Principal Python Engineer - ML Infrastructure
About The JobAlignerr connects top technical experts with leading AI labs to build, evaluate, and improve next-generation models. We work on real production systems and high-impact research workflows across data, tooling, and infrastructure.PositionSenior Python Full-Stack Engineer — AI Data & InfrastructureType: Contract, Remote Commitment: 20–40 hours/week Compensation: Competitive, hourly (based on experience)Role Responsibilities Design, build, and optimize high-performance systems in Python 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 Python 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, and implement scalable fixes Participate in synchronous reviews to iterate on system design and implementation decisionsQualificationsMust-Have Native or fluent English speaker Full-stack developer experience with a strong systems programming background 5+ years of professional experience writing production Python, specifically for large-scale infrastructure or platform engineering. Expertise in designing distributed computing systems and managing concurrency with advanced asynchronous patterns. Deep understanding of Python internals (GIL limitations, memory profiling) and experience optimizing performance for compute-heavy workloads. Clear written and verbal communication skills for driving technical strategy and architectural decisions. Ability to commit 20–40 hours per week.Preferred 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 toolingApplication Process Submit your resume Complete a short technical screening Project matching and onboarding