Backend Developer - Data Annotation Systems

About the Job

Alignerr 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.

Position

Senior Python Full-Stack Engineer - AI Data & Infrastructure

Type: 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 decisions

Qualifications

Must-Have

- Native or fluent English speaker

- Full-stack developer experience with a strong systems programming background

- 3-5+ years of professional experience writing production Python.

- Experience building asynchronous task queues to handle long-running background jobs.

- Proficiency in optimizing database queries for high-read/write applications and serving data via real-time protocols (e.g., WebSockets).

- Clear written and verbal communication skills.

- 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 tooling

Application Process

- Submit your resume

- Complete a short technical screening

- Project matching and onboarding

$50 - $75 an hour