Mountain Warehouse
IT Core Systems Engineer
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IT Core Systems Engineer
Core Systems Engineer
Department: IT
Location: London
Application Deadline: 2 August 2026
About the Role
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 focuses 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 while transitioning towards a modern, secure, and cloud-aligned technology estate.
Responsibilities
- Deliver projects to enhance identity, infrastructure, and core systems architecture while adhering to modern security and operational best practices.
- Lead infrastructure modernisation initiatives, including service migrations, platform improvements, and resilience enhancements.
- Design, implement, and validate disaster recovery and failover solutions across core systems.
- Own and maintain core infrastructure platforms across hybrid and datacentre environments.
- Support the business transition towards modern infrastructure and cloud-aligned services.
- Produce and maintain high-quality technical documentation, standards, and operational procedures.
- Act as an escalation point for complex 3rd-line infrastructure issues.
- Contribute to platform stability, security, scalability, and operational resilience across the wider estate.
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Mandatory Experience
Key Requirements:
We seek an engineer with the following experience:
- Identity platform redesign, migration, consolidation, or security hardening initiatives.
- Designing and testing disaster recovery and failover processes in production environments.
- Delivering or contributing to security-focused infrastructure projects.
- Supporting and improving enterprise infrastructure platforms in hybrid environments.
- Experience across a broad range of infrastructure technologies, including:
- Identity management
- Virtualisation
- Storage systems
- Networking (routing, segmentation)
- DNS
- Firewall concepts
- Backup systems
- Strong foundation in enterprise networking fundamentals.
Working Environment
- Project-driven role with high ownership and accountability.
- Small, autonomous engineering team driving meaningful technical improvements.
- Primarily remote with weekly on-site attendance (London office and Datacentre).
- Expected participation in on-call rotation, including occasional out-of-hours work.
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Who We’re Looking For
- 5+ years’ experience in core infrastructure or systems engineering.
- Ability to identify platform weaknesses and drive improvements.
- Commitment to reducing complexity, improving maintainability, and lowering operational overhead.
- Self-driven, with ownership of systems or technical deliverables requiring minimal supervision.
- Able to translate technical requirements and designs into high-standard implementations.
- Strong analytical and problem-solving skills with a systematic approach.
- Security-conscious, prioritising resilience, recoverability, and operational stability.
- Comfortable collaborating as a trusted technical contributor within a broader engineering team.
- Excellent communication and documentation skills for both technical and non-technical stakeholders.
- Motivated to continuously learn and develop through self-study and formal training.
Benefits
- Competitive salary and benefits package
- Hybrid working: Primarily remote, with on-site attendance as required
- Holiday allowance
- 50% staff discount (25% extended to family and friends)
- Pension scheme
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