Responsibilities
Lead and grow four connected cyber defense teams
Set vision, roadmap, and budget for cyber defense capabilities
Hire, coach, and develop team leads and analysts
Define and track metrics for incident response and detection
Build relationships with IT, Legal, Privacy, HR, Fraud, and business unit leaders
Requirements
Bachelor's degree in a related field or equivalent experience
Security Operations Engineer at Samsara, responsible for triaging and investigating security alerts, incident response, and improving security tools and workflows.
Locations (2)
London, England, United Kingdom
United Kingdom
Responsibilities
Monitor, triage and investigate security alerts across identity, endpoint, email, SaaS and cloud environments
Own routine investigations and incidents through to a documented outcome
Support experienced responders during major security incidents
Maintain clear investigation records and provide useful updates and handovers
Improve runbooks, help tune detections, and contribute small scripts or automated workflows
Senior Detection Engineer develops, validates, deploys, and tunes detection logic supporting proactive threat hunting across federal and critical infrastructure environments.
Compensation
The salary associated with this position ($122,000-$253,000) is commensurate with the selected candidate’s qualifications, years of relevant experience, and demonstrated level of expertise.
Responsibilities
Develop and test hypotheses to uncover persistence, privilege escalation, credential access, lateral movement, command and control, and defense evasion.
Build behavioral analytics, correlation rules, signatures, and queries using endpoint, network, identity, cloud, and application telemetry.
Convert validated hunt methods, incident findings, and exercise results into reusable detections.
Test detections against representative malicious and benign activity using historical telemetry, controlled simulations, and purple team exercises.
Design and deploy AI agents that automate risk assessments, evidence collection, control testing, and risk scoring while gathering and visualising security data for executive dashboards and reporting.
Responsibilities
Build and deploy AI agents that automate risk assessments, evidence collection, control testing, and risk scoring
Integrate AI-based software development and agentic AI with cloud platforms, identity systems, and ticketing tools
Develop conversational AI interfaces for risk and compliance teams
Train and enable Security teams to use AI powered tools and measure ROI
Iterate continuously based on user feedback and evaluate emerging AI capabilities
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