Site Reliability Engineer: Reliability & Observability

Castelion; Allen (TX); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Generous benefits package

Job summary

Castelion seeks a Site Reliability Engineer to own the reliability, performance, observability, and operational health of Castelion's critical engineering systems. These systems support software development, CI/CD, artifact distribution, test infrastructure, developer workflows, and other services that engineers depend on to deliver hardware and software.

This role is the missing reliability piece of an existing high-performing engineering organization.

Qualifications

• 5+ years in Site Reliability Engineering or related field.
• Strong Linux systems expertise and performance concepts such as IOPS, throughput, latency, queue depth, and connection concurrency.
• Experience building observability, monitoring, alerting, and incident response systems.
• Strong networking and application fundamentals (TCP, TLS, HTTP, DNS, proxies, load balancers).
• Ability to collaborate across engineering teams and drive root cause analysis and corrective actions.

Responsibilities

• Establish reliability, availability, latency, capacity, and recovery expectations with meaningful health indicators.
• Lead technical investigations and incident response across multi-layer systems; collect evidence and drive resolution.
• Build and improve monitoring/diagnostic systems to detect problems early.
• Analyze system performance across compute, memory, storage, network; identify limits and address them.
• Drive root cause analysis and postmortems with preventive actions implemented.
• Partner with DevOps, Cloud, Software, Security, Test, and IT to resolve cross-team issues.
• Operate and incrementally improve systems built by other engineers.
• Participate in on-call rotation for critical services.

Skills

Linux systems

Observability & monitoring

Networking fundamentals

Incident response & RCAs

Cross-functional collaboration

Education

Bachelor's degree in CS/CE

Master's degree in CS/CE

PhD in a related field

Job description

Castelion seeks a Site Reliability Engineer to own the reliability, performance, observability, and operational health of Castelion's critical engineering systems. These systems support software development, CI/CD, artifact distribution, test infrastructure, developer workflows, and other services that engineers depend on to deliver hardware and software.

This role is the missing reliability piece of an existing high-performing engineering organization.