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# Principal Engineer, Site Reliability

- **Company:** T-Mobile Us, Inc.
- **Location:** Kent, WA, United States
- **Experience:** Expert
- **Salary:** $125,300.0 - $226,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Agile Methodology, Amazon Web Services, Application Services, Bash Shell, C Sharp (Programming Language), Cloud Computing, Cloud Engineering, Continuous Integration, DevOps, HP Systems Insight Manager, Windows PowerShell, Reliability Engineering, Site Reliability Engineering Practices, Software Engineering, SQL Databases, Scripting, Google Cloud, Reliability of Systems, Kubernetes, Information Technology, Programming Languages
- **Published:** October 18, 2026
- **Apply:** https://diversityjobs.com/career/18673571/Principal-Engineer-Site-Reliability-Washington-Bellevue

## About the Role

* Bachelor's Degree and 7 years of related work experience OR a combination of education and experience deemed equivalent (Required)
 * Acceptable areas of study include Computer Science, Engineering or a related field. (Preferred)
 * 7-10 years Working in operations or develops environments (Preferred)
 * 7-10 years Troubleshooting customer related issues and managing customer relationships (Preferred)
 * 7-10 years Very adept with scripting (Bash, PowerShell, etc.), in addition to other programming languages, Java, C#, etc. SQL also a plus (Preferred)

Knowledge, Skills and Abilities:

 * Application Monitoring (Required)
 * Automation (Required)
 * CI/CD (Required)
 * Capacity Planning (Required)
 * Cloud Infrastructure (Required)
 * Incident Management (Required), * Google Cloud Certified - Professional Cloud ArchitectCertification from Google that validates the ability to design, develop, and manage a secure, scalable, and reliable cloud architecture using Google Cloud technologies. (Preferred)
 * AWS Certified DevOps EngineerCertification from Amazon Web Services that validates technical expertise in provisioning, operating, and managing distributed application systems on the AWS platform. (Preferred)
 * Certified Kubernetes Administrator (CKA)Certification that validates the skills required for day-to-day administration of Kubernetes clusters. ()

 * At least 18 years of age
 * Legally authorized to work in the United States

## Description

This role supports organizational goals by enhancing system reliability and resilience to improve software development and deployment efficiency. It involves applying site reliability engineering principles and automation to reduce manual work and prevent operational incidents. The role requires strong problem-solving and analytical skills to resolve complex technical issues effectively. Success is measured by system stability, incident reduction, and acceleration of software delivery processes. The work directly impacts the performance and reliability of the organization's digital infrastructure and customer experience. Job Responsibilities:

 * Implement site reliability engineering practices and automation tools to improve system reliability and resilience
 * Collaborate with cross-functional teams to support Agile and DevOps methodology adoption
 * Apply problem-solving and analytical skills to resolve complex technical challenges
 * Utilize advanced technologies and tools to accelerate software development and deployment
 * Engage in continuous learning to maintain technical expertise and adapt to emerging technologies
 * Reduce operational incidents by minimizing manual effort through automation and effective problem resolution
 * Also responsible for other duties/projects as assigned by business management as needed