Principal Sec Engineer, Detection & Response (Blockchain)

Circle; Dublin; On-site; EUR 110,000 - 170,000; Full time

Job summary

Circle is seeking a Principal Security Engineer to lead detection, response, and security engineering across blockchain, cloud, and AI tooling. You will shape detection coverage, incident response, and threat mitigation while collaborating with multiple teams.

The role includes on-call duties during working hours and occasional nights/weekends. The ideal candidate brings 10+ years in security engineering, deep AWS security expertise, and hands-on experience with SIEM/SOAR tools like Panther and

Qualifications

• 10+ years of experience in detection, response, or security engineering.
• 3+ years of experience commanding security incidents, especially those involving engineering.
• Deep cloud security knowledge in AWS environments: IAM, identity federation, KMS, EKS, CSPM tooling.
• Working knowledge of blockchain and crypto-native threats: wallet and custody attack patterns, on-chain monitoring, protocol-level risks.
• Hands-on experience using AI tooling to accelerate work and address threats; understanding shadow AI and related risks.

Responsibilities

• Lead and manage security projects across Circle's threat surfaces including blockchain, cloud, and AI tooling.
• Develop detection coverage and incident response for on-chain, cloud-native, and AI-driven threats.
• Own on-call duties during working hours and periodic nights/weekends to support security operations.
• Collaborate across teams to investigate, resolve incidents, and improve SOC processes.
• Provide security guidance to multiple organizations within Circle; contribute to threat modeling and audits.

Skills

Security engineering

Incident response

Cloud security

Blockchain security

AI tooling

SIEM SOAR

Python/Golang

macOS OS

Detections as Code

Tools

Panther

Tines

AWS

EKS

KMS

GCP

OCI

Wiz (CSPM)

Job description

Circle is seeking a Principal Security Engineer to lead detection, response, and security engineering across blockchain, cloud, and AI tooling. You will shape detection coverage, incident response, and threat mitigation while collaborating with multiple teams.

The role includes on-call duties during working hours and occasional nights/weekends. The ideal candidate brings 10+ years in security engineering, deep AWS security expertise, and hands-on experience with SIEM/SOAR tools like Panther and