Senior Performance Test Engineer

## DescriptionTIAG is now hiring a **Senior SDET / Performance Engineer** to join our team supporting high-impact public service systems for King County. In this role, you will take end-to-end ownership of the performance engineering lifecycle, primarily focusing on the **Property Tax Administration System (PTAS)** while providing shared expert support for critical county infrastructure, including the **2026 Mid-Term Elections** and **Metro transit systems**. This position is onsite in Seattle, WA up to 2 days per week with additional onsite requirements throughout the month.The ideal candidate is a technical authority in load orchestration and bottleneck analysis, capable of simulating extreme concurrency (250,000+ users) and navigating complex Azure/F5 environments. You will be empowered to design realistic, secure, and repeatable large-scale tests that ensure citizen-facing services remain reliable under peak demand.Positions Responsibilities include:* Lead Performance Engineering: Manage the end-to-end performance testing process, establishing baselines and leading system capacity testing under peak loads.* Architect Realistic Simulations: Design and execute high-scale orchestration, including the technical approach for bypassing MFA in automated, non-production environments under IAM guardrails.* Analyze Cross-Layer Bottlenecks: Diagnose performance issues across the full stack, including application/API, Dataverse/OData, backend SQL, F5 load balancers (VIPs/pools/iRules), and Azure infrastructure.* Integrate CI/CD: Build and maintain automated load/stress tests within CI/CD pipelines to provide real-time visibility into performance trends across builds.* Deliver Actionable Intelligence: Produce management-ready Root Cause Analysis (RCA) reports, remediation tracking, and readiness sign-offs for go/no-go decisions.* Collaborate Across Teams: Coordinate with Network, CloudOps, Security, and application teams to schedule change windows and execute controlled peak-load rehearsals.* Knowledge Management: Maintain evergreen runbooks and playbooks for operations and incident response within the County repository.## QualificationsRequired Skills and Qualifications* 8+ years of professional experience in Software Engineering with a focus on deep Web Architecture, including HTTP/HTTPS, RESTful APIs, WebSockets, and DNS/CDN/Load Balancing.* 8+ years of hands-on scripting and programming experience in C#, Python, or JavaScript, including proficiency in Shell scripting and regular expressions.* 5+ years of mastery in Performance Testing tools, specifically Apache JMeter, Azure Test Cloud, and StressStimulus/BlazeMeter.* 5+ years of experience integrating performance tests into CI/CD pipelines (e.g., Azure DevOps, GitHub Actions, or Jenkins) and working with containerization (Docker/Kubernetes).* 5+ years of experience with APM and monitoring tools such as Grafana, Prometheus, New Relic, or Dynatrace, and log analysis (ELK stack).* Proven ability to model complex ramp profiles and manage large-scale data parameterization/correlation.* Availability for occasional after-hours testing (typically 8:00 PM – 10:00 PM PT) as required by system maintenance windows (total hours remain 40/week).Preferred Qualifications* Experience with Microsoft Power Platform/Dataverse: Specifically validating Dataverse/OData API and backend performance.* Public Sector Experience: Familiarity with government-scale systems such as Election result reporting or transit operational workflows (Metro Yard Management).* Advanced Infrastructure Knowledge: Hands-on experience tuning F5 load balancer configurations and Azure autoscale quotas.* Security Mindset: Experience provisioning non-prod test identities and working within strict IAM-approved security guardrails.* Analytical Rigor: Ability to translate complex technical bottlenecks into \"management-ready\" findings and remediation plans.TIAG is an equal opportunity employer and federal contractor or subcontractor. Consequently, the parties agree that, as applicable, they will abide by the requirements of 41 CFR 60-1.4(a), 41 CFR 60-300.5(a), and 41 CFR 60-741.5(a) and employment decisions shall be based solely on merit and without regard disability, or protected veteran status, or any other characteristic protected by local, state, or federal laws, rules, or regulations. TIAG takes proactive steps to employ and advance in employment qualified individuals without regard to disability or protected veteran status. The parties also agree that, as applicable, they will abide by the requirements and may be subject and required to take action pursuant to the following laws and accompanying regulations:The Vietnam Era Veterans Readjustment Assistance Act of 1974, as amended (and its implementing regulations at 41 C.F.R. 60-300); Section 503 of the Rehabilitation Act of 1973, as amended (and its implementing regulations at 41 C.F.R 60-741); and Executive Order 13496 (and its implementing regulations at 29 C.F.R. part 471, Appendix A to Subpart A). #J-18808-Ljbffr