Software Engineer (C#) - Internal Tooling

Alignerr is seeking experienced full-stack C# engineers to shape the infrastructure powering the next generation of AI. In this role, you will design, build, and optimize high-performance C# systems that support AI data pipelines and evaluation workflows, collaborating closely with data, research, and engineering teams.

Responsibilities:

• Design, build, and optimize high-performance C# systems supporting AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and safety across existing C# codebases
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Identify and resolve bottlenecks and edge cases in data and system behavior with scalable solutions
• Participate in synchronous design reviews to iterate on architecture and implementation decisions
• Build and maintain robust benchmarking and performance evaluation harnesses

Requirements:

• 3–5+ years of professional experience writing production-grade C#
• Strong full-stack developer background with solid systems programming fundamentals
• Expertise in interoperability scenarios — such as invoking Python ML models from .NET or wrapping native libraries
• Experienced designing robust harnesses for benchmarking and evaluating system performance
• Native or fluent English speaker with clear written and verbal communication skills
• Able to commit 20–40 hours per week with reliability and consistency
• Prior experience with data annotation, data quality, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems or developer tooling
• Background working with or alongside research teams in a fast-moving environment