Lead Detection & Response Security Engineer

Circle; Boston (MA); On-site; USD 150,000 - 230,000; Full time

Job summary

Circle is a leading internet financial platform expanding across major jurisdictions, offering a regulated stablecoin network and blockchain-enabled fintech products. This Principal Security role focuses on protecting Circle’s ecosystems across blockchain, cloud, and AI tooling, with on-call duties and a strong emphasis on incident response and proactive threat discovery.

You will build deep detections, lead cross-team security initiatives, and guide security practices for engineers and

Qualifications

• 10+ years of experience in detection, response, or security engineering.
• 3+ years of experience commanding security incidents, especially involving engineering.
• Deep cloud security knowledge in AWS environments: IAM, KMS, EKS, CSPM tooling.
• Working knowledge of blockchain and crypto-native threats; defending blockchain or DeFi infra.
• Hands-on with AI tooling to address threats and accelerate work.
• Extensive knowledge of SIEM, Case Management, and SOAR solutions.

Responsibilities

• Lead projects and deliverables for the security program across teams.
• Proactively identify and respond to emerging security threats across cloud, endpoint, blockchain, and AI.
• Develop detection for AWS, EKS, and cloud-native attacks; IAM, identity federation, runtime exploits.
• Extend detection for AI-specific risks and integrate into SOC workflows.
• Lead incident responses and collaborate to resolve issues.
• Provide security guidance across the company including threat modeling and audits.

Skills

Security engineering

Incident leadership

AWS security

SIEM/SOAR

Python/Golang

AI security tooling

Threat modeling

Team collaboration

Tools

Panther

Tines

Job description

Circle is a leading internet financial platform expanding across major jurisdictions, offering a regulated stablecoin network and blockchain-enabled fintech products. This Principal Security role focuses on protecting Circle’s ecosystems across blockchain, cloud, and AI tooling, with on-call duties and a strong emphasis on incident response and proactive threat discovery.

You will build deep detections, lead cross-team security initiatives, and guide security practices for engineers and