Infrastructure Security Engineer - London

SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge.  Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

ABOUT THE ROLE:

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 SpaceXAI, 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:

Cloud & infrastructure security

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)

Platform, containers & developer enablement

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

Detection, operations & tooling

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

3–5 years of experience in cloud security, infrastructure security, or related roles

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

Experience with Infrastructure as Code tools (e.g., Terraform, CloudFormation)

Familiarity with containerization technologies and their security implications

Knowledge of network security concepts and protocols

Experience with scripting languages (e.g., Python, Bash) for automation and tool …