Svenska kraftnät is a key player in the energy transition. The IT division is growing to enable doubled electricity production and a fossil-free future. Using new technology, we increase both infrastructure capacity and the pace of digitalization and processes development. We seek an experienced tester with a developer background to work in an agile team to build robust and well-tested systems. Close collaboration with developers and focus on IT security prioritized. The team develops outage management systems for capacity calculation of the Swedish transmission grid, using modern technologies like C#, .NET Core, Entity Framework, Razor pages, REST, and MS-SQL. The role involves test automation, manual and exploratory testing, test data management, CI/CD integration, collaboration, test strategy improvement, and coordination.