C# Infrastructure Engineer - Data Pipelines

Alignerr is looking for a senior C# engineer to design and build high-performance data pipelines and evaluation infrastructure for AI systems. The role involves optimizing existing systems, developing full-stack tooling, and collaborating with various teams to enhance model training workflows.

Responsibilities:

• Design, build, and optimize high-performance C# systems supporting AI data pipelines and model 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
• Identify bottlenecks and edge cases in data and system behavior, then implement scalable, resilient fixes
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Participate in synchronous design reviews to iterate on architecture and implementation decisions

Requirements:

• Native or fluent English speaker with clear written and verbal communication
• Full-stack developer with a strong systems programming background
• 5+ years of professional experience writing production-grade C#
• Deep experience building streaming data pipelines using asynchronous streams and reactive programming concepts
• Skilled at optimizing I/O-bound operations and implementing resilient retry policies for distributed data ingestion
• Able to commit 20–40 hours per week with reliable availability
• Prior experience with data annotation, data quality, or AI evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems architecture or developer tooling