Principal Site Reliability Engineer

GROW WITH US: Tandem Diabetes Care creates new possibilities for people living with diabetes, their loved ones, and their healthcare providers through a positively different experience. We’d love for you to team up with us to “innovate every day,” put “people first,” and take the “no-shortcuts” approach that has propelled us to become a leader in the diabetes technology industry. STAY AWESOME: Tandem Diabetes Care is proud to manufacture and sell the Tandem Mobi system and t:slim X2 insulin pump with Control-IQ+ technology — an advanced predictive algorithm that automates insulin delivery. But we’re so much more than that. Our company’s human-centered approach to design, development, and support delivers innovative products and services for people who use insulin. Because many of our own team members live with diabetes, or have a loved one impacted by diabetes, the work is personal, and we are committed to the cause. Learn more at tandemdiabetes.com A DAY IN THE LIFE: The Principal Site Reliability Engineer (SRE) is responsible for the reliability, availability, and performance of the company's production systems. This role leads day-to-day production support and incident response and progressively replaces reactive firefighting with engineered SRE practice: SLOs, observability, on-call design, runbooks, and automation. It also advances infrastructure automation (Terraform/IaC), CI/CD reliability, disaster recovery, and security and compliance readiness in partnership with cross-functional teams. The role works with a distributed team that includes offshore consulting partners and is expected to raise their capability and independence; success is measured as much by what the team can do without the Principal SRE as by what the Principal SRE delivers personally. The Principal Site Reliability Engineer (SRE)' s at Tandem are also responsible for: Production Support & Incident Management Leads day-to-day production support: intake, triage, prioritization, escalation, queue health, and change execution. Establishes consistent support practices across a distributed team, including shift handoffs, ticket quality standards, and clear ownership of open issues. Leads incident management end-to-end: incident command, stakeholder communication, and blameless postmortems with corrective actions tracked to closure. Participates in and coordinates response activities for production security incidents, partnering with Security teams to contain threats, restore services, validate controls, and implement corrective actions. Owns on-call strategy: rotation design, escalation paths, alert tuning, and tooling (e.g., PagerDuty, New Relic), with explicit goals of reducing alert fatigue and building coverage that works across time zones. Participates as a senior escalation tier for high-severity incidents. Builds runbooks that standardize response to common failure modes and enable first-line resolution by engineers who did not build the system. Reliability Engineering & Observability Defines and owns SLIs and SLOs for critical services, using them to guide monitoring, alerting, and reliability priorities. Drives systemic reduction of MTTD and MTTR through better instrumentation, alerting, diagnostics, and automation. Converts recurring support burden into permanent fixes, automation, or documentation rather than absorbing it as ongoing manual work. Establishes and maintains technology currency and lifecycle management practices for production platforms, ensuring cloud services, Kubernetes clusters, operating systems, runtimes, and infrastructure components remain supported, secure, and aligned with organizational standards. Proactively identifies and mitigates End-of-Life (EOL), End-of-Support (EOS), and technology obsolescence risks. Owns business continuity and disaster recovery readiness for production platforms, including backup and recovery strategies, recovery testing, failover capabilities, recovery runbooks, and adherence to defined RTO/RPO objectives. Infrastructure Automation & CI/CD Leads infrastructure automation with Terraform, ensuring infrastructure is version-controlled, modular, reusable, and auditable, working within and improving existing patterns where they are sound. Eliminates toil through automation, reducing manual, repetitive operational work across the team. Adds reliability guardrails to CI/CD pipelines (automated rollback, change-risk checks, progressive delivery) with the teams that own them. Operational Governance and Compliance Maintains production systems in accordance with applicable regulatory and compliance requirements, ensuring audit readiness and the ongoing effectiveness of access management, change management, logging, vulnerability remediation, patch management, and other operational controls. Maintains documentation and evidence supporting business continuity and disaster recovery controls, including recovery testing results, remediation plans, and audit artifacts. Partners with Security, Quality, and Compliance teams to maintain regulatory compliance, support internal and external audits, and drive timely resolution of audit findings and remediation activities. Leadership, Mentorship & Collaboration Actively grows the capability of SRE and DevOps engineers, including consulting-partner engineers, through pairing, design and code review, and incident debriefs. Creates conditions in which junior and contract engineers raise concerns and disagree openly, recognizing that silent agreement is a production risk. Communicates in a documentation-first manner suited to a distributed, multi-time-zone team, so context is durable rather than held by one person. Partners with software engineering, QA, and architecture to embed reliability and operability into the development lifecycle rather than only after incidents. Contributing Responsibilities (partners with other owners) : Informs capacity planning and scalin