Mountain Warehouse
IT Core Systems Engineer
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Application Deadline: 21 September 2026
Department: IT
Location: London
Description
We are looking for an experienced Core Systems Engineer to help design, deliver, and support infrastructure platforms that are highly available, secure, and resilient.
This role is focused on infrastructure modernisation and project delivery, covering hybrid infrastructure, identity services, datacentre operations, resilience, and platform improvement initiatives. You will play a key role in shaping the future direction of our core systems as we continue evolving towards a more modern, secure, and cloud-aligned technology estate.
While there is an element of BAU support and operational ownership, the role is primarily centred around delivering strategic infrastructure improvements and engineering-led projects.
Key Responsibilities
- Delivering projects to improve identity, infrastructure, and core systems architecture, following modern security and operational best practices
- Leading infrastructure modernisation initiatives, including service migrations, platform improvements, and resilience enhancements
- Designing, implementing, and validating disaster recovery and failover solutions across core systems
- Owning and maintaining core infrastructure platforms across hybrid and datacentre environments
- Supporting the business transition towards modern infrastructure and cloud-aligned services
- Producing and maintaining high-quality technical documentation, standards, and operational procedures
- Acting as an escalation point for complex 3rd line infrastructure issues where required
- Contributing to platform stability, security, scalability, and operational resilience across the wider estate
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Mandatory Experience
We would like to meet someone who is
We are specifically looking for someone who has experience with:
- Identity platform redesign, migration, consolidation, or security hardening initiatives
- Designing and testing disaster recovery and failover processes within production environments
- Delivering or contributing to security-focused infrastructure initiatives
- Supporting and improving enterprise infrastructure platforms across hybrid environments
- Working with a broad range of infrastructure technologies, including identity, virtualisation, storage, networking, and backup systems
- Enterprise networking fundamentals, including routing, segmentation, DNS, and firewall concepts
Working Style
- Project-driven environment with a high level of ownership and accountability
- Small engineering team with the autonomy to deliver meaningful technical improvements
- Primarily remote working, with on-site attendance once per week (or as required) at the London office and datacentre
- Participation in an on-call rota and occasional out-of-hours work
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Who Are We Looking For?
- 5+ years’ experience within core infrastructure, systems engineering
- Able to identify weaknesses or inefficiencies within existing platforms and drive improvements
- Focused on reducing complexity, improving maintainability, and lowering operational overhead
- Comfortable taking ownership of systems, platforms, or technical deliverables with minimal supervision
- Able to work from defined technical requirements and low-level designs while ensuring high implementation standards
- Strong analytical and problem-solving skills, with a structured and methodical approach
- Security-conscious, designing solutions with resilience, recoverability, and operational stability in mind
- Comfortable operating as a trusted technical contributor within a wider engineering team
- Strong communication and documentation skills across both technical and non-technical audiences
- Motivated to continuously learn and develop through both self-led study and formal training
Benefits
- Competitive salary and benefits package
- Hybrid - primarily remote working but on-site attendance once per week (or as often as work requires) to the London office and Datacentre
- Holiday allowance
- 50% staff discount & 25% for family and friends
- Pension scheme
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