C# Infrastructure Engineer - Data Pipelines

Alignerr Corp.; Denver (CO); Remote; USD 96,000 - 179,000; Full time

Job summary

Alignerr is seeking a Senior C# Infrastructure Engineer to design and optimize AI data pipelines and evaluation systems. This fully remote, hourly-contract role offers 20–40 hours per week and meaningful, high-impact work across production systems with data, research, and engineering teams.

You will build streaming data pipelines, develop full-stack tooling for data annotation and validation, and drive reliability and performance improvements in C#.

Qualifications

• 5+ years of professional C# experience.
• Experience building production-grade data pipelines.
• Strong written and spoken English.

Responsibilities

• Design and optimize C# systems for AI data pipelines.
• Develop tooling and backend services for data annotation and evaluation.
• Improve reliability and performance of existing C# codebases.
• Collaborate with data, research, and engineering teams.
• Identify bottlenecks and implement scalable fixes.
• Participate in design reviews and architecture decisions.

Skills

C# development

Full-stack development

Streaming data pipelines

Reactive programming

Asynchronous I/O

Distributed systems

System optimization

Job description

C# Infrastructure Engineer — AI Data Pipelines

About The Role

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

This is a fully remote, flexible contract role for an experienced engineer who wants meaningful, high-impact work — not just maintenance tickets. You'll work on real production systems alongside data, research, and engineering teams 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 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 bottlenecks and edge cases in data and system behavior — then implement scalable, production-ready fixes
• Participate in synchronous design 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
• Self-directed and reliable — able to commit 20–40 hours per week and deliver without hand-holding

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 architecture or developer tooling

Why Join Us

• Work directly with leading AI research labs on real, high-impact production systems
• Fully remote and async-friendly — work from wherever you do your best work
• Freelance autonomy with the substance of meaningful, senior-level engineering work
• Be at the frontier of AI infrastructure — the kind of work that actually matters
• Potential for ongoing contracts and expanded scope as projects grow