Sr. Infrastructure Security Engineer
The full posting
SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
SR. INFRASTRUCTURE SECURITY ENGINEER
We are seeking a talented and motivated Infrastructure Security Engineer to join our security team. In this role, you will design, implement, and maintain secure cloud and hybrid infrastructure, and ensure the integrity of our cloud-native applications.
This role focuses on securing critical infrastructure across multi-cloud and hybrid environments, with work that may span platforms such as SpaceXSI, X Social, X Money and related systems. You’ll operate with an automation-first mindset: building secure foundations, hardening platforms at scale, and partnering closely with engineering teams so security is embedded in how we build and run systems - not bolted on after the fact.
RESPONSIBILITIES
- Design and implement secure cloud architectures across multiple cloud platforms (e.g., AWS, GCP, Azure)
- Build and secure mission-critical applications in hybrid cloud and on-premises environments
- Develop and maintain Infrastructure as Code (IaC) templates with embedded security controls
- Assist with regular security assessments and audits of cloud infrastructure and services
- Implement and manage cloud security tools and services (e.g., CSPM, CWPP, CASB)
- Manage identities and roles effectively across cloud and hybrid environments
- Monitor and remediate infrastructure to comply with regulations and best practices (e.g., PCI, NIST CSF, GDPR, HIPAA)
- Design and implement secure container standards and automation that enable frictionless developer workflows
- Maintain Kubernetes security aligned with current best practices
- Collaborate with development teams to ensure security best practices are integrated into CI/CD pipelines
- Secure and enhance CI/CD pipelines; integrate and maintain code scanning platforms
- Monitor and respond to security events and incidents in cloud and hybrid environments
- Maintain SIEM data pipelines needed for reliable alerting
- Build, deploy, and maintain security operations infrastructure using Python, Terraform, and configuration management (e.g., Puppet)
- Develop dashboards and alerts from security metrics
- Develop and maintain cloud security policies, standards, and procedures
- Own security projects end to end: identify issues and implement solutions
- Stay current with emerging cloud security threats and mitigation strategies
BASIC QUALIFICATIONS
- Bachelor's degree in computer science, cybersecurity, or a related field
- 5+ years of experience in cloud security, infrastructure security, or other security roles
- Experience with Infrastructure as Code tools (e.g., Terraform, CloudFormation)
- Experience with scripting languages (e.g., Python, Bash) for automation and tool development
PREFERRED SKILLS AND EXPERIENCE
- Strong understanding of cloud security principles, compliance frameworks, and best practices
- Proficiency in at least one cloud platform (AWS, GCP, or Azure) and associated security services
- Proven experience securing hybrid AWS/on-premises (or multi-cloud) environments, including IAM and overall security posture
- Familiarity with containerization technologies and their security implications
- Knowledge of network security concepts and protocols
- Proactive mindset with strong ownership, critical thinking, and problem-solving skills
- Relevant security certifications (e.g., CCSP, CSSK, AWS Security Specialty)
- Deep expertise in Kubernetes and container security
- Experience with multi-cloud environments and cloud-to-cloud security
- Knowledge of CI/CD best practices and tools
- Familiarity with regulatory compliance requirements (e.g., GDPR, HIPAA, PCI DSS, NIST CSF)
- Strong proficiency with Python, Terraform, and configuration management (e.g., Puppet)
- Hands-on experience building GitHub Actions and workflows
- Experience with observability and security operations tooling (e.g., Prometheus, Grafana, CloudWatch, Karma; SIEM platforms such as Wazuh)
- Experience in building custom cloud security tools or integrations
- Interest in leveraging AI for cloud security monitoring and automation
- Contributions to open-source cloud security projects
- Experience with securing AI/ML workloads in cloud environments
- Experience in banking, money transmission, P2P payments, or similarly regulated financial platforms.
ADDITIONAL REQUIREMENTS
- Located in the EU/UK or willing to relocate
SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice .
Text as xAI published it; last compared with the original on 13 Nov 2026.
The application
Your details and CV, then 6 questions (2 written).
- 1.Google ScholarShort answer · optional
- 2.Please select if you are a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or (v) eligible to obtain the required authoriChoose one
- 3.Have you worked with us before?Choose one (7 choices)
- 4.What exceptional work have you done?Written answer
- 5.What makes you the ideal candidate for this position?Written answer · optional
- 6.If you are not currently residing near one of our EU/UK office locations, are you willing to relocate to support full-time on-site work (5 days per week) in our office?Choose one: Yes · No · I currently live near an office location
Taken from xAI's application form as it stood on 11 Nov 2026.
The employer: xAI
Builds the Grok models and runs X; its security team covers federal and fintech GRC, AppSec for X Money, IAM and infrastructure security.
Pay and benefits: In-office, salaried full-time roles with equity.
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