Role Description At Nscale, our AI Infrastructure Operations team is responsible for the reliability and scalability of one of the most demanding AI platforms in the industry. We value engineers who think in systems, lead through influence, and raise the bar for operational excellence across the organisation. We’re looking for a Principal Site Reliability Engineer (SRE) to provide technical leadership across our AI Infrastructure Operations domain. This is a senior, highly impactful role focused on setting reliability strategy, designing foundational systems, and driving cross-team improvements at scale. You will operate as a technical authority for reliability, automation, and operational architecture across Nscale’s GPU, network, and control-plane platforms. - Owning and evolving the long-term reliability strategy for Nscale’s AI and HPC infrastructure - Designing and leading the development of large-scale control-plane systems, automation frameworks, and operational tooling - Defining reliability standards, SLO frameworks, and operational best practices used across multiple teams - Acting as a senior technical escalation point during critical incidents, guiding resolution and ensuring systemic fixes - Identifying structural reliability risks and driving cross-functional initiatives to address them at the architectural level - Partnering with Engineering, Network Operations, and Fleet Operations leadership to influence platform design and operational maturity - Mentoring senior and mid-level engineers, raising the overall quality and effectiveness of SRE practices - Driving measurable improvements in availability, MTTR, cost efficiency, and operational scalability Qualifications - 10+ years of experience in Site Reliability Engineering, Systems Engineering, or Software Engineering roles operating complex, large-scale infrastructure - Expert-level software engineering skills, with a strong track record of building production-grade automation and systems - Deep expertise in Linux, networking, and distributed systems design at scale - Extensive experience debugging and resolving failures across hardware, OS, networking, and application layers - Proven ability to lead technical initiatives across teams without direct authority - Strong systems-thinking mindset, with the ability to balance reliability, velocity, and cost Requirements - Deep hands-on experience with AI or HPC platforms, including GPUs, high-speed interconnects (InfiniBand/RDMA), and workload schedulers (e.g. SLURM) - Experience designing observability systems for high-cardinality, high-throughput environments - Familiarity with Kubernetes at scale and hybrid or bare-metal cloud architectures - A history of driving step-change improvements in reliability, scalability, or operational efficiency Benefits - Collaborative, supportive, and innovative environment where your contributions spark real impact - Highly competitive package (base + equity) with reviews every 12 months - Opportunity to join the fastest-growing tech startup, pushing boundaries and collaborating with brilliant minds - Dynamic progression plan tailored to your ambitions - Human-First Flexibility: autonomy to shape your day around life's moments - Thriving remote-first team with seamless virtual collaboration

• Lead the administration and evolution of Microsoft Active Directory in a complex enterprise environment. • Own Exchange and Exchange Hybrid (on-premises and Exchange Online), ensuring reliability, security, and seamless coexistence. • Design, operate, and maintain Public Key Infrastructure (PKI), including certificate lifecycle management. • Administer and develop Microsoft 365 / Entra ID identity services, roles, and access models. • Implement and support ADFS / SSO and federation scenarios for internal and external applications. • Ensure secure access control, authentication, and authorization across platforms. • Collaborate with network, platform, and application teams on identity-related integrations. • Drive continuous improvement of identity and messaging architectures and operational practices.

• Supports the Case Management Modernization (CMM) Program for the U.S. Courts by designing, implementing, and managing secure authentication and authorization frameworks • Ensures compliance with federal identity governance, FedRAMP, and Zero Trust Architecture (ZTA) principles • Collaborates with architecture, security, and DevSecOps teams to ensure access control and credential management are integrated across all layers of the CMM application ecosystem • Designs and maintains the identity architecture utilizing Keycloak • Implements federated identity and single sign-on (SSO) solutions using modern protocols (SAML, OAuth2.0, OIDC) • Configures directory services and identity providers (AWS Cognito, AWS IAM Identity Center, Azure AD, etc.) • Conducts access audits, user entitlement reviews, and anomaly detection to ensure least-privilege compliance

• Craft creative scalable cloud solutions for running millions of jobs, thousands of systems, and petabytes of storage. • Address exciting challenges in infrastructure such as Kubernetes, job scheduling, multi-region services, resource management, and automated recovery. • Create agentic workflows for infrastructure. • Collaborate with customers to understand their needs and develop innovative solutions that cater to their requirements.