Platform Architect

Work on Technology That Protects What Matters

At Si Xworks , we build secure digital solutions that support Defence and National Security missions
. Our teams work on complex problems where reliability, security, and speed of innovation matter.

We are seeking an experienced and forward-thinking Platform Architect to define and evolve the strategic direction of our platforms, automation capabilities, and engineering practices. This role sits at the intersection of architecture, platform engineering, and reliability, ensuring that our platforms are secure, scalable, and designed to enable development teams to deliver high-quality solutions efficiently.

• Define and own the platform architecture strategy, ensuring alignment with business and technology objectives.
• Design end-to-end platform solutions covering infrastructure, automation, CI/CD, and operational tooling.
• Establish architectural principles, patterns, and standards (e.g., IaC, Git Ops, immutable infrastructure).
• Drive consistency, reuse, and standardisation across platforms and environments.
• Evaluate emerging technologies and guide their adoption through proof of concepts and strategic roadmaps.
• Work with architects and principle architects across practices and to define roadmaps and architecture

• Provide technical direction for CI/CD pipeline design, automation frameworks, and Infrastructure as Code practices.
• Ensure platforms are designed for scalability, resilience, and operational efficiency.
• Champion automation-first approaches to reduce manual effort and increase reliability.
• Oversee the design and implementation of reusable platform components and shared services.

• Act as a design authority for platform-related initiatives, reviewing and approving architectural decisions.
• Ensure solutions meet non-functional requirements including performance, scalability, security, and maintainability.
• Produce and govern high-quality architectural artefacts (diagrams, standards, reference architectures).
• Lead design workshops and contribute to technical decision-making across projects.

• Work closely with engineering, development, operations, and security teams to ensure alignment and successful delivery.
• Provide mentorship and technical leadership to Platform Engineers and wider engineering teams.
• Promote Dev Ops and SRE best practices across the organisation.
• Enable teams by defining clear platform capabilities, usage patterns, and self-service models.
• Ensure secure-by-design principles are embedded in all platform architectures.
• Guide platform-level security controls, identity management, and compliance requirements.
• Oversee vulnerability management strategies and platform hardening approaches.
• Align platform design with regulatory and organisational compliance standards.

We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges, we’re particularly interested in people with skills/experience in:

• Extensive experience designing and implementing platform architectures in Agile/Dev Ops environments.
• Strong expertise in Infrastructure as Code (Terraform, Ansible, ARM, DSC, or equivalent).
• Deep knowledge of CI/CD tooling and delivery patterns (Git Lab CI/CD, Jenkins, Git Hub Actions).
• Experience with containerisation and orchestration platforms (Docker, Kubernetes, Podman).
• Strong understanding of cloud and hybrid infrastructure (Azure, Azure Stack Hub, or similar).
• Proficiency in scripting and automation (e.g., Python, Power Shell, Bash).
• Experience designing secure, scalable, and highly available systems.
• Strong documentation and communication skills, with the ability to produce clear architectural artefacts.
• Ability to influence, guide, and align multiple teams and stakeholders.

SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus on digital experimentation, secure-by-design architecture, cloud…