C# Infrastructure Engineer - Data Pipelines

Alignerr Corp.; New York (NY); Remote; USD 96,000 - 165,000; Part time

Job summary

Alignerr is seeking a Senior C# Infrastructure Engineer to design and build data pipelines, annotation tooling, and evaluation systems powering AI training. This fully remote hourly contract role offers 20–40 hours per week and a chance to impact production AI systems.

You will develop high‑performance C# systems, tackle data ingestion challenges, and collaborate with cross‑functional teams to support model training and evaluation workflows.

Qualifications

• 5+ years of professional experience writing production‑grade C#.
• Experience building streaming data pipelines with asynchronous streams and reactive programming.

Responsibilities

• Design, build, and optimize high‑performance C# systems powering 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 resilience across existing C# codebases.
• Identify bottlenecks and edge cases in data and system behavior, and implement scalable fixes.
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows.
• Participate in synchronous design and code reviews to iterate on system architecture and implementation decisions.

Skills

C# development

Streaming data

Async programming

Distributed systems

Performance optimization

Code reviews

Tools

Azure

Job description

C# Infrastructure Engineer — Data Pipelines (AI Training)

About The Role

What if your C# expertise could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C# Full-Stack Engineer to design and build the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next‑generation models.

This is a fully remote contract role working on real production systems — high‑impact, technically challenging, and at the frontier of AI development.

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

What You'll Do

• Design, build, and optimize high-performance C# systems that power 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 resilience across existing C# codebases
• Identify bottlenecks and edge cases in data and system behavior, and implement scalable fixes
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Participate in synchronous design and code reviews to iterate on system architecture and implementation decisions

Who You Are

• Native or fluent English speaker with clear written and verbal communication skills
• 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 consistently

Nice to Have

• Prior experience with data annotation, data quality, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems, developer tooling, or infrastructure engineering

Why Join Us

• Work directly with leading AI labs on production systems that matter
• Fully remote and flexible — work from wherever you do your best engineering
• Freelance autonomy with the structure of meaningful, technically demanding projects
• Contribute to cutting‑edge AI infrastructure at a moment when it counts
• Potential for ongoing work and contract extension as new projects launch