Landmark, a Halliburton company, builds the software and data platforms that help the global energy industry make better decisions. Our products span subsurface interpretation, well construction planning, reservoir simulation, and digital operations — tools used daily by engineers and scientists at the world’s largest energy companies. We are investing significantly in our engineering capability in Oslo, and these roles are part of building a permanent, locally-owned engineering organization to take long‑term ownership of the platform.

We are hiring experienced C# developers to build and evolve the .NET services at the core of the platform. These are backend roles on services that handle demanding, domain‑rich workloads in the energy space — services that need both ongoing feature development and the careful maintenance that keeps a production platform reliable. Parts of the codebase are written in F#, so comfort with — or a willingness to pick up — a functional style alon...