Senior Linux Infrastructure Engineer – Secure Gov Cloud

ByDesign Secure Systems Ltd; City Of London; Hybrid; GBP 65,000 - 90,000; Full time

Job summary

ByDesign Secure Systems Ltd in London is seeking an experienced Infrastructure Engineer to design, build, and support secure, scalable Linux infrastructure for air-gapped government systems. You will administer IdM, Keycloak, BIND, Guacamole, and patch and harden RHEL systems while aligning with enterprise standards.

The role requires hands-on expertise in Ansible, Terraform, and IaC, with experience in regulated environments and limited connectivity.

Qualifications

• Proven hands-on experience as an Infrastructure or Linux Engineer in enterprise environments.
• Hands-on knowledge of Red Hat IdM, Keycloak, BIND DNS and Guacamole.
• Practical hands-on knowledge of IaC automation (Ansible) and strong experience with GitLab.
• Experience working in environments without direct internet connectivity.
• Confident working within highly regulated or classified environments where reliability and compliance are paramount.
• Strong communicator — able to bridge technical and Non-Technical stakeholders effectively.
• Good standard of written communication to enable high quality design outputs to be produced.

Responsibilities

• Design, build, and support secure, scalable, and highly available Linux infrastructure services for critical air-gapped environments.
• Administer and maintain Red Hat IdM and Keycloak platforms, providing resilient identity, authentication, and access management services.
• Deploy, manage, and support Apache Guacamole and BIND DNS services, ensuring secure remote access and reliable enterprise name resolution.
• Operate and maintain solutions within disconnected, air-gapped, and security-sensitive environments, ensuring compliance with organisational security requirements.
• Collaborate with architecture, security, and engineering teams to deliver infrastructure solutions aligned with enterprise standards and best practices.
• Administer and optimise Red Hat Enterprise Linux (RHEL) systems, including patching, hardening, lifecycle management, and vulnerability remediation.
• Implement and maintain infrastructure automation and configuration management using tools such as Ansible, Terraform, and shell scripting.
• Monitor, troubleshoot, and resolve platform and service issues, providing second- and third-line support for business-critical systems.
• Develop and maintain technical documentation, including High-Level Designs (HLDs), Component-Level Designs (CLDs), Low-Level Designs (LLDs), operational procedures, and support runbooks.
• Produce and present technical designs, implementation plans, and service improvements through governance and Technical Design Authority (TDA) processes as required.

Skills

Linux

Red Hat IdM

Keycloak

BIND DNS

Guacamole

Ansible

Terraform

Shell scripting

GitLab

Air-gapped environments

Tools

GitLab

Terraform

Ansible

Shell scripting

Job description

ByDesign Secure Systems Ltd in London is seeking an experienced Infrastructure Engineer to design, build, and support secure, scalable Linux infrastructure for air-gapped government systems. You will administer IdM, Keycloak, BIND, Guacamole, and patch and harden RHEL systems while aligning with enterprise standards.

The role requires hands-on expertise in Ansible, Terraform, and IaC, with experience in regulated environments and limited connectivity.