Infrastructure Engineer

Design, build, and maintain secure AWS cloud infrastructure using Terraform and Infrastructure as Code (IaC) principles. . Implement and enforce security best practices across cloud platforms, ensuring the confidentiality, integrity, and availability of critical services. . Develop and maintain automation scripts using Python and Bash to improve operational efficiency and strengthen security controls. . Build and support CI/CD pipelines, embedding security into the software delivery life cycle and automating deployment processes. . Deploy, manage, and secure containerised workloads using Docker, ensuring adherence to security and compliance standards. . Monitor infrastructure and cloud environments, proactively identifying and remediating vulnerabilities, misconfigurations, and security risks. . Manage and improve Identity and Access Management (IAM) controls, ensuring least-privilege access across environments. . Collaborate with development, platform, and security teams to design and implement secure-by-default solutions. . Support incident response activities, troubleshooting security and infrastructure issues and driving root cause analysis. . Champion continuous improvement through automation, infrastructure standardisation, and cloud security best practices.

Strong experience with AWS Cloud services and cloud security. . Proven expertise in Terraform and Infrastructure as Code. . Strong Scripting skills in Python and Bash. . Experience building and supporting CI/CD pipelines. . Hands-on experience with Docker and container security. . Strong understanding of security principles, infrastructure hardening, vulnerability management, and IAM. . Experience administering and securing Linux environments.

Please be aware that this role can only be worked within the UK and not Overseas.

Disability Confident

As a member of the Disability Confident Scheme, Companies House guarantees to interview all candidates who have a disability and who meet all the essential criteria for the vacancy. In cases where we have a high volume of candidates who have a disability who meet all the essential criteria, we will interview the best candidates from within that group. This scheme encourages candidates with a disability and/or neurodivergence to apply. In exceptional circumstances, we may also need to apply the desirable criteria in our shortlisting process which may include holding active security clearance.

Armed Forces Covenant/Commitment

Companies House guarantees to interview veterans or spouses/partners of military personnel who meet all the essential criteria for the vacancy. In cases where we have a high volume of ex-military candidates/military spouses or partners, who meet all of the essential criteria, we will interview the best candidates from within that group. In exceptional circumstances, we may also need to apply the desirable criteria in our shortlisting process which may include holding active security clearance.

In applying for this role, you acknowledge the following “this role falls in scope of the Off Payroll Working in the Public Sector legislation. Any rates of payment quoted will reflect the gross rate per day for the assignment and will be subject to appropriate taxes and statutory costs. As such the payment to the intermediary and your income resulting from this contract will be different”.

Cardiff, Wales Contract Posted by: Alexander Mann Solutions - Public Sector Resourcing Posted: Monday, 10 August 2026

On behalf of Companies House, we are looking for a Infrastructure Engineer Inside IR35 for a 6 moths contract based remotely.

SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active SC clearance.

Companies House drives confidence in the economy and makes the UK a great place to start, and run, a business.

As an executive agency sponsored by The Department for Business and Trade (DBT) we have the ability to play a leading role in the right against corrupt business practices by providing the transparency and clarity necessary for the UK to continue to be regarded as a world-leading place to do business.

Companies House is undergoing an historic change - to our systems, culture, services, and ways of working. Our people are at the heart of these changes.

The Economic Crime and Corporate Transparency Act (2023) gives Companies House the power to play a more significant role in disrupting economic crime and supporting economic growth.

These changes represent the biggest opportunity for Companies House in almost 170 years. This move will help us achieve the kind of culture we want - one which drives high performance and where our brilliant people can flourish.