Software Engineer (C#) — Internal Tooling (AI Infrastructure)

About The Role

What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a senior full-stack C# engineer to build the data pipelines, annotation systems, and evaluation tooling that leading AI labs depend on every day.

This isn't toy work or proof-of-concept territory. You'll be writing production code that sits at the heart of real AI training and evaluation workflows — the kind of systems that determine how models learn, improve, and get measured.

• Organization: Alignerr
• Type: Hourly Contract
• Location: Remote
• Commitment: 20–40 hours/week

What You'll Do

• Design and build high-performance C# systems that support large-scale AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale
• Improve reliability, performance, and correctness across existing C# codebases
• Build robust benchmarking and evaluation harnesses to measure system behavior




• Implement interoperability solutions — such as invoking Python ML models from .NET or wrapping native libraries
• Identify bottlenecks and edge cases, then ship scalable, well-reasoned fixes
• Collaborate with data, research, and engineering teams across model training and evaluation workflows
• Participate in synchronous design reviews to iterate on architecture and implementation decisions

Who You Are

• 3–5+ years of professional experience writing production-grade C#
• Strong full-stack developer with a solid systems programming foundation
• Experienced in interoperability scenarios — calling Python ML models from .NET, wrapping native libraries, bridging ecosystems
• Proven track record designing benchmarking harnesses and performance evaluation systems
• Clear, precise written and verbal communicator — you can explain technical decisions to mixed audiences
• Native or fluent English speaker
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📌 Software Engineer (México)
🏢 Alignerr
📍 México