Circle

Principal Security Engineer, Detection & Response

Circle
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11 days ago
Remote, United States or Remote, IrelandStaff+
H1B sponsor

Responsibilities

  • Proactively identify and respond to security threats across cloud, endpoint, blockchain, and AI environments.
  • Build detection and response capabilities for blockchain, custody, cloud-native, container, and AI-specific threats.
  • Develop and maintain core SIEM and orchestration tooling and improve infrastructure logging and detection visibility.
  • Lead security incident response, including investigations, cross-team collaboration, and incident command.
  • Advance AI use in SOC detection triage, enrichment, and analyst-acceleration workflows.
  • Develop techniques to identify anomalous behavior and attacks across the environment.
  • Provide security guidance across the company and support threat modeling, vulnerability scanning, audits, and custom tool-building projects.
  • Participate in on-call shifts every third week and provide occasional weekend and nighttime incident support.

Requirements

  • 10+ years of experience in detection, response, or security engineering.
  • 3+ years of experience commanding security incidents, especially incidents involving engineering.
  • Deep AWS cloud security knowledge covering IAM, identity federation, KMS, EKS and container attack patterns, runtime exploitation, and CSPM tooling.
  • Working knowledge of blockchain and crypto-native threats, including wallet and custody attacks, on-chain monitoring, protocol-level risks, and smart contract abuse.
  • Hands-on experience using AI tooling and understanding risks involving shadow AI, agentic workflows, MCP and tool integrations, and AI-driven credential exposure.
  • Extensive knowledge of SIEM, case management, and SOAR solutions.
  • Knowledge of operating systems, file systems, and memory on macOS.
  • Programming experience in Python, Golang, or similar programming languages.
  • Experience building Detections as Code.
  • Familiarity with Slack, Apple macOS, and GSuite.
  • Strong collaboration, prioritization, independent problem-solving, and communication skills during high-stress situations.
  • Experience defending blockchain, custody, or DeFi infrastructure is strongly preferred.
  • Exposure to GCP or OCI is preferred.

Benefits

  • Base pay range is €110,000.00–€170,000.00.
  • Flexible remote work environment.
  • On-call schedule is every third week, with occasional weekend and nighttime incident support.
  • Equal opportunity employment and interview accommodations are available.
Circle

About Circle

1,001-5,000 employees
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