Senior Performance Test Engineer with .Net - Grand Rapids, MI

Capgemini • Southfield, MI

2d

About The Position

We are seeking a highly skilled Performance Engineer with deep expertise in .NET application performance tuning and diagnostics. The ideal candidate will have hands-on experience with profiling, distributed tracing, and performance optimization in cloud and hybrid environments.

Requirements

• 7+ years building/supporting .NET applications (.NET Framework and .NET 6/7/8).
• Strong knowledge of CLR internals, GC modes, thread pool behavior, JIT, and async/await execution.
• Hands-on experience with Azure Performance Profiling, Azure Monitor, Application Insights, and cloud-hosted performance considerations.
• Proficiency with APM/observability tools such as Dynatrace, Datadog, Grafana, or similar.
• Familiarity with distributed tracing (e.g., OpenTelemetry) and multi-service trace interpretation.

Responsibilities

• Diagnose and resolve performance issues across .NET applications in cloud, on-prem, and hybrid environments using profiling, tracing, and telemetry tools.
• Design and execute performance tests (load, stress, soak) to validate service-level expectations for latency, throughput, and resource utilization.
• Analyze distributed traces and telemetry to identify bottlenecks across APIs, caches, messaging, and data layers; provide actionable recommendations.
• Collaborate with development teams to optimize algorithmic efficiency, concurrency patterns, and resource usage; mentor teams on performance-aware development.
• Build dashboards and alerts using APM/observability tools (Dynatrace, Datadog, Grafana) to monitor KPIs and detect regressions early.

Benefits

• Paid time off based on employee grade (A-F), defined by policy: Vacation: 12-25 days, depending on grade, Company paid holidays, Personal Days, Sick Leave
• Medical, dental, and vision coverage (or provincial healthcare coordination in Canada)
• Retirement savings plans (e.g., 401(k) in the U.S., RRSP in Canada)
• Life and disability insurance
• Employee assistance programs
• Other benefits as provided by local policy and eligibility

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 5,001-10,000 employees