Site Reliability Engineer - Reliability & Observability Lead

Castelion Corporation; Northern (KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Castelion is moving incredibly fast to develop and deliver advanced defense systems. This opportunity lets you join early, own meaningful pieces, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of Castelion.

As a Site Reliability Engineer, you will own the reliability, performance, observability, and operational health of Castelion's critical engineering systems.

Qualifications

• Bachelor's, Master's, or PhD in Computer Science, Computer Engineering, or a related technical field.
• 5+ years of experience in Site Reliability or related engineering disciplines.
• Strong Linux systems expertise and fundamentals across compute, memory, storage, and networks.

Responsibilities

• Establish reliability, availability, latency, capacity, and recovery expectations for critical services with measurable health indicators.
• Lead deep technical investigations and incident response across application, Linux, networking, storage, Kubernetes, and cloud boundaries.
• Build and improve monitoring and diagnostic systems to detect problems before users report them.
• Analyze system performance and capacity; apply optimal solutions including scaling, caching, or architecture changes.
• Drive root cause analysis and postmortems with corrective actions to reduce recurrence.
• Partner across DevOps, Cloud, Software, Security, Test, and IT to resolve cross-team reliability problems.
• Understand, operate, and incrementally improve systems built by other engineers with a reliability focus.
• Participate in on-call rotation for critical services with triage and escalation duties.

Skills

Linux proficiency

Observability

Incident response

Networking fundamentals

Root cause analysis

Cross-functional collaboration

Education

Bachelor's/Master's/PhD in CS/CE or related

Tools

Kubernetes

CI/CD tooling

Job description

Castelion is moving incredibly fast to develop and deliver advanced defense systems. This opportunity lets you join early, own meaningful pieces, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of Castelion.

As a Site Reliability Engineer, you will own the reliability, performance, observability, and operational health of Castelion's critical engineering systems.