Senior Test Engineer

We're looking for a Senior Test Engineer to prove that a regulated energy utility's new non-persistent Azure developer desktops meet their SLA and security controls. Every phase ends in an exit gate judged against agreed targets: boot under about 1 minute, IDE cold start under about 15 seconds, source control and Copilot reachable 99% or more, and zero TLS-interception failures. You'll turn those targets into automated, repeatable tests and build the mocks and synthetic data that keep production out of the sandbox. Key Responsibilities: SLA & Performance Validation: Turn the SLA into a measurable test plan with pass/fail thresholds and own phase-gate acceptance; baseline the on-premises VDI and score AVD and Horizon on the same harness; automate logon, boot, IDE cold start, and concurrent-workload tests with Login Enterprise or LoadGen. Connectivity & Toolchain Validation: Run synthetic reachability checks for Git, Copilot, artifact repositories, and MCP endpoints through inspected egress; write NuGet, npm, pip, and Docker smoke tests that catch TLS or endpoint-agent breakage first. Security & State Validation: Run negative tests proving production is unreachable, public endpoints are denied, App Control and EPM behave as designed, and every action reaches the SIEM; prove desktops rebuild clean while repos, caches, and tooling survive. Test Data, Mocks & Containers: Build synthetic data generators, masked-subset tooling, and mock APIs (WireMock, Postman, Micro