.NET Performance Engineer- Global tech. company - UK - remote

Excellent opportunity to join a new team, owning the runtime health and throughput characteristics of the platform. This is a specialist contributor role - you won't be building feature logic, you'll be ensuring the systems that run it do so efficiently, reliably, and at scale.

Skills/experience

• AI development experience - usage of AI tools (Claude, CoPilot, ChatGPT) - highly desirable
• 4-5+ years of .NET/C# development with a demonstrable specialism in performance engineering
• Deep, hands-on experience with .NET profiling tools - dotMemory, dotTrace, PerfView, Visual Studio Diagnostic Tools, or equivalent
• Strong understanding of .NET memory management internals - GC generations, LOH, pinned objects, finalisation, and how allocation patterns affect runtime behaviour
• Experience optimising high-throughput data processing pipelines - including async/await patterns, Channel, pipelines, and avoiding synchronisation bottlenecks
• Proven ability to diagnose large dataset query performance issues across both relational (SQL) and document databases, including index analysis and query plan interpretation
• Familiarity with ETW, EventPipe, and diagnostics tooling (dotnet-trace, dotnet-counters, dotnet-dump)

Duties:

• Profile, diagnose, and resolve performance bottlenecks across .NET services - from GC pressure and memory leaks to thread contention and I/O saturation
• Own memory management strategy across long-running services - heap allocation patterns, LOH fragmentation, finaliser queues, and GC tuning (gen0/1/2, server vs. Workstation, DATAS)
• Investigate and optimise high-throughput data pipelines - batch processing, streaming patterns, buffer management, and backpressure handling
• Identify and resolve large dataset query performance issues - index utilisation, query plan analysis, pagination strategies, and aggregation efficiency across both relational and document databases
• Establish and maintain performance benchmarking infrastructure using BenchmarkDotNet and load testing tooling - define baselines, track regressions, and gate releases on performance criteria
• Conduct performance-focused code reviews - identify allocations, boxing, closure captures, LINQ misuse, and other common .NET performance anti-patterns
• Collaborate with product engineers to surface performance constraints early in design, without blocking feature delivery
• Produce clear diagnostics and findings documentation that non-specialists can act on

Excellent company, team and opportunities, apply now!

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