AWS Cloud Security Engineer for OT-Grid & Multi-Account

ON.energy; Argentina; On-site; ARS 136,147,000 - 196,657,000; Full time

Job summary

ON.energy is revolutionizing energy and AI infrastructure with hyperscale power systems and secure, resilient data centers worldwide. This senior security role focuses on cloud security in multi-account AWS environments, delivering infrastructure as code and rigorous identity controls.

You will own security tooling, threat detection, and site-to-cloud connectivity, partnering with IT and OT teams to protect critical facilities and data across global campuses.

Qualifications

• 5+ years in cloud security or cloud operations with deep AWS hands-on experience.
• Production experience in multi-account AWS environments.
• Ability to map intrusion paths and explain detection/mitigation steps.
• Strong English (B2-C1) for daily work and security documentation.
• Experience with IAM Identity Center and external IdP integrations.

Responsibilities

• Design and implement multi-account AWS security foundations using infrastructure as code.
• Enforce security standards and review gates to block risky changes.
• Manage AWS identity and access using IAM Identity Center and Entra ID.
• Own cloud-to-site connectivity and segmentation between IT and OT.
• Develop threat detection, monitoring, and mitigation using GuardDuty, Detective, Security Hub, etc.
• Lead vulnerability management across workloads and dependencies.

Skills

Cloud security

AWS

Security infrastructure

Networking security

English (B2-C1)

Tools

AWS

CDK

CloudFormation

Terraform

GuardDuty

Job description

ON.energy is revolutionizing energy and AI infrastructure with hyperscale power systems and secure, resilient data centers worldwide. This senior security role focuses on cloud security in multi-account AWS environments, delivering infrastructure as code and rigorous identity controls.

You will own security tooling, threat detection, and site-to-cloud connectivity, partnering with IT and OT teams to protect critical facilities and data across global campuses.