Principal Site Reliability Engineer, Infrastructure Architecture - AI Infrastructure Operations
Nscale is a London-based, full-stack AI cloud and infrastructure company that provides GPU compute, managed AI services, orchestration software, data centers, and power infrastructure for AI training, fine-tuning, and inference.
Funding history
About Nscale
Nscale builds and operates vertically integrated AI infrastructure spanning software, GPU compute, networking, storage, purpose-built data centers, and power. Its active cloud platform offers self-service inference endpoints, fine-tuning, managed Kubernetes and Slurm, virtual machines, and GPU clusters.
Skills
About the Role
You will be the architectural authority for how the AI and HPC platform is designed, connected and recovered. You will own the reference architecture, define failure domains and trust boundaries, lead architecture reviews, write RFCs and ADRs, join major incidents when root causes are architectural, run DR tests and game days, and mentor senior engineers in systems design.
Requirements
- 10+ years building and running large-scale production infrastructure, including several years at staff, principal or architect level
- Track record of production architectures you designed
- Led major incidents and large migrations or site bring-ups
- Knowledge of change management, staged rollouts, SLO-based alerting and post-incident reviews
- Deep expertise in distributed systems design
- Strong networking fundamentals including L3 fabrics, BGP, EVPN/VXLAN
- Experience designing secure multi-tenant platforms
- Clear technical writing
- Ability to drive architectural decisions across teams without direct authority
- Strong software engineering skills
Responsibilities
- Own the end-to-end reference architecture for AI and HPC infrastructure
- Design multi-site and multi-region topologies including failure domains and tenant isolation
- Separate control plane from data plane by design
- Define target-state architecture and multi-year roadmap
- Lead architecture reviews and write and approve RFCs and ADRs
- Set architectural standards including SLOs, observability, capacity models and failure modes
- Run pre-mortems and red-team reviews on major designs
- Join major incidents when the root cause is architectural
- Co-own the operating model including ORR, PIR standards and break-glass policy
- Plan and review site bring-ups, fleet upgrades and migrations
- Run DR tests and game days
- Mentor senior engineers in systems design
Benefits
- Competitive package (base + equity) with reviews every 12 months
- Flexible workplace
- Remote-first team
- Medical, dental, vision
- Flexible paid time off
- Parental leave
- Retirement plan participation