Senior Infrastructure Engineer

Duration : 12-month fixed-term staff contract (not freelance), with a strong potential for conversion to a permanent role.

Location :
This role is based in our office located in Hammersmith, London + 1 day remote work per week

Assala Energy is a dynamic Oil and Gas Exploration and Production company committed to the sustainable development of its assets in Gabon. We value a collaborative approach, promote diversity, and prioritize safety and integrity in all our operations.

We are looking for a highly motivated and experienced Senior Infrastructure Engineer to join our global IT team. The successful candidate will play a key role in designing, implementing, maintaining, and supporting our entire IT infrastructure, which supports our business operations across multiple international locations.

This is a practical role requiring a combination of deep technical expertise in Microsoft, VMware, and Cloud technologies, strategic thinking, and the ability to work effectively in a fast-paced, international setting. The ideal candidate will be a proactive problem-solver, a mentor to junior team members, and a driving force in the ongoing improvement of our IT services.

• Design, build, and maintain the company's global IT infrastructure, including on-premises HPE / Dell server and storage hardware, co-located data centres, and cloud-based systems.
• Manage and administer our hybrid cloud environment, with a strong focus on Microsoft Azure, Entra , and Azure MDM for modern device management.
• Ensure the security of our infrastructure and data by managing on-premises and cloud security controls, and working closely with the Security Operations Centre (SoC) to action vulnerability management and system patching.
• Manage and maintain our Windows and Linux (CentOS, Red Hat, Ubuntu) server estate, as well as core Microsoft services (AD, GPO, DNS, NPS / Radius, CA, SMTP Relay), and our extensive VMware vSphere / vCenter virtualisation platform.
• Administer and optimise our System Centre Configuration Manager (SCCM) hierarchy, including Primary / Secondary sites, Distribution Points, Cloud Management Gateway (CMG), and Azure integration for global software deployment and updates.
• Manage and maintain our VDI environment (VMware Horizon / Citrix / OLVM), ensuring a reliable experience for our global user base.
• Take ownership of the company’s backup and disaster recovery solutions, primarily using Veeam, and manage our tape library infrastructure.
• Provide 3rd line support for complex technical issues, acting as an escalation point for the service desk and junior engineers.
• Plan and execute infrastructure projects, including upgrades, migrations, and new implementations.

• Collaborate with international teams to ensure the seamless delivery of IT services to all global employees.
• Address the challenges of a distributed workforce, utilising technologies like SCCM CMG, and VDI for remote access and device provisioning.
• Navigate the complexities of regional IT regulations and data sovereignty requirements (e.g., GDPR).
• Contribute to the development of the global IT roadmap and strategy, identifying opportunities for innovation and improvement.
• Manage relationships with third‑party vendors and service providers across different regions.

• Act as a technical lead and mentor for junior infrastructure engineers, fostering a culture of knowledge sharing and professional development.
• Create and maintain comprehensive documentation for infrastructure, systems, and procedures within our knowledge base to ensure accurate and up-to-date information.
• Lead by example in promoting best practices for IT security, service management (ITIL), and project management.

Extensive experience (typically 7+ years) in a senior infrastructure engineering role, preferably within a global or multi‑site SME.

• In‑depth knowledge of Active Directory, Group Policy Objects (GPOs), DNS, NPS (Radius), Certificate Authorities (CA), and SMTP relays. Strong scripting and automation skills using Power Shell.

• Proven…