Alignerr is seeking a remote Senior C# Full-Stack Engineer for an hourly contract role (20–40 hours/week) to build and optimize data pipelines, annotation tooling, and evaluation systems for advanced AI systems. Candidates must be native or fluent in English, have at least 5 years of professional production-grade C# experience, and possess strong systems programming and database access skills. The role is open globally to work flexible hours from anywhere.